Java program to demonstrate Exception handling

Exceptions handling is the key in Java, that handle run time errors and indicate a calling method whenever an abnormal condition occurred.

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class SimpleExceptionHandling {   

 public static void main(String args[]){     

   try{         

    BufferedReader br = new BufferedReader(new FileReader("xyz"));       
//Buffered reader is a class that reads text from a character-input stream. 
//Here we are creating Buffered reader which generally read request made of a Reader. 
  
    String s = br.readLine();        
//This method read each line of the text and buffer request is stored in the string s.
   System.out.println(s);      
  } 
      catch(FileNotFoundException fne) 
       {
        System.out.println("File not found.");   
//This is the Exception message which is to be displayed if the particular file is not found.
      }
    }
  }

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Sample code to access Oracle DB

Using this sample code you can access the Oracle DB. This can be very easily modified to suit your own project/application.

import java.io.*;
import java.util.*;
import java.sql.DriverManager;
import java.sql.* ;

public class ReadFromDb
{
 public static Connection gConnection;
 public static Connection uConnection;

 public static void main(String args[])
    {
        // Driver Name or Type
        // URL Name
        // DB userid Name
        // DB password Name
        String cDriverName = "oracle.jdbc.driver.OracleDriver";
  String url = "jdbc:oracle:thin:oplus_app/oplus_app@obsdevdb.qintra.com:1528:uordps00";
  String userid = "oplus_app";
  String password = "oplus_app";

  try
  {
   Class.forName(cDriverName);
      gConnection = DriverManager.getConnection(url, userid, password);
  }
        catch(Exception e)
  {
   System.err.print("Exception1: ");
   System.err.println(e.getMessage());
  }
  try
  {
   Class.forName(cDriverName);
      uConnection = DriverManager.getConnection(url, userid, password);
  }
        catch(Exception e)
  {
   System.err.print("Exception2: ");
   System.err.println(e.getMessage());
  }

        ReadFromDb objGet = new ReadFromDb();
        try
        {
   objGet.getOrder();
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
        }
    }

   // Method where the implementation is there.
   void getOrder() throws Exception
 {
  ResultSet sResult = null;
  String order_number = "C 11820407";
  PreparedStatement ps = null;

  try
  {
   Statement sStatement = gConnection.createStatement();

   // Query. Every project can use their own.
   String sQuery1 = "SELECT ORDER_CONTEXT_ID,DESTINATION_SYSTEM,ORDER_STATUS,IS_ORDER_VALID,CUID,XML_ORDER FROM ORDER_PDS_XML "
                                + " WHERE ORDER_NUMBER = '" + order_number + "'" ;

   System.out.println("\n"+sQuery1);

            sResult = sStatement.executeQuery(sQuery1);

   if (sResult != null)
   {
    while(sResult.next())
    {
     String oci = sResult.getString("ORDER_CONTEXT_ID");
     System.out.println("\nORDER_CONTEXT_ID : " + oci);

     String sQuery2 = "UPDATE ORDER_PDS_XML SET REGION = 'NWB', MARKET_SEGMENT=1"
                                     + " WHERE ORDER_CONTEXT_ID = '" + oci + "'" ;

     System.out.println("\n"+sQuery2);
     ps = uConnection.prepareStatement(sQuery2);
     ps.executeUpdate();
    }
   }

   if(sStatement != null)
   {
    sStatement.close();
    sStatement = null;
   }
   if(sResult != null)
   {
    sResult.close();
    sResult = null;
   }
   if (ps != null)
   {
    ps.close();
   }
   if (uConnection != null)
   {
    uConnection.close();
   }
   if (gConnection != null)
   {
    gConnection.close();
   }
  }
  catch (SQLException ex)
  {
   ex.printStackTrace();
  }

 }

}

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Thread implementation with with synchronized method

Sample code for Thread implementation with with synchronized method

import java.util.ArrayList;
import java.util.List;


public class ThreadTest {

 public static List registryList= new ArrayList();
 public static void main(String args[]){
  
  RegistryBean obj1= new RegistryBean(1,false);
  RegistryBean obj2= new RegistryBean(2,false);
  RegistryBean obj3= new RegistryBean(3,false);
  RegistryBean obj4= new RegistryBean(4,false);
  RegistryBean obj5= new RegistryBean(5,false);
  registryList.add(obj1);
  registryList.add(obj2);
  registryList.add(obj3);
  registryList.add(obj4);
  registryList.add(obj5);
  
  
  SignupProcessThread thread1=new SignupProcessThread();
  SignupProcessThread thread2=new SignupProcessThread();
  SignupProcessThread thread3=new SignupProcessThread();
  SignupProcessThread thread4=new SignupProcessThread();
  SignupProcessThread thread5=new SignupProcessThread();
  
  thread1.start();
  thread2.start();
  thread3.start();
  thread4.start();
  thread5.start();
 }
 
 public static synchronized RegistryBean getRegistryRequest(String name){
  
  for(int i=0;i<registryList.size();i++){
   if(!((RegistryBean)registryList.get(i)).isStatus()){
    System.out.println(name+" : thread name Got the object " +
      "with reg num : "+((RegistryBean)registryList.get(i)).getRegNo()+" " +
        "and Status : "+((RegistryBean)registryList.get(i)).isStatus());
    
    for(int j=0;j<50000;j++){}
    
    ((RegistryBean)registryList.get(i)).setStatus(true);
    return  (RegistryBean)registryList.get(i);
   }   
  }
  return null;
 }
}

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Simple Interest Calculator Java Applet

A sample interest calculator, very basic in functionality, coded in Java and ready to be compiled and executed as a Java Applet.

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.text.NumberFormat;

public class InterestCalculator extends Applet implements ActionListener 

       TextField textPresentVal = new TextField("0", 10);
       TextField textInterestRate = new TextField("0", 10);
        TextField textPeriods = new TextField("0", 10);
        Label lblPresentVal = new Label("Present Value");
        Label lblInterestRate = new Label("Interest Rate");
        Label lblPeriods = new Label("Number of Periods");
        Label lblFutureVal = new Label("Future Value:");
        Button btnOk = new Button("Calculate");
 
        public void init()
        {
 
                add(lblPresentVal);
                add(textPresentVal);
                add(lblInterestRate);
                add(textInterestRate);
                add(lblPeriods);
                add(textPeriods);
                add(lblFutureVal);
                add(btnOk);
 
                btnOk.addActionListener(this);
        }
 
        public void actionPerformed(ActionEvent evt)  
        {
            if (evt.getSource() == btnOk)
            {
                int PresentVal = Integer.parseInt(textPresentVal.getText());
                int InterestRate = Integer.parseInt(textInterestRate.getText());
                int Periods = Integer.parseInt(textPeriods.getText());
                double FutureVal = PresentVal * (Math.pow((1 + InterestRate), Periods));
                NumberFormat nf = NumberFormat.getCurrencyInstance();
                lblTotal.setText("Future Value: " + nf.format(FutureVal));
 
                repaint();
            }
        }
} 

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QR code generator

It is just a simplified version of ZXing API

GenerateQR.generateQR(String, new File(Path.extension),int width,int height);

e.g.

GenerateQR.generateQR(myString, new File("abc.png"), width, height);

import java.io.File;

import pkg.GenerateQR;

public class SimpleQR {

 /**
  * @param args
  */
 public static void main(String[] args) {
  
  GenerateQR.generateQR("My QR code", new File("C:/a.png"), 100, 100);
 }

}

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Reading filenames with specific extensions from a folder and writing into excel

This utlity program reads the names of all files in a folder and generate a report enlisting filenames based on selected file extensions only via java program. This standalone program extracts names of files with .doc extension. The program can be customized to enable export of filenames into an excel. all file names or files with .xls or .pdf extension can be enlisted in an excel.

1. Add the JXl.jar file to the classpath of the project.

2. Add the java file in a project(change pachakge name in applicable)

3. Change the source folder location and if required, name of the excel file to be generated.

4. Run the GetFolderContent.java file

Excel file will be generated in the corresponding project folder.

