//zip and unzip files using java
package com.krishna.zip;

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

public class AppZip
{
    List<String> fileList;
    private static final String OUTPUT_ZIP_FILE = "C:\\MyFile.zip";
    private static final String SOURCE_FOLDER = "C:\\testzip";

    AppZip(){
 fileList = new ArrayList<String>();
    }

    public static void main( String[] args )
    {
     AppZip appZip = new AppZip();
     appZip.generateFileList(new File(SOURCE_FOLDER));
     appZip.zipIt(OUTPUT_ZIP_FILE);
    }

 
    public void zipIt(String zipFile){

     byte[] buffer = new byte[1024];

     try{

     FileOutputStream fos = new FileOutputStream(zipFile);
     ZipOutputStream zos = new ZipOutputStream(fos);

     System.out.println("Output to Zip : " + zipFile);

     for(String file : this.fileList){

      System.out.println("File Added : " + file);
      ZipEntry ze= new ZipEntry(file);
         zos.putNextEntry(ze);

         FileInputStream in =
                       new FileInputStream(SOURCE_FOLDER + File.separator + file);

         int len;
         while ((len = in.read(buffer)) > 0) {
          zos.write(buffer, 0, len);
         }

         in.close();
     }

     zos.closeEntry();
     //remember close it
     zos.close();

     System.out.println("Done");
    }catch(IOException ex){
       ex.printStackTrace();
    }
   }

 
    public void generateFileList(File node){

     //add file only
 if(node.isFile()){
  fileList.add(generateZipEntry(node.getAbsoluteFile().toString()));
 }

 if(node.isDirectory()){
  String[] subNote = node.list();
  for(String filename : subNote){
   generateFileList(new File(node, filename));
  }
 }

    }

 
    private String generateZipEntry(String file){
     return file.substring(SOURCE_FOLDER.length()+1, file.length());
    }
}