Zipping and UnZipping Files In Java

Java provides extensive support for zip archives (archived sequences of stored files, which are known as zip entries) via the types located in the java.util.zip package.

represents the source code to a ZipCreate application using ZipOutputStream and ZipEntry to create a zip file and store assorted files in the archive.

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ZipCreate
{
 public static void main(String[] args) throws IOException
 {
  if (args.length < 2)
  {
   System.err.println("usage: java ZipCreate zipfile infile1 "+
     "infile2 ...");
   return;
  }
  try (ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(args[0])))
  {
   byte[] buf = new byte[1024];
   for (String filename: args)
   {
    if (filename.equals(args[0]))
     continue;
    try (FileInputStream fis = new FileInputStream(filename))
    {
     zos.putNextEntry(new ZipEntry(filename));
     int len;
     while ((len = fis.read(buf)) > 0)
      zos.write(buf, 0, len);
     zos.closeEntry();
    }
   }
  }
 }
}

 represents the source code hot to use ZipInputStream and ZipEntry to access a zip file and extract its entries.

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class ZipAccess
{
 public static void main(String[] args) throws IOException
 {
  if (args.length != 1)
  {
   System.err.println("usage: java ZipAccess zipfile");
   return;
  }
  try (ZipInputStream zis =
    new ZipInputStream(new FileInputStream(args[0])))
    {
   byte[] buffer = new byte[4096];
   ZipEntry ze;
   while ((ze = zis.getNextEntry()) != null)
   {
    System.out.println("Extracting: "+ze);
    try (FileOutputStream fos = new FileOutputStream(ze.getName()))
    {
     int numBytes;
     while ((numBytes = zis.read(buffer, 0, buffer.length)) != -1)
      fos.write(buffer, 0, numBytes);
    }
    zis.closeEntry();
   }
    }
 }
}