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import jxl.Workbook;
import jxl.WorkbookSettings;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;

public class GetFolderContent {

 private static String excelFileName = "FileList.xls";
 private static String targetexcelFilepath = "C:\backup\test\Test_Work";  // generated excel file location
 private static String sourceFolderPath = "C:\DUK-CC"; // source Directory
 private static int totalFileCount = 0; // variable to store total file count
 private static int fileCount = 0; // variable to store required files count
 private static ArrayList<String> aList = new ArrayList<String>();

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  // to get file names
  File folder = new File(sourceFolderPath);
  File[] listOfFilesInDirectory = folder.listFiles();
  try {
   for (int numberOfFilesInFolder = 0; numberOfFilesInFolder < listOfFilesInDirectory.length; numberOfFilesInFolder++) {

    if (listOfFilesInDirectory[numberOfFilesInFolder].isFile()) {
     totalFileCount++;
     String files = listOfFilesInDirectory[numberOfFilesInFolder]
       .getName();
     if (files.endsWith(".doc") || files.endsWith(".DOC")
       || files.endsWith(".DOCX")
       || files.endsWith(".docx")) {
      aList.add(files);
      fileCount++;
     }
    }
   }
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  System.out.println("Total file count = " + totalFileCount);
  System.out.println("Required file count = " + fileCount);

  createExcelFileAndGetContent();
 }

 // code to generate an excel file
 public static void createExcelFileAndGetContent() {

  File file = new File(excelFileName);

  try {
   WorkbookSettings wbSettings = new WorkbookSettings();
   WritableWorkbook workbook = Workbook.createWorkbook(file,
     wbSettings);
   workbook.createSheet("File Names", 0);
   System.out.println("excel File is created in path -- "
     + targetexcelFilepath+ "n*********Items in directory:**********" );
   WritableSheet excelSheet = (WritableSheet) workbook.getSheet(0);
   if (!aList.isEmpty()) {
    for (int rowNumber = 0; rowNumber < aList.size(); rowNumber++) {
     System.out.println(aList.get(rowNumber));
     Label label = new Label(1, rowNumber, (String) aList.get(rowNumber));
     excelSheet.addCell(label);
    }
   } else {
    System.out.println("No matching files found");
   }
   workbook.write();
   workbook.close();
  } catch (RowsExceededException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IndexOutOfBoundsException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (WriteException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }

}

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Using filters in Java

public void doFilter(ServletRequest req,ServletResponse resp,FilterChain chain){
    try{
 HttpSession session = ((HttpServletRequest)req).getSession(false);
 if(session!=null){
            String userName = (String) session.getAttribute("userid");
            if(userName==null || userName.equals("")){
                   //Invalid user. Redirect to login page
 String message= "You have been logged out of the application. Please log in again.";
  session.setAttribute("message", message);
  ((HttpServletResponse)resp).sendRedirect(((HttpServletRequest)req).getContextPath()+session.getServletContext().getInitParameter("initPage"));
  }
  else{
                                                //If valid user, forward the request
   chain.doFilter(req, resp); 
  }
 }
 else{
  ((HttpServletResponse)resp).sendRedirect("errorPage.html");  }
 }
catch(ServletException se){
  System.out.println("In Servlet Exception");
  try{
   throw se.getRootCause();
  }
  catch(Throwable e){
   e.printStackTrace();
  }
   se.printStackTrace();
   
  }
  catch(IOException ioe){
   System.out.println("In IO Exception");
   ioe.printStackTrace();
   
  }
  
   
 }

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Base64 encoding and decoding in Java

So today I found myself needing to test base64 encoding in Java so I could compare the same results on the RPG end. Being that it took me longer than necessary to put the code together I thought I would post it online. Note this code is compiled using JDK 1.5 (aka 5.0).

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.xerces.impl.dv.util.Base64;

public class Base64CopyToFrom {

    public static void main(String args[]) {

     base64EncodeFile("c:/temp/newimage.tif", "c:/temp/newimage_base64encoded.txt");
     base64DecodeFile("c:/temp/newimage_base64encoded.txt", "c:/temp/newimage_1.tif");

    }

    static void base64EncodeFile(String fileToEncode, String resultingFile){
        InputStream is = null;
        OutputStream os = null;

        try {
            is = new FileInputStream(fileToEncode);
            os = new FileOutputStream(resultingFile);
            int bytesRead = 0;
            int chunkSize = 10000000;
            byte[] chunk = new byte[chunkSize];
            while ((bytesRead = is.read(chunk)) > 0) {
                byte[] ba = new byte[bytesRead];

                for(int i=0; i
                    ba[i] = chunk[i];
                }

                String encStr = Base64.encode(ba);
                os.write(encStr.getBytes(), 0, encStr.length());
            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    static void base64DecodeFile(String fileToDecode, String resultingFile){
        InputStream is = null;
        OutputStream os = null;

        try {
            is = new FileInputStream(fileToDecode);
            os = new FileOutputStream(resultingFile);
            int bytesRead = 0;
            int chunkSize = 10000000;
            byte[] chunk = new byte[chunkSize];
            while ((bytesRead = is.read(chunk)) > 0) {
                byte[] ba = new byte[bytesRead];

                for(int i=0; i
                    ba[i] = chunk[i];
                }

                ba = Base64.decode(new String(ba));
                os.write(ba, 0, ba.length);
            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}

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Creating Custom Pie Chart in Java

This asset creates a pie for the data given. The pie chart depicts the no: of Jobs in each status. Each job is coloured specifically based on its status and the area of the sector is proportional to no. of jobs in particular status.

 import java.awt.Color;
import java.awt.Font;
import java.io.File;
import java.io.IOException;

import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.ui.RectangleInsets;


public class Sample {
 
 public static void main(String args[]){

  DefaultPieDataset pieDataset = new DefaultPieDataset();
  pieDataset.setValue("SUCCESS", new Integer(5));
  pieDataset.setValue("FAILED", new Integer(1));
  pieDataset.setValue("RUNNING", new Integer(2));
  pieDataset.setValue("NOT_STARTED", new Integer(4));
  pieDataset.setValue("HANGING", new Integer(3));
    
  final PiePlot jobStatusPlot = new PiePlot(pieDataset);
  Font font=new Font("Arial Bold", 5, 11);
  jobStatusPlot.setLabelBackgroundPaint(Color.PINK);
  jobStatusPlot.setLabelPaint(Color.BLACK);
  
  jobStatusPlot.setLabelFont(font);
  RectangleInsets padding=new RectangleInsets(3, 10, 5, 10);
  jobStatusPlot.setLabelPadding(padding);
 
  jobStatusPlot.setSectionPaint("SUCCESS", Color.GREEN);
  jobStatusPlot.setSectionPaint("FAILED", Color.RED);
  jobStatusPlot.setSectionPaint("RUNNING", Color.ORANGE);
  jobStatusPlot.setSectionPaint("NOT_STARTED", Color.YELLOW);
  jobStatusPlot.setSectionPaint("HANGING", Color.RED);
  
  JFreeChart chart = new JFreeChart("Job Status Chart", JFreeChart.DEFAULT_TITLE_FONT, jobStatusPlot, true);
  chart.setBackgroundPaint(java.awt.Color.white);
  
  try {
   final ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
   final File pieChartImage = new File(JobStatusConstants.CHART_PATH);
   ChartUtilities.saveChartAsPNG(pieChartImage, chart, 500, 500, info);
   
  } catch (IOException e) {
   System.out.println(e.toString());
  }
 }
}

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Running the server on multiple ports

Running the server on multiple ports.Server will be used to access with multiple URLs with different ports.

Go to server , open command prompt and give below lines

java -cp     JAR(Path where it is stored in system ) com.codegoogle.tcpmon.MainWindow

After this awindow will appear give the ip address of your system and the port on which you want to run your server.

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Generate Combinations of Words separated by a delimiter

This solution generates different combinations of words separated by a delimiter.

If input is provided as Word1,Word2,Word3 and delimiter is provided as , then output will be

Word1

Word2

Word3

Word1,Word2

Word1,Word3

Word2,Word3

Word1,Word2,Word3

import java.util.StringTokenizer;

public class WordPermutation {  
  
    String input;   //input String
    StringBuffer output;  //Holds the output
    String delimiter = ","; //Delimiter (default comma (,))
    String arrayOfWords[];
    
    /*
     * Generates combinations by applying the 
     * concept of recursion
     */
    private void nextCombination(int position, int remainder) 
    {     
        output.append(arrayOfWords[position]+this.delimiter);  
        
        if (remainder == 1) {       
          System.out.println(output.substring(0,output.length()-1));           
        } else {       
          for (int i = position + 1; i + remainder - 1 <= arrayOfWords.length; i++)         
            nextCombination(i, remainder - 1);     
        }
        
        output.delete(output.indexOf(arrayOfWords[position]),output.length());
    }    
    
    public void generateCombinations(String input, String delimiter) 
    {     
          output = new StringBuffer();           
          this.input = input;  
          this.delimiter = delimiter;
          
          /*
           * Splitting the words by delimiter and storing in 
           * an array.
           */
          StringTokenizer buf = new StringTokenizer(input,delimiter);
          
          int lengthOfArray = buf.countTokens();
          arrayOfWords = new String[lengthOfArray];
          
          int i = 0;
          
          while(buf.hasMoreTokens())
          {
             arrayOfWords[i] = buf.nextToken();
             i++;
          }
          
          for (int j = 1; j <= lengthOfArray; j++)       
              for (int k = 0; k + j <= lengthOfArray; k++)
              {
                  nextCombination(k, j);                     
              }
    } 
    
    public void generateCombinations(String input) 
    {
        generateCombinations(input, this.delimiter);
    }
  
    /** 
     * @param args 
     */  
    public static void main(String[] args) {  
        new WordPermutation().generateCombinations("SR$WB","$");
  
    }  
}

[ Read More ]

Converting POJO to XML Element using JAXB Application

In developing SOA applications, it is necessary that you have tools in converting Java objects to XML and vice-versa. In Oracle Human Task Services for example, the task payloads are represented as XML elements, and if there's a need to manipulate those payload then, I believe that its better to do the manipulation on a Java instance equivalent, rather than navigating to the complex tree structure of the XML payload. With the Java instance, you could take advantage of Java's vast frameworks and utilities.

