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...
Pages
Saturday, September 29, 2012
Saturday, September 22, 2012
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...
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);
...
Friday, September 21, 2012
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...
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);
}
}
...
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...
Thursday, September 20, 2012
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"));
...
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[]) {
...
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...
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...
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...
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...
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...
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...
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));...
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...
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">
...
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...
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 +...
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...
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);...
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...
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...
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
...
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());
...
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September
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- Java program to demonstrate Exception handling
- Sample code to access Oracle DB
- Thread implementation with with synchronized method
- Simple Interest Calculator Java Applet
- QR code generator
- Reading filenames with specific extensions from a ...
- Using filters in Java
- Base64 encoding and decoding in Java
- Creating Custom Pie Chart in Java
- Running the server on multiple ports
- Generate Combinations of Words separated by a deli...
- Converting POJO to XML Element using JAXB Application
- How to Create New Excel Sheet Using JSP
- Static file auto approver
- Conversion of date or time from one timezone to an...
- Java Stack Trace at any point for debugging
- Usage of Classpath Xml Application Context
- Caching implementation using Static variable
- Generate Captcha in Java
- Analyzing documents storage in Documentum Repository
- Encryption Decryption Ulility
- To Generate the PDF Report
- Thumbnail of an image in Java
- GENERATE GZIP FILE AS HTTPSERVLET RESPONSE OUTPUT ...
- To get current Date and Time of different Timezones
- SystemLogger4J
- Send an SMS Using JSP
- Weblogic Monitoring Script
- Java Reflection Field with Annotation
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- To improve performance by using inbuilt arrayCopy(...
- Getting Column Names in Java
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- Dynamic Connection Pooling
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- Loading in System Tray
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- Comparing two XMLs in Java
- Converting Arraylist of objects to array of objects
- Script to Converting XML string to DOM object
- MailLog
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- Java Date Utils
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- Image Manipulations in java.
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- JDBC - Timeout utility
- Page Navigator in Java
- Extract documentum Object Ids from log File
- Validate Bean - A Java Program
- Factorial calculator in Java
- 24 Hour format time validation using regular expre...
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