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How to decompress gzip file in java
Posted on: July 13, 2010 at 12:00 AM

In this tutorial you will see the use of GZIPInputStream for decompress gzip file.

How to decompress a GZIP file.

In this tutorial, we will discuss about how to decompress a GZIP file. The java.util.zip package provide a class named GZIPInputStream. The GZIPInputStream class create a output stream for reading compress data and decompress GZIP.

About GZIPInputStream API:

Return Type	Method	Description
void	close()	The close() is use to close all stream.
int	read()	The read() method read and decompress GZIP data from associated stream.

Code


import java.util.zip.*;

import java.io.FileOutputStream;

import java.io.FileInputStream;

import java.util.zip.GZIPInputStream;

import java.io.IOException;





public class UnGzip{

  public static void main(String args[]){

    try{

     

         String source = "dd.txt.gz";

   String outFilename = source +".txt";

     System.out.println("File for Extracting :
"+source);

         FileInputStream instream= new FileInputStream(source);

         GZIPInputStream ginstream =new GZIPInputStream(instream);

         FileOutputStream outstream = new FileOutputStream(outFilename);

         byte[] buf = new byte[1024]; 

         int len;

         while ((len = ginstream.read(buf)) > 0) 

        {

          outstream.write(buf, 0, len);

        }

   System.out.println("File Successfylly Extract");

     System.out.println("Extract
file : "+outFilename);

        ginstream.close();

        outstream.close();

      }

    

    catch(IOException ioe){

      System.out.println("Exception has been thrown" + ioe);

    }

  }

}

Output

C:\>java UnGzip
File for Extracting : dd.txt.gz
File Successfylly Extract
Extract File : dd.txt.gz.txt
C:\Work\Bharat\Roseindi_Tutorial\Zip_api\GzipUncopresser>

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