--------------------------------------------------------------------------------

In this post, I will demonstrate how to convert POJO's to XML and vice-versa using Java Architecture for XML Binding (JAXB), and will give some tips in annotating our entities to avoid some common gotchas.

To be able to convert your POJO to XML, it is mandatory that you put an "@XmlRootElement" annotation to your target classes.

To be able to convert your POJO to XML, it is mandatory that you put an "@XmlRootElement" annotation to your target classes.

package soadev.jaxbsample.model;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "job")
@XmlAccessorType(XmlAccessType.FIELD)
public class Job{
    private String jobId;
    private String jobTitle;
    private Long maxSalary;
    private Long minSalary;
    //getters and setters

The root name "job" above will be the root of the generated XML as follows:

<job>
   <jobid></jobid>
   <jobtitle></jobtitle>
   <maxsalary></maxsalary>
   <minsalary></minsalary>
</job>

The "@XmlAccessorType(XmlAccessType.FIELD)" annotation tells JAXB that only the fields will be marshalled to XML. There are other types which you can read from the links near the end of this post. I am more inclined to use this annotation particularly because our entities persistence annotations are also on the fields, and that we have a lot of transient methods like "computeTotal" which value I don't need to be marshalled.

I will also recommend that you removed any unnecessary associations (some auto-generated by JDeveloper when creating entities from database tables)like for example departmentList in the Employee class (mapped by the manager in Departments). Those associations will add too much complexity especially if you are already starting to expose your EJB session beans as Web Services or as EJB Service. When you cannot remove it due to some usage requirement then put "@XmlTransient" annotation if those associations are not necessary to be marshalled to XML.

If you have fields of type "java.sql.Timestamp", create a TimeStampAdapter class as follows:  

package soadev.jaxb.adapters;

import java.sql.Timestamp;
import java.util.Date;
import javax.xml.bind.annotation.adapters.XmlAdapter;

public class TimestampAdapter extends XmlAdapter {

    public Date marshal(Timestamp value) {
        if(value == null){
            return null;
        }
        return new Date(value.getTime());
    }

    public Timestamp unmarshal(Date value) {
        if (value == null){
            return null;
        }
        return new Timestamp(value.getTime());
    }
}

...and annotate your approriate fields as follows:

@XmlJavaTypeAdapter(value = TimestampAdapter.class)

private Timestamp hireDate;

This annotation can also be put inside a "package-info.java". Please see the links for details.

The runner class

The class below shows how to convert POJO to XML. It also contains a sample on how to convert to POJO an XML element with a different root name.

package soadev.jaxbsample.clients;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import oracle.bpel.services.common.util.XMLUtil;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import soadev.jaxbsample.model.Department;
import soadev.jaxbsample.model.Employee;
import soadev.jaxbsample.model.Job;

public class SimpleJaxbClient {
    public static void main(String[] args) {
        SimpleJaxbClient client = new SimpleJaxbClient();
        try {
            client.testMarshallUnmarshallSimplePojoWithSameRootQName();
            client.testMarshallUnmarshallComplexPojoWithSameRootQName();
            client.testUnmarshallComplexXmlWithDifferentRootQName();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void testMarshallUnmarshallSimplePojoWithSameRootQName() throws Exception {
        System.out.println("----Start testMarshallUnmarshallSimplePojoWithSameRootQName----");
        JAXBContext context = JAXBContext.newInstance(Job.class);
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        System.out.println("Instantiating simple pojo...");
        Job job = new Job();
        job.setJobId("SOADEV");
        job.setJobTitle("SOA Developer");
        job.setMaxSalary(10000L);
        job.setMinSalary(8000L);
        System.out.println("Simple pojo created: " + job);
        System.out.println("Marshalling pojo to a DOM Node...");
        DocumentBuilder docBuilder =
            DocumentBuilderFactory.newInstance().newDocumentBuilder();
        Document document = docBuilder.newDocument();
        marshaller.marshal(job, document);
        Element jobElement = document.getDocumentElement();
        System.out.println("Job element created: " + jobElement);
        System.out.println(XMLUtil.toString(jobElement));
        System.out.println("Unmarshalling an xml element to a POJO");
        Unmarshaller unmarshaller = context.createUnmarshaller();
        Job jobPojoFromXml = (Job)unmarshaller.unmarshal(jobElement);
        System.out.println("Simple pojo from xml created :" + jobPojoFromXml);
        System.out.println(jobPojoFromXml);
        System.out.println(jobPojoFromXml.getJobTitle());
        System.out.println(jobPojoFromXml.getJobId());
        System.out.println("----End testMarshallUnmarshallSimplePojoWithSameRootQName----");
    }
    
    public void testMarshallUnmarshallComplexPojoWithSameRootQName()throws Exception{
        System.out.println("----Start testMarshallUnmarshallComplexPojoWithSameRootQName----");
        JAXBContext context = JAXBContext.newInstance(Employee.class);
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        System.out.println("Instantiating complex pojo...");
        Employee employee = new Employee();
        employee.setEmployeeId(1L);
        employee.setFirstName("Rommel");
        employee.setLastName("Pino");
        Job job = new Job();
        job.setJobId("SOADEV");
        job.setJobTitle("SOA Developer");
        job.setMaxSalary(10000L);
        job.setMinSalary(5000L);
        employee.setJob(job);
        Department department = new Department();
        department.setDepartmentName("Java Team");
        employee.setDepartment(department);
        System.out.println("Complex pojo created: " + employee);
        System.out.println("Marshalling complex pojo to a DOM Node...");
        DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        Document document = docBuilder.newDocument();
        marshaller.marshal(employee, document);
        Element employeeElement = document.getDocumentElement();
        System.out.println("Employee element created: "+ employeeElement);
        System.out.println(XMLUtil.toString(employeeElement));
        System.out.println("Unmarshalling an xml element to a POJO");
        Unmarshaller unmarshaller = context.createUnmarshaller();
        Employee employeePojoFromXml = (Employee)unmarshaller.unmarshal(employeeElement);
        System.out.println("Complex pojo from xml created :" + employeePojoFromXml);
        System.out.println(employeePojoFromXml);
        System.out.println(employeePojoFromXml.getEmployeeId());
        System.out.println(employeePojoFromXml.getFirstName());
        System.out.println(employeePojoFromXml.getLastName());
        System.out.println(employeePojoFromXml.getJob());
        System.out.println(employeePojoFromXml.getJob().getJobTitle());
        System.out.println(employeePojoFromXml.getDepartment());
        System.out.println(employeePojoFromXml.getDepartment().getDepartmentName());
        System.out.println("----End testMarshallUnmarshallComplexPojoWithSameRootQName----");
    }
    
    public void testUnmarshallComplexXmlWithDifferentRootQName()throws Exception{
        System.out.println("----Start testUnmarshallComplexXmlWithDifferentRootQName----");
        //root is 'employeeVariable' instead of 'employee'
        String xmlString = 
            "<employeeVariable>" + 
            "  <employeeId>1</employeeId>" + 
            "  <firstName>Rommel</firstName>" + 
            "  <lastName>Pino</lastName>" + 
            "  <job>" + 
            "    <jobId>SOADEV</jobId>" + 
            "    <jobTitle>SOA Developer</jobTitle>" + 
            "    <maxSalary>10000</maxSalary>" + 
            "    <minSalary>5000</minSalary>" + 
            "  </job>" + 
            "  <department>" +
            "    <departmentName>Java Team</departmentName>" +
            "  </department>" +         
            "</employeeVariable>";
        InputStream is = new ByteArrayInputStream(xmlString.getBytes());
        DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        Document document = docBuilder.parse(is);
        Element varElement = document.getDocumentElement();
        JAXBContext context = JAXBContext.newInstance(Employee.class);
        Unmarshaller unmarshaller = context.createUnmarshaller();
        JAXBElement<Employee> employeeJaxbElement = unmarshaller.unmarshal(varElement, Employee.class);
        System.out.println("Element variable is :" + employeeJaxbElement.getName());
        Employee employeePojoFromXml = employeeJaxbElement.getValue();
        System.out.println("Complex pojo from xml created :" + employeePojoFromXml);
        System.out.println(employeePojoFromXml);
        System.out.println(employeePojoFromXml.getEmployeeId());
        System.out.println(employeePojoFromXml.getFirstName());
        System.out.println(employeePojoFromXml.getLastName());
        System.out.println(employeePojoFromXml.getJob());
        System.out.println(employeePojoFromXml.getJob().getJobTitle());
        System.out.println(employeePojoFromXml.getDepartment());
        System.out.println(employeePojoFromXml.getDepartment().getDepartmentName());
        System.out.println("----End testUnmarshallComplexXmlWithDifferentRootQName----");
    }    
}

Run Outpout

C:\Oracle\11g\jdk160_24\bin\javaw.exe -client -classpath ...

