Decompress file using Inflater class.

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Decompress file using Inflater class.
Posted on: July 16, 2010 at 12:00 AM

In this tutorial we will discuss about decompression of a file using Inflater class.

Decompress file using Inflater class.

In this tutorial, we will define the use of Inflater class. The Inflater class provide support for Decompression using ZLIB library. The Inflater class is available in java.util.zip package.The read(....) method read uncompressed data in a bytes array.
In the given Example, we will explain how to decompress file using Inflater class. The Inflater class create a decompresser. The FileInputStream class creates a input stream and read bytes from file. The InflaterInputStream class creates a input stream with a given Inflater. It reads data from stream and decompress. The read() method of InflaterInputStream class read uncompressed data into array of bytes.

About Inflater API:

The java.util.zip.InflaterInputStream class extends java.util.zip.FilterOutputStream class. It provid following method:

Return Type	Method	Description
int	read()	The read(....) method read uncompressed data in a bytes array.
void	close()	The close() method close input stream and releases system resources.

Code


import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.util.zip.Inflater;

import java.util.zip.InflaterInputStream;

import java.io.IOException;



class Demo {

  public static String infile = "bharat.txt.dfl";



  public static String outfilename = "zip.txt";



  public static void dcompressFile() throws IOException {

    System.out.println("Compressed file : " + infile);

    System.out.println("Dcompressed file : " + outfilename);

    InflaterInputStream inflInstream = new InflaterInputStream(

        new FileInputStream(infile), new Inflater());

    FileOutputStream outstream = new FileOutputStream(outfilename);

    boolean completed = false;

    try {



      byte b[] = new byte[1024];

      while (true) {

        int l = inflInstream.read(b, 0, 1024);

        if (l == -1) {

          break;

        }

        outstream.write(b, 0, l);

      }

      completed = true;

      inflInstream.close();

      outstream.close();

    } catch (IOException e) {

      System.out.println("hello");

    }

  }

}



public class InflaterDemo {

  public static void main(String[] args) throws IOException {

    Demo.dcompressFile();

  }

}

Following is the output if you run the application:

C:\>java InflaterDemo
Compressed file : bharat.txt.dfl
Dcompressed file : zip.txt

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