How to make a gzip file in java.

In this tutorial you will see how to make a gzip file from any given file.

In this tutorial you will see how to make a gzip file from any given file.

Make a gzip file from any given file.

In this tutorial, we will discuss how to create GZIP file by using GZIPOutputStream class. The GZIPOutputStream class is available in java.util.zip package. The GZIPOutputStream class create a input stream for compressing data in GZIP format file. The FileInputStream class create an input stream for reading data from the file.

In this example, we will create a GZIP file from a given file. First of all, we will read given file with the help of FileInputStream class and then after store data in a internal buffer. The BufferedInputStream class read bytes from input stream. The write method of GZIPOutputStream class write array of byte onto compress output stream..

GZIPOutputStream API:

The java.util.zip.GZIPOutputStream class extends java.io.FilterIntputStream class. It provides the following methods:

Return type	Method	Description
void	finish()	The finish() method finish writing data on associated output stream and not close stream.
void	close()	The close() method close writing data on associated output stream and close stream.
void	write(byte[] b, int offset, int length)	The write(..) method writes an array of bytes onto compress output stream

Code:

import�java.io.*;
import�java.util.zip.*;
import�java.io.FileOutputStream;
import�java.io.FileInputStream;
import�java.util.zip.GZIPOutputStream;
import�java.io.IOException;

class�Gzipcompress�{
  ��static�String�sourcefile�=�"testfile.txt";

  ��public�static�void�main(String�args[])�{
    ��try�{
      File�oldfile�=�new�File(sourcefile);
      System.out.println("�Given�file�name�is��:�"�+�oldfile);
      FileInputStream�finStream�=�new�FileInputStream(oldfile);
      BufferedInputStream�bufinStream�=�new�BufferedInputStream(finStream);
      FileOutputStream�outStream�=�new�FileOutputStream(oldfile);
      GZIPOutputStream�goutStream�=�new�GZIPOutputStream(outStream);��
      byte[]�buf�=�new�byte[1024];
      int�i;
      while�((i�=�bufinStream.read(buf))�>=�0)�{
        goutStream.write(buf,�0,�i);
        }
      System.out.println("Created��GZIP�file�is�"�+�oldfile�+�".gz");
      System.out.println("GZIP�File�successfully�created");
      bufinStream.close();
      goutStream.close();
      }catch�(IOException�e)�{
        System.out.println("Exception�is"�+�e.getMessage());
        }
      ��}
}

Following is the output if you run the application:

C:\>java Gzipcompress
Given file name is : testfile.txt
Created GZIP file is testfile.txt.gz
GZIP File successfully created

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