----Start testMarshallUnmarshallSimplePojoWithSameRootQName----

Instantiating simple pojo...

Simple pojo created: soadev.jaxbsample.model.Job@a6d51e

Marshalling pojo to a DOM Node...

Job element created: oracle.xml.parser.v2.XMLElement@9f5011

<job>

<jobId>SOADEV</jobId>

<jobTitle>SOA Developer</jobTitle>

<maxSalary>10000</maxSalary>

<minSalary>8000</minSalary>

</job>

Unmarshalling an xml element to a POJO

Simple pojo from xml created :soadev.jaxbsample.model.Job@c62c8

soadev.jaxbsample.model.Job@c62c8

SOA Developer

SOADEV

----End testMarshallUnmarshallSimplePojoWithSameRootQName----

----Start testMarshallUnmarshallComplexPojoWithSameRootQName----

Instantiating complex pojo...

Complex pojo created: soadev.jaxbsample.model.Employee@76fba0

Marshalling complex pojo to a DOM Node...

Employee element created: oracle.xml.parser.v2.XMLElement@949f69

<employee>

<department>

<departmentName>Java Team</departmentName>

</department>

<employeeId>1</employeeId>

<firstName>Rommel</firstName>

<lastName>Pino</lastName>

<job>

<jobId>SOADEV</jobId>

<jobTitle>SOA Developer</jobTitle>

<maxSalary>10000</maxSalary>

<minSalary>5000</minSalary>

</job>

</employee>

Unmarshalling an xml element to a POJO

Complex pojo from xml created :soadev.jaxbsample.model.Employee@82764b

soadev.jaxbsample.model.Employee@82764b

1

Rommel

Pino

soadev.jaxbsample.model.Job@12452e8

SOA Developer

soadev.jaxbsample.model.Department@1bf3d87

Java Team

----End testMarshallUnmarshallComplexPojoWithSameRootQName----

----Start testUnmarshallComplexXmlWithDifferentRootQName----

Element variable is :employeeVariable

Complex pojo from xml created :soadev.jaxbsample.model.Employee@42552c

soadev.jaxbsample.model.Employee@42552c

1

Rommel

Pino

soadev.jaxbsample.model.Job@e5bbd6

SOA Developer

soadev.jaxbsample.model.Department@8ee016

Java Team

----End testUnmarshallComplexXmlWithDifferentRootQName----

Process exited with exit code 0.

[ Read More ]

How to Create New Excel Sheet Using JSP

In this program, we are going to create a new excel sheet using java .You can create any number of new excel sheets in a excel file.

To create a excel sheet we can use third party APIs .The name of this API is POI. This API is provided by the Apache Jakarta(Jakarta POI - Java API To Access Microsoft Format Files ) Tomcat. You can download POI.jar form Apache Jakarta Project.It is open source.

OLE 2 compound Document Format is based on files including most Microsoft office files as XLS and DOC.

The package we need to import is java.io.InputStream, org.apache.poi.hssf.usermodel.HSSFSheet and org.apache.poi.hssf.usermodel. HSSFWorkbook.

The java.io.InputStream class is used to create file. We are creating an excel file named "newrajesh.xls". The org.apache.poi.hssf.usermodel. HSSFWorkbook class is used to create an object of HSSFWorkbook, by which we will write our new rajesh.xls file. This object allows us to modify the excel file. The org.apache.poi.hssf.usermodel.HSSFSheet is used to create an object of sheet .

The org.apache.poi.hssf.usermodel.HSSFSheet is used to create a new sheet. This class extends java.lang.Object. It is used to create a high level worksheet.

To create new sheet, we use HSSFSheet constructor in which we pass the name of the sheet as an string argument. We can create any number of sheets. As we are creating here six sheet as named new sheet, second sheet ,third sheet ,fourth sheet, and fifth sheet.

You have to follow the following steps to execute this example:

Steps:

Download the POI.jar from Apache Jakarta Project .

Extract it and then copy poi-2.5.1-final-20040804.jar,poi-contrib-2.5.1-final-20040804.jar and poi-scratchpad-2.5.1-final-20040804.jar into C:\apache-tomcat-5.5.23\common\lib directory .

Then download our example copy it into C:\apache-tomcat-5.5.23\webapps\excel.

Start the web server.

Create folder into C drive with the name of C:\excel.

To compile and run open Internet Explore and write http://localhost:8080/excel/excelPoi.jsp.

After pressing enter or on click Go. Output "Your file has been created succesfully" will be diplay on browser

The excel file will be generated into C:\excel folder.

The code of the program is given below:

<%@ page import="java.io.InputStream" %>
<%@ page import="org.apache.poi.hssf.usermodel.HSSFSheet"%>
<%@ page import="org.apache.poi.hssf.usermodel.HSSFWorkbook"%>
<%@ page contentType="application/vnd.ms-excel" %>
<%@ page import="java.io.*" %>
<%
  try {
 HSSFWorkbook wb = new HSSFWorkbook();
  HSSFSheet sheet1 = wb.createSheet("new sheet");
  HSSFSheet sheet2 = wb.createSheet("second sheet");
 HSSFSheet sheet3 = wb.createSheet("third sheet");
  HSSFSheet sheet4 = wb.createSheet("fourth sheet");
 HSSFSheet sheet5 = wb.createSheet("third sheet");
  HSSFSheet sheet6 = wb.createSheet("fifth sheet");
  FileOutputStream fileOut = new FileOutputStream
("c:\excel\newrajesh.xls");
  wb.write(fileOut);
  fileOut.close();  
 out.println("Your file has been created succesfully");
  } catch ( Exception ex ) {
  
  } 
%>

[ Read More ]

Static file auto approver

This is a lisener that automatically approve a static file when created / updated.

import com.vignette.as.client.exception.ApplicationException;
import com.vignette.as.client.exception.AuthorizationException;
import com.vignette.as.client.exception.ValidationException;
import com.vignette.as.config.ConfigUtil;
import com.vignette.as.config.component.AppSvcsComponent;
import com.vignette.as.server.event.AsDeploymentEvent;
import com.vignette.as.server.event.AsEvent;
import com.vignette.as.server.event.AsFileDeploymentEvent;
import com.vignette.as.server.event.IAsEventListener;
import com.vignette.config.client.common.ConfigException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;


public class StaticFileApprover implements IAsEventListener {
    
    private final static String APPROVED = "approved";
    private final static String APPSVCS_DATASOURCE = AppSvcsComponent.APPSVCS_RESOURCE_MNEMONIC;
    
    
    /**
     * Constructor StaticFileApprover.
     */

    public StaticFileApprover() {
    }
    
    /**
     * Processes, or consumes, events of interest.
     *
     * @param event the event.
     * @throws ApplicationException   thrown if application errors occur when an
     *                                AsEvent is processed.
     * @throws AuthorizationException thrown if security errors occur when an
     *                                AsEvent is processed.
     * @throws ValidationException    thrown if validation errors occur when an
     *                                AsEvent is processed.
     */
    public void consume(AsEvent event) throws ApplicationException, AuthorizationException, ValidationException {
        try {
            if (event.getClass() == com.vignette.as.server.event.AsFileDeploymentEvent.class) {
                if (event.getType().equals(AsDeploymentEvent.FILE_CREATE)) {
                    System.out.println("*******StaticFileApprover - Post Persistence Create Event is triggered.");
                    processEvent((AsFileDeploymentEvent)event);
                } else if (event.getType().equals(AsDeploymentEvent.FILE_UPDATE)) {
                    processEvent((AsFileDeploymentEvent)event);
                }
            }
        } catch (Exception e) {
            System.out.println(e.toString());
        }
    }
    
    private void processEvent(AsFileDeploymentEvent event) throws  ApplicationException, AuthorizationException, ValidationException {
        Connection conn = null;
        PreparedStatement stmt = null;
        try {
            StringBuffer sql = new StringBuffer();
            sql.append("UPDATE vgnAsMoMetaData SET status= ?");
            sql.append(" WHERE contentMgmtId = ?");
            conn = ConfigUtil.getJDBCConnection(APPSVCS_DATASOURCE);
            stmt = conn.prepareStatement(sql.toString());
            stmt.setString(1, APPROVED);
            stmt.setString(2, event.getManagedObjectVCMRef().getId());
            stmt.executeUpdate();
            System.out.println(new java.util.Date() + "*******StaticFileApprover - File Approved. File Path = '" + event.getFilePath() + "'.");
        } catch (ConfigException configExc) {
            System.out.println(new java.util.Date() + " **********StaticFileApprover: ConfigException: " + configExc);
        } catch (SQLException sqlExc) {
            System.out.println("*******StaticFileApprover: SQLException: "+sqlExc.toString());
            System.out.println(new java.util.Date() + "******** StaticFileApprover: SQLException: " + sqlExc);
        } finally {
            if (stmt != null) {
                try {
                    stmt.close();
                } catch (Throwable t) {
                    System.out.println("********StaticFileApprover: SQLException: "+t);
                    System.out.println(new java.util.Date() + " *******StaticFileApprover: Error closing PreparedStatement: " + t);
                }
            }
            if (conn != null) {
                try {
                    conn.close();
                } catch (Throwable t) {
                    System.out.println(new java.util.Date() + " **********StaticFileApprover: Error closing Connection: " + t);
                }
            }
        }
    }
    
