ZIP or UnZip files or folder using java

In this video I have demonstrated,
1. How to Zip/Compress a file.
2. How to Zip/Compress a Folder.
3. How to Unzip/Decompress file or folder.

1. You can Zip a file using below code.
   Update the path of file and destination as per your need.
   Zip_File_Test.java

   package ZIP;
   import java.io.FileInputStream;
   import java.io.FileOutputStream;
   import java.io.IOException;
   import java.util.zip.ZipEntry;
   import java.util.zip.ZipOutputStream;
   public class Zip_File_Test {
   	public static void main(String[] args) {
   		Zip_File_Test.zip_one_file();
   	}
   	public static void zip_one_file() {
       	byte[] buffer = new byte[1024];
       	try{
       	FileOutputStream fos = new FileOutputStream("E:\\java\\testing.zip");
           ZipOutputStream zos = new ZipOutputStream(fos);
       	ZipEntry ze= new ZipEntry("testing1.txt");
       	zos.putNextEntry(ze);
       	FileInputStream in = new FileInputStream("E:\\java\\testing.txt");
       	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();
       	}
   	}
   }
   

2. You can Zip a Folder with files inside using below code.
   Update the path of file and destination as per your need.
   Zip_Folder.java

   package 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 Zip_Folder {
       List fileList;
       private static final String OUTPUT_ZIP_FILE = "E:\\java\\zip_complete_folder.zip";
       private static final String SOURCE_FOLDER = "E:\\java\\zip_complete_folder";
       Zip_Folder(){
   	fileList = new ArrayList();
       }
       public static void main( String[] args )
       {
       	Zip_Folder appZip = new Zip_Folder();
       	appZip.generateFileList(new File(SOURCE_FOLDER));
       	appZip.zipIt(OUTPUT_ZIP_FILE);
       }
       /**
        * Zip it
        * @param zipFile output ZIP file location
        */
       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();
       }
      }
       /**
        * Traverse a directory and get all files,
        * and add the file into fileList
        * @param node file or directory
        */
       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));
   		}
   	}
       }
       /**
        * Format the file path for zip
        * @param file file path
        * @return Formatted file path
        */
       private String generateZipEntry(String file){
       	return file.substring(SOURCE_FOLDER.length()+1, file.length());
       }
   }
   

3. Unzip any zip files using below code.
   Unzip_File_Folder.java

   package ZIP;
   import java.io.File;
   import java.io.FileInputStream;
   import java.io.FileOutputStream;
   import java.io.IOException;
   import java.util.List;
   import java.util.zip.ZipEntry;
   import java.util.zip.ZipInputStream;
   public class Unzip_File_Folder {
       List fileList;
       private static final String INPUT_ZIP_FILE = "E:\\java\\testing.zip";
       private static final String OUTPUT_FOLDER = "E:\\java\\UNZIPPED_file";
       public static void main( String[] args )
       {
       	Unzip_File_Folder unZip = new Unzip_File_Folder();
       	unZip.unZipIt(INPUT_ZIP_FILE,OUTPUT_FOLDER);
       }
       /**
        * Unzip it
        * @param zipFile input zip file
        * @param output zip file output folder
        */
       public void unZipIt(String zipFile, String outputFolder){
        byte[] buffer = new byte[1024];
        try{
       	//create output directory is not exists
       	File folder = new File(OUTPUT_FOLDER);
       	if(!folder.exists()){
       		folder.mkdir();
       	}
       	//get the zip file content
       	ZipInputStream zis =
       		new ZipInputStream(new FileInputStream(zipFile));
       	//get the zipped file list entry
       	ZipEntry ze = zis.getNextEntry();
       	while(ze!=null){
       	   String fileName = ze.getName();
              File newFile = new File(outputFolder + File.separator + fileName);
              System.out.println("file unzip : "+ newFile.getAbsoluteFile());
               //create all non exists folders
               //else you will hit FileNotFoundException for compressed folder
               new File(newFile.getParent()).mkdirs();
               FileOutputStream fos = new FileOutputStream(newFile);
               int len;
               while ((len = zis.read(buffer)) > 0) {
          		fos.write(buffer, 0, len);
               }
               fos.close();
               ze = zis.getNextEntry();
       	}
           zis.closeEntry();
       	zis.close();
       	System.out.println("Done");
       }catch(IOException ex){
          ex.printStackTrace();
       }
      }
   }