BE THE CODER > Java > Zip Utilities > GZip File UnCompression

The following example shows how to unzip a file compressed using GZip compression. To create uncompressed file we need to copy bytes from GZIP input stream to output stream.

File Name :	com/bethecoder/tutorials/utils/zip/GZipFileUnCompression.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.utils.zip;



import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.util.zip.GZIPInputStream;



public class GZipFileUnCompression {



  /**

   * @param args

   */

  public static void main(String[] args) {



    String srcZipFilePath = "C:\\prop_file.txt.gzip";

    String tgtFilePath = "C:\\prop_file.txt"; 



    gzipUnCompressFile(srcZipFilePath, tgtFilePath);

  }



  public static void gzipUnCompressFile(String srcZipFilePath, String tgtFilePath) {

    try {

       //Open GZIP input stream

      GZIPInputStream inStream = new GZIPInputStream(new FileInputStream(srcZipFilePath));



      //Open target stream

      OutputStream outStream = new FileOutputStream(tgtFilePath);



      //Copy bytes from source stream to target stream

      byte[] buf = new byte[2048];

      int len;

      while ((len = inStream.read(buf)) > 0) {

        outStream.write(buf, 0, len);

      }



      //Close all streams

      inStream.close();

      outStream.close();



      System.out.println("File successfully uncompressed : " + tgtFilePath);



    } catch (IOException e) {

      e.printStackTrace();

    }

  }

}