    /**
     * Returns the priority of the event handler.
     *
     * @return Integer number representing the event handler priority.
     * @see com.vignette.as.server.event.IAsEventListener
     */
    public int getPriority() {
        return IAsEventListener.HIGH_PRIORITY;
    }
    
}

[ Read More ]

Conversion of date or time from one timezone to another

Converts a date/time from one timezone to another.

/*   
* Converts time from sourceTZ TimeZone to destTZ TimeZone.
*    
* @return converted time, or the original time, in case the datetime could not be parsed    
*    
*/


private String convTimeZone(String time, String sourceTZ, String destTZ)  
{    
 final String DATE_TIME_FORMAT = "yyyyMMdd-HH:mm:ss";     
 SimpleDateFormat sdf = new SimpleDateFormat(DATE_TIME_FORMAT);     
 Date specifiedTime;    
 try {      
  if (sourceTZ != null)        
   sdf.setTimeZone(TimeZone.getTimeZone(sourceTZ));       
  else        
   sdf.setTimeZone(TimeZone.getDefault()); // default to server's timezone      
  specifiedTime = sdf.parse(time);    
 }    
 catch (Exception e1) {      
   try 
   {        
  specifiedTime = new Time(time).getAsDate();      
   } catch (Exception e2) {        
     //         
     return time;      
   }    
        }

 // switch timezone    
 if (destTZ != null)      
  sdf.setTimeZone(TimeZone.getTimeZone(destTZ));    
 else      
  sdf.setTimeZone(TimeZone.getDefault()); // default to server's timezone     
 return sdf.format(specifiedTime);  
}

[ Read More ]

Java Stack Trace at any point for debugging

This code snippet gives us Stack flow at any point in java code execuition irrespective of any errors. This oudl be really helpful where we are new to the project and trying to under stand teh work flow. By invoking this method call , it prints the stack trace , thus giving us clarity on the work flow.

public static void showCallStack() 

{ 
 System.out.println("  Call Stack trace...............n***************************START************n");
 // Will create stack trace of current thread execution
 StackTraceElement[] stackTraceElements = Thread.currentThread().getStackTrace(); 
 //for looping  across the stack trace elements   
 for (int i=2 ; i<stackTraceElements.length; i++)        
 { 
  StackTraceElement ste = stackTraceElements[i]; 
  String classname = ste.getClassName();         
  String methodName = ste.getMethodName();          
  int lineNumber = ste.getLineNumber();             
  System.out.println( classname+"."+methodName+":"+lineNumber); 
 } 

 System.out.println("  Call Stack trace ends ...............n**********************************************nnn");  

}

[ Read More ]

Usage of Classpath Xml Application Context

Usage of ClasspathXmlApplicationContext

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd">

    <bean id="test" class="TestBean">
        <property name="name" value="${name}"/>
    </bean>

    <context:property-placeholder location="classpath:test.properties" />
    <context:component-scan base-package="*"/>

</beans>

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {
  public static void main(String[] z) {
    ApplicationContext context = new ClassPathXmlApplicationContext("context.xml", Main.class);
    TestBean testBean = (TestBean)context.getBean("test");
    System.out.println(testBean);
  }

}
class TestBean {
  private String name;

  public String getName() {
      return name;
  }
  public void setName(String name) {
      this.name = name;
  }
  @Override
  public String toString() {
      final StringBuilder sb = new StringBuilder();
      sb.append("TestBean");
      sb.append("{name='").append(name).append('\'');
      sb.append('}');
      return sb.toString();
  }
}

[ Read More ]

Caching implementation using Static variable

In we application perfromance can be improved by caching some Datatable in Memory. Using the given code data can be cached on application startup

web.xml
This entry is to be made if caching needs to be done on startup of server

<servlet>
  <description>
  </description>
  <display-name>CacheMyData</display-name>
  <servlet-name>CacheMyData</servlet-name>
  <servlet-class>com.ultimatix.framework.CacheMyData</servlet-class>
  <load-on-startup>2</load-on-startup>
 </servlet>

CacheMyData.java

//This is the servlet which will initialize the Instance of the Data to be cached 
 
 
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
/**
 * Servlet implementation class CacheMyData
 */
public class CacheMyData extends HttpServlet {
 private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public CacheMyData() {
        super();
        // TODO Auto-generated constructor stub
    }

 /**
  * @see Servlet#init(ServletConfig)
  */
 public void init(ServletConfig config) throws ServletException {
  // TODO Auto-generated method stub
     
  CacheDataVO.getInstance();
  
 }

}

CacheDataVO.java

//This is the class where Cached Data will be stored in a static variable
//From any Bean of the project the instance of this class can be called and Data can be retrieved
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;

public class CacheDataVO{
 
 
 //these are the static members which will be initialized
 private static HashMap<string list="list"> menuHashMap = new HashMap<string list="list">();
 private static CacheDataVO cacheDataVO= null; 
 
 private CacheDataVO(){
  
  menuHashMap.put("Key","MyDataGoesHere");
 
 
 } 
 
 public static CacheDataVO getInstance(){  
  if(cacheDataVO == null){   
   cacheDataVO = new cacheDataVO();   
  }
  return cacheDataVO;
 }
}

[ Read More ]

Generate Captcha in Java

This code snippet will generate captcha using java

import java.util.*;
public class Captcha {
 public String generateCaptcha() {
  Random random = new Random();
  int length = 5;
  StringBuffer captchaStringBuffer = new StringBuffer();
  for (int i = 0; i < length; i++) {
   int captchaNumber = Math.abs(random.nextInt()) % 60;
   int charNumber = 0;
   if (captchaNumber < 26) {
    charNumber = 65 + captchaNumber;
   }
   else if (captchaNumber < 52){
    charNumber = 97 + (captchaNumber - 26);
   }
   else {
    charNumber = 48 + (captchaNumber - 52);
   }
   captchaStringBuffer.append((char)charNumber);
  }

  return captchaStringBuffer.toString();
 } 
}
class Main{
 public static void main(String[] args){
  Captcha captcha = new Captcha();
  String str = captcha.generateCaptcha();
  System.out.println(str);
 }
}

[ Read More ]

Analyzing documents storage in Documentum Repository

This code snippet will use to analyzing the documents storage in each business unit for everymonth and send the report to the business unit manager. This report will helps to unit manager to documentum usage for each business unit.

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.StringTokenizer;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
//import org.apache.poi.hssf.util.CellRangeAddress;
import org.apache.poi.ss.util.CellRangeAddress;

import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.IndexedColors;

import com.documentum.com.DfClientX;
import com.documentum.fc.client.DfQuery;
import com.documentum.fc.client.IDfClient;
import com.documentum.fc.client.IDfCollection;
import com.documentum.fc.client.IDfDocument;
import com.documentum.fc.client.IDfQuery;
import com.documentum.fc.client.IDfSession;
import com.documentum.fc.client.IDfSessionManager;
import com.documentum.fc.common.DfException;
import com.documentum.fc.common.DfId;
import com.documentum.fc.common.IDfLoginInfo;


public class DCTMUsageReport {

 /**
  * @param args
  * @throws IOException 
  */
 public static FileInputStream fis = null; 
 public static FileOutputStream fos = null; 
 public static String mailRecepient =null; 
 public static String host =null; 
 public static String fromId =null;  
 public static String userName =null; 
 public static String password =null; 
 public static String docbase =null; 
 public static String filePath =null; 
 public static String attachmentName =null;  
 public static String supportTeamID =null;  

 public static void main(String[] args) throws Exception  {
  // TODO Auto-generated method stub
  //Read the values from properties file
  String PROP_FILE = "DCTMUsageReport.properties";
  InputStream is = DCTMUsageReport.class.getResourceAsStream(PROP_FILE);   
  Properties prop = new Properties();   
  prop.load(is); 
  //Doc Base connection values
  userName = prop.getProperty("SUPER_USER_ID");
  password = prop.getProperty("SUPER_USER_PASS");
  docbase = prop.getProperty("DOCBASE_NAME");   
  //Input data file 
  String dataFile =prop.getProperty("INPUT_DATA_FILE"); 
  System.out.println("dataFile:"+dataFile);
  //File Location
  filePath =prop.getProperty("DATA_FILE_LOCATION");
  System.out.println("filePath:"+filePath);
  fromId =prop.getProperty("CUSTOM_MAIL_FROM_ID");
  System.out.println("fromId:"+fromId);
  supportTeamID =prop.getProperty("SUPPORT_TEAM_EMAIL_ID");
  System.out.println("fromId:"+supportTeamID);
  //List to store the values read from input data file
  List sheetData = new ArrayList();   
  try { 
   //Read the Business Unit,report generation query,sheet name recipient list and sort order from excel file
   fis = new FileInputStream(dataFile); 
   HSSFWorkbook workbook = new HSSFWorkbook(fis);           
   HSSFSheet sheet = workbook.getSheetAt(0);   
   Iterator rows = sheet.rowIterator();        
   while (rows.hasNext()) {                 
    HSSFRow row = (HSSFRow) rows.next();              
    Iterator cells = row.cellIterator();               
    List data = new ArrayList();
    while (cells.hasNext()) {                 
     HSSFCell cell = (HSSFCell) cells.next();                     
     data.add(cell);                
    }             
    sheetData.add(data); 
   }    
  } catch (IOException e) {          
   e.printStackTrace();         
  } finally {            
   if (fis != null) {    
    fis.close();              
   }       
  }   
  //call the getInputData() method to generate report based on BU
  getInputData(sheetData);   
 }  

 /**
  * Method to generate the NA Activity Report for same Business Unit in the single workbook
  * @param List sheetData
  *
  */
 private static void getInputData(List sheetData) throws Exception { 
  //Call the creationDate() method to get the report generation period
  String strCreationDate=creationDate();
  String strTempBU ="";
  String wbName="";
  String strBUnit="";
  String strsortOrder="";
  String strRQuery="";
  String strRecipient="";
  String strsheetName ="";
  ArrayList mailBU = new ArrayList();
  ArrayList mailReceipient = new ArrayList();
  DCTMUsageReport dctmUsageReport = new DCTMUsageReport();
  for (int i = 1; i < sheetData.size(); i++) { 

   List list = (List) sheetData.get(i);    
   //Retrieve the values from the Array list
   HSSFCell bUnit = (HSSFCell) list.get(0); 
   HSSFCell reportQuery = (HSSFCell) list.get(1); 
   HSSFCell recipient = (HSSFCell) list.get(2); 
   HSSFCell sheetName = (HSSFCell) list.get(3); 
   HSSFCell sortOrder = (HSSFCell) list.get(4); 
   strBUnit = bUnit.getRichStringCellValue().getString();
   strsortOrder = sortOrder.getRichStringCellValue().getString();
   strRQuery = reportQuery.getRichStringCellValue().getString()+ strCreationDate +strsortOrder ; 
   strRecipient = recipient.getRichStringCellValue().getString(); 
   strsheetName = sheetName.getRichStringCellValue().getString();   
   System.out.println("BusinessUnit:"+strBUnit);
   System.out.println("ReportQuery:"+strRQuery);   
   //Check for recipient email id is not null, 
   //if it is null then send the report to support team email id mention in the properties file
   if(strRecipient.equalsIgnoreCase("")){
    strRecipient=supportTeamID;
   }
   //Check for previous report business unit - If business unit is same for the previous report, 
   //the new report will be added as a new sheet in the previous report, else the report will be created as a new workbook
   if(!strTempBU.equalsIgnoreCase(strBUnit)){
    HSSFWorkbook workbook = new HSSFWorkbook(); 
    HSSFSheet firstSheet = workbook.createSheet(strsheetName); 
    wbName = strBUnit+" Usage Report.xls"; //Naming the report based on the business unit
    //call for generating the report
    dctmUsageReport.generateReport(strRQuery, workbook,firstSheet,wbName);    
    //Assign the Business Unit(BU) to temporary variable for creating multiple sheets in the same workbook for single BU    
    mailBU.add(strBUnit);
    mailReceipient.add(strRecipient);
    strTempBU =strBUnit;
   }
   else{// If BU is same for multiple doc types, create a new sheet in the existing workbook   
    POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(filePath+wbName));  //Read the existing file, that is created for same BU
    // create a workbook out of the input stream  
    HSSFWorkbook wb = new HSSFWorkbook(fs);  
    HSSFSheet nextSheet = wb.createSheet(strsheetName);     
    //call for generating the report
    dctmUsageReport.generateReport(strRQuery, wb,nextSheet,wbName);     
   }    
  }
  //Call the sendMailAttachment() method to send the generated usage report
  for (int j=0;j< mailBU.size(); j++){
   String bussUnit =mailBU.get(j).toString();//To get the business unit 
   String receipientUnit =mailReceipient.get(j).toString();//To get the recipients list
   String attachmentName = filePath+bussUnit+" Usage Report.xls";//To form the attachment file name based on the BU with location
   dctmUsageReport.sendMailAttachment(attachmentName,receipientUnit,bussUnit);
  }
 }

 /**
  * Method to get the report generation period based on the current Date
  * Usually the period will be completed period of last month from current date
  * @return String
  *
  */
 public static String creationDate(){
  //Set the date format
  DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
  Calendar cal = Calendar.getInstance();
  //Get the first date of current month
  cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.DAY_OF_MONTH));
  String endDate = (dateFormat.format(cal.getTime()));
  //Get the first date for last month
  cal.add(Calendar.MONTH,-1);
  cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.DAY_OF_MONTH));
  String startDate = (dateFormat.format(cal.getTime()));
  //Get the report generation period for last month
 String creationDate =" and r_creation_date between date('"+ startDate+"') and date('" + endDate +"')";
  
  //String creationDate =" and s.r_creation_date between date('03/01/2011') and date('04/01/2011') ";
  return creationDate;
 }
 /**
  * Method to generate the NA Activity Report
  * @param query
  * @param workbook
  * @param sheet 
  */
 public void generateReport( String execQuery, HSSFWorkbook workbook, HSSFSheet sheet,String reportName)throws Exception{

  DfClientX clientx = new DfClientX();
  IDfClient client = clientx.getLocalClient();
  IDfLoginInfo login = clientx.getLoginInfo();
  login.setUser(userName);
  login.setPassword(password);
  login.setDomain("");
  IDfSessionManager sMgr = client.newSessionManager(); 
  IDfSession session = null; 
  String a_name ="";
  String a_value ="";
  
  ArrayList headers = new ArrayList();  
  try {            
   //Set the date format
   DateFormat dateFormat = new SimpleDateFormat("dd-MMM-yyyy");
   Calendar cal = Calendar.getInstance();
   //Get the first date of current month
   cal.add(Calendar.MONTH,-1);
   cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
   //Get the last day of previous month to mention in the report
   String lastDate = (dateFormat.format(cal.getTime()));
   sMgr.setIdentity(docbase,login);   
   session = sMgr.getSession(docbase);    
   IDfQuery query2 = new DfQuery();
   query2.setDQL(execQuery);
   //Execute the query
   IDfCollection collection2 = query2.execute(session, IDfQuery.DF_EXEC_QUERY);
   //Get the total attribute count in the query
   int cnt = collection2.getAttrCount();
   //Header for Activity report and Date & Time
   HSSFRow hssfHeader1 = sheet.createRow(0);
   //Create the style for cell
   HSSFCellStyle cellStyle1 = workbook.createCellStyle();
   //Set the alignment 
   cellStyle1.setAlignment(HSSFCellStyle.ALIGN_CENTER);
   //Set the border
   cellStyle1.setAlignment(HSSFCellStyle.BORDER_THICK);
   //Merge the Caption Cells 
   sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, cnt-2));   
   //Set the font for the Caption
   HSSFFont capFont = workbook.createFont();
   capFont.setFontName(HSSFFont.FONT_ARIAL); 
   capFont.setColor(IndexedColors.BLACK.getIndex());  
   capFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
   cellStyle1.setFont(capFont);
   cellStyle1.setAlignment((short) 0); 
   HSSFCell hssfCell1 = hssfHeader1.createCell(0);   
   hssfCell1.setCellStyle(cellStyle1);
   cellStyle1.setAlignment(HSSFCellStyle.ALIGN_CENTER);
   //Set the header for the report
   hssfCell1.setCellValue("DCTM Usage Report excludes documents created by ECMDSM1, ia_admin and Viewstar - For the Month Ending "+lastDate);
   int i =1;
   int cellIdx=0;
   //To write the column headers
   while(i < cnt )
   {
    headers.add(collection2.getAttr(i).getName());    
    i++;
   }
   HSSFRow hssfHeader = sheet.createRow(2);
   //Set the font and styles
   HSSFFont font = workbook.createFont();
   font.setFontName(HSSFFont.FONT_ARIAL); 
   font.setColor(IndexedColors.BLACK.getIndex());  
   font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); 
   HSSFCellStyle cellStyle = workbook.createCellStyle();
   cellStyle.setFont(font); 
   cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
   cellStyle.setAlignment(HSSFCellStyle.BORDER_THIN);
   //Get and set the column headers
   for (Iterator cells = headers.iterator(); cells.hasNext();) {
    HSSFCell hssfCell = hssfHeader.createCell(cellIdx);
    hssfCell.setCellStyle(cellStyle);
    hssfCell.setCellValue((String) cells.next());   
    sheet.autoSizeColumn(cellIdx); 
    //sheet.setColumnWidth(cellIdx,5000);
    cellIdx++;
   }    
   int rowIdx = 3;//Caption is written on top 2 rows and write the report from 3rd row
   //Get the attribute values and set the values in the workbook
   while(collection2.next())
   {     
    i = 0;
    int collIndex =0;
    HSSFRow hssfRow = sheet.createRow(rowIdx++);
    while(i < (cnt-1)){  
     collIndex=i+1;     
     HSSFCell hssfCell = hssfRow.createCell(i); 
     /*IDfAttr attr_name = collection2.getAttr(collIndex);
     if(attr_name.isRepeating()){
      a_name = attr_name.getName();
      a_value= collection2.getAllRepeatingStrings(a_name, ",");
      hssfCell.setCellValue(a_value);
     }else {*/
     String attribute  = collection2.getAttr(i).getName();
     String value = collection2.getValueAt(i++).toString();
     IDfDocument object = (IDfDocument)(session.getObject(new DfId(collection2.getString("r_object_id"))));
     String repeatingValue = object.getAllRepeatingStrings(attribute, ",");
     if(repeatingValue != null && repeatingValue.trim() != "")
     {
      value = repeatingValue;
      hssfCell.setCellValue(value);      
     }else{
      hssfCell.setCellValue(value);
      //hssfCell.setCellValue(collection2.getValueAt(collIndex).toString());
     }
     sheet.setColumnWidth(i,5000);
     HSSFCellStyle cellStyle2 = workbook.createCellStyle();
     cellStyle2.setWrapText(true);
     hssfCell.setCellStyle(cellStyle2); 
     i++;     
    }
   }           
   collection2.close();  //close the collection
   fos = new FileOutputStream(new File(filePath+reportName));
   workbook.write(fos); //Write the data to workbook
   System.out.println("Report Generated");
  } 
  catch(DfException df){
   System.out.println("dfc Exception :"+df.getStackTraceAsString());
  }
  catch (Exception e1) {           
   e1.printStackTrace();                                                        
  }finally {
   sMgr.release(session);
   if (fos != null) {  
    fos.flush();             
    fos.close();     
   } 
  }
 } 
 /**
  * Method will send the generated NA usage report to the recipients mentioned each BU
  * @param fileName
  * @param recMailID
  * @return businessUnit
  */
 
 public  void sendMailAttachment( String fileName, String recMailID,String businessUnit){
  try {
   //Set the date format
   DateFormat dateFormat = new SimpleDateFormat("dd-MMM-yyyy");
   Calendar cal = Calendar.getInstance();
   //Get the first date of current month
   cal.add(Calendar.MONTH,-1);
   cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
   //Get the last day of previous month to mention in the report
   String lastDate = (dateFormat.format(cal.getTime()));
   // Create the message to send
   File tempFile = new File(fileName);
   //Custom Mail Server
   host = "mail10.custom.com";  
   Properties sysProperties = System.getProperties();
   sysProperties.setProperty("mail.smtp.host", host);
   Session session = Session.getDefaultInstance(sysProperties);
   Message message = new MimeMessage(session);
   // From Email Address
   message.setFrom(new InternetAddress(fromId));
   //Split the multiple recipients based on the ',' delimiter and add the email id to the recipient list
   StringTokenizer st = new StringTokenizer(recMailID, ",");
   while(st.hasMoreTokens()){
    message.addRecipient(Message.RecipientType.TO,new InternetAddress(st.nextToken()));
   }
   // Create a multi-part to combine the parts
   Multipart multipart = new MimeMultipart();
   //Part 1 to add the body message
   MimeBodyPart p1 = new MimeBodyPart();
   //Part 2 to attach the NA usage report
   MimeBodyPart p2 = new MimeBodyPart();
   //Part 3 to add the signature 
   MimeBodyPart p3 = new MimeBodyPart();
   //Form the Body message
   StringBuffer bodyMessage = new StringBuffer();   
   bodyMessage.append("Hi,");
   bodyMessage.append("\n");
   bodyMessage.append("\n");
   bodyMessage.append("Please find the attached Documentum Usage Report");
   bodyMessage.append("\n");
   bodyMessage.append("\n");
   bodyMessage.append("\n");
   //Form the signature
   StringBuffer trailMessage = new StringBuffer();
   trailMessage.append("\n");
   trailMessage.append("\n");
   trailMessage.append("\n");
   trailMessage.append("Regards");
   trailMessage.append("\n");
   trailMessage.append("Documentum Support");  
   trailMessage.append("\n");
   trailMessage.append("\n");
   //Attach the report in the email  
   FileDataSource fds = new FileDataSource(tempFile);
   p2.setDataHandler(new DataHandler(fds));
   p2.setFileName(fds.getName());
   p1.setText(bodyMessage.toString());
   p3.setText(trailMessage.toString());   
   multipart.addBodyPart(p1);
   multipart.addBodyPart(p2);
   multipart.addBodyPart(p3);  
   //Set the subject message
   message.setSubject(businessUnit+" Usage Report for Month ending with "+ lastDate);
   message.setContent(multipart);   
   message.saveChanges();
   // Send message
   Transport.send(message);
  } catch(Exception e){
   e.printStackTrace();
  }
 }
}

[ Read More ]

Encryption Decryption Ulility

This Solution provides a general utilty for encrypting and decrypting any document.

public class Test {
 private  Logger log= Logger.getLogger(getClass());
 
 public static void main(String[] args) {
  Test obj=new Test();
  obj.t1();
 }
 
 public void t1()
 {
  try {
   String sourcePath="c:\\encrpt1.pdf";
   String destPath="c:\\encrpt.pdf";
   
   /*Encryption encrp = new Encryption(true, "BruceWyne");
   encrp.encrypt(2, sourcePath , destPath);


   Decryption decrp = new Decryption(true, "BruceWyne");
   decrp.decrypt(destPath, sourcePath);   
   } catch (Exception e) {
   e.printStackTrace();
  }
  
 }

}

[ Read More ]

To Generate the PDF Report

This code snippet will guide you to how to Generate the PDF report

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.Date;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.Set;
import java.util.ArrayList;
import java.util.Map;
import java.util.Iterator;


import com.lowagie.text.BadElementException;
import com.lowagie.text.Cell;
import com.lowagie.text.Chunk;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Element;
import com.lowagie.text.HeaderFooter;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Phrase;
import com.lowagie.text.Rectangle;
import com.lowagie.text.Section;
import com.lowagie.text.Table;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfEncryptor;
import com.lowagie.text.pdf.PdfPCell;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.Image;
import com.lowagie.text.pdf.codec.GifImage;
import com.lowagie.text.pdf.RandomAccessFileOrArray;
import com.lowagie.text.pdf.codec.TiffImage;
import com.lowagie.text.pdf.codec.GifImage;
import com.lowagie.text.Font;
import com.lowagie.text.FontFactory;
import java.awt.Color;
import java.awt.Graphics;

import com.lowagie.text.Image;


public class Health {
    
 HashMap resultSet=null;
 ServerHealthCheck serverHealthStatus = new ServerHealthCheck();
    public static String dateTime="";
 boolean emailsend=false;
 Date date=new Date();
 private boolean add;
    String filename;
 public static String fileNamev;
    
  Rectangle pageSize = new Rectangle(400,400);
  Document document = new Document (pageSize);
    
 public Health() throws IOException 
 {

  try {
   SimpleDateFormat sdf = new SimpleDateFormat("dd_MMM_yy_HH_mm_ss");

   //System.out.print(sdf);

   dateTime = sdf.format(date).toString();
  // System.out.print(dateTime);
   filename = dateTime + ".pdf";
  // System.out.print(filename);
   PdfWriter writer = PdfWriter.getInstance(document,
     new FileOutputStream("MorningHealthcheck/SUPPORT_ATT/"
       + filename));
  } catch (FileNotFoundException e) {
   System.out.print("Filenot found");
  } catch (DocumentException e) {
   System.out.print("Document not found");
  } catch (Exception e) {
   e.printStackTrace();
  }
  //System.out.println("Started creating PDF File " + filename);
  try {

   document.open();
   document.addTitle("MDIS MorningHealthCheck");
   document.addSubject("PDF Generated by the Automated Health Check");
   document.addKeywords("MorningHealthCheck MDIS");
   document.addCreator("MDISPSS");
   document.addAuthor("Rajashekar D");
   Image image = Image.getInstance("Images/MDIS.jpg");
   image.setAlignment(Image.LEFT);
   image.scaleAbsoluteHeight(20);
   image.scaleAbsoluteWidth(2);
   image.scalePercent(60, 60);
   document.add(image);
  } catch (Exception e1) {
   System.out.print("EXception in Adding the Image");
  }
  try {
   resultSet = serverHealthStatus.connect();
   Set set = resultSet.entrySet();
   Iterator iterator = set.iterator();
   while (iterator.hasNext()) {

    Map.Entry map = (Map.Entry) iterator.next();
    String key = (String) map.getKey();
    document.add(new Paragraph("\n"));
    document.add(new Paragraph("THE BELOW ARE IN " + key,
      FontFactory.getFont(FontFactory.COURIER, 12, Font.BOLD,
        Color.GREEN)));
    HashMap val = (HashMap) map.getValue();
    Set set1 = val.entrySet();
    Iterator iterator1 = set1.iterator();

    while (iterator1.hasNext()) {
     Map.Entry map1 = (Map.Entry) iterator1.next();
     String Key = (String) map1.getKey();
     document.add(new Paragraph("\n"));
     document.add(new Paragraph(Key, FontFactory.getFont(
       FontFactory.COURIER, 10, Font.BOLD, new Color(0, 0,
         255))));
     document.add(new Paragraph("\n"));
     ArrayList value = (ArrayList) map1.getValue();

     Iterator ite = value.iterator();

     while (ite.hasNext()) {
      String line = (String) ite.next();
      Paragraph p = new Paragraph(line, FontFactory.getFont(
        FontFactory.COURIER, 7, Font.NORMAL,
        Color.WHITE));
      PdfPTable table = new PdfPTable(1);
      PdfPCell cell = new PdfPCell(p);
      cell.setHorizontalAlignment(200);
      cell.setBackgroundColor(Color.darkGray);
      cell.setBorder(1);
      cell.setBorderColor(Color.white);
      cell.setColspan(2);
      table.addCell(cell);
      document.add(table);
     }
    }
   }

   emailsend = true;
  } catch (Exception e) {
   System.out.print("null value");
   emailsend = false;
  }finally{
   if(document!=null)
   document.close(); 
  }
  

  try {
   PdfEncryptor.encrypt(new PdfReader(
     "MorningHealthcheck/SUPPORT_ATT/" + filename),
     new FileOutputStream("MorningHealthcheck/SUPPORT_ATT/2"
       + filename), true, "mdis", "",
     PdfWriter.ALLOW_PRINTING | PdfWriter.ALLOW_COPY);

   File tempFile = new File("MorningHealthcheck/SUPPORT_ATT/" + filename);
   tempFile.delete();
   File tempFile2 = new File("MorningHealthcheck/SUPPORT_ATT/2"+ filename);
   tempFile2.renameTo(tempFile);

  // System.out.println("File " + filename+ " has been protected with the password");
   fileNamev = filename;
   emailsend = true;

  } catch (DocumentException e) {
   //System.out.print("Document not found");
   emailsend = false;
  }

  if (emailsend = true) {
   EmailSend send = new EmailSend();
  } else {
   System.out.print("There is an problem and Exceptions in the Document Preparing");
  }
      System.out.print("You are here exit from the sentrion mail handler");
 }      

 public static void main(String args []) throws IOException
 {
  Health a=new Health();
  System.out.print("Your out of the box");
  //System.exit(0);
 } 
}

[ Read More ]

Thumbnail of an image in Java

Java Code can be used to generate Thumbnail of Image in Java

private void createThumbnail(String filename, int thumbWidth, int thumbHeight, int quality, String outFilename)
        throws InterruptedException, FileNotFoundException, IOException
    {
        // load image from filename
        Image image = Toolkit.getDefaultToolkit().getImage(filename);
        MediaTracker mediaTracker = new MediaTracker(new Container());
        mediaTracker.addImage(image, 0);
        mediaTracker.waitForID(0);
        // use this to test for errors at this point: System.out.println(mediaTracker.isErrorAny());
         
        // determine thumbnail size from WIDTH and HEIGHT
        double thumbRatio = (double)thumbWidth / (double)thumbHeight;
        int imageWidth = image.getWidth(null);
        int imageHeight = image.getHeight(null);
        double imageRatio = (double)imageWidth / (double)imageHeight;
        if (thumbRatio < imageRatio) {
            thumbHeight = (int)(thumbWidth / imageRatio);
        } else {
            thumbWidth = (int)(thumbHeight * imageRatio);
        }
         
        // draw original image to thumbnail image object and
        // scale it to the new size on-the-fly
        BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics2D = thumbImage.createGraphics();
        graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
         
        // save thumbnail image to outFilename
        BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(outFilename));
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
        JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);
        quality = Math.max(0, Math.min(quality, 100));
        param.setQuality((float)quality / 100.0f, false);
        encoder.setJPEGEncodeParam(param);
        encoder.encode(thumbImage);
        out.close();
    }

[ Read More ]

GENERATE GZIP FILE AS HTTPSERVLET RESPONSE OUTPUT USING JAVA

This util method is used for increasing performance by reducing the time and output xml size. The concept is just compress the xml content and send it as a gzip file. So the file size will reduce much better and responce will be faster

public static HttpServletResponse GZipFileGenerator(
   HttpServletResponse response, String xmlString, String fileName)
   throws IOException {

  try {
   //create a temp file with gzip file extension (.gz)
   File temp = File.createTempFile(fileName, ".gz");
   //Delete the temp file on exit of the program
   temp.deleteOnExit();
   //Creating Buffered output stream contains gzip (temp) file
   BufferedOutputStream out = new BufferedOutputStream(
     new GZIPOutputStream((new FileOutputStream(temp))));
   //writing the xml to the Buffered output stream
   out.write(xmlString.getBytes("UTF-8"));
   out.close();
   //Now the gzip file is generated with xml data.
   
   //Apend the temp gzip xml file to the response.
   response.setContentType("application/gzip");
   response.setHeader("Content-Disposition",
     "attachment; filename= \"  " + fileName + ".gz \"");
   FileInputStream fileInput = new FileInputStream(temp);
   //Reading the file size and set the content to response
   int size = fileInput.available();
   response.setContentLength(size);
   byte[] filesize = new byte[size];
   OutputStream outputStream = response.getOutputStream();
   int bytesread;
   do {
    bytesread = fileInput.read(filesize, 0, size);
    if (bytesread > -1)
     outputStream.write(filesize, 0, bytesread);
   } while (bytesread > -1);
   fileInput.close();
   outputStream.flush();
   outputStream.close();
  } catch (Exception e) {

  }
  return response;
 }

[ Read More ]

To get current Date and Time of different Timezones

if you want display or use current Date and Time of different Timezones, In your applications.

/*To get Current Date and Time of Different TimeZones. 
 * In main block you can change the 'timeZone' name to get Date and Time of different zones.
 * */
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;

public class  Date_Time
{
 
 public static Date getDate(Date currentDate, String timeZone) {
  Calendar gcal = new GregorianCalendar(TimeZone.getTimeZone(timeZone));
  gcal.setTimeInMillis(currentDate.getTime());

  Calendar cale = Calendar.getInstance();
  cale.set(Calendar.YEAR, gcal.get(Calendar.YEAR));
  cale.set(Calendar.MONTH, gcal.get(Calendar.MONTH));
  cale.set(Calendar.DAY_OF_MONTH, gcal.get(Calendar.DAY_OF_MONTH));
  cale.set(Calendar.HOUR_OF_DAY, gcal.get(Calendar.HOUR_OF_DAY));
  cale.set(Calendar.MINUTE, gcal.get(Calendar.MINUTE));
  cale.set(Calendar.SECOND, gcal.get(Calendar.SECOND));
  cale.set(Calendar.MILLISECOND, gcal.get(Calendar.MILLISECOND));
  return cale.getTime();
 }

 public static void main(String Args[]) {
  Date now = new Date();
  Calendar cal = Calendar.getInstance();
  String timeZone = "Europe/Zurich"; 
  System.out.println("System Date = "+now.toString());
  System.out.println( timeZone+" = "+getDate(now, timeZone));
 }

 
}

[ Read More ]