Java.util.zip.InflaterOutputStream class in Java

This class implements an output stream filter for uncompressing data stored in the “deflate” compression format.
Constructors

• InflaterOutputStream(OutputStream out) : Creates a new output stream with a default decompressor and buffer size.
• InflaterOutputStream(OutputStream out, Inflater infl) : Creates a new output stream with the specified decompressor and a default buffer size.
• InflaterOutputStream(OutputStream out, Inflater infl, int bufLen) : Creates a new output stream with the specified decompressor and buffer size.

Methods:

• void close() : Writes any remaining uncompressed data to the output stream and closes the underlying output stream.

  Syntax :
  public void close()
             throws IOException
  Overrides:
  close in class FilterOutputStream
  Throws:
  IOException

• void finish() : Finishes writing uncompressed data to the output stream without closing the underlying stream.

  Syntax :public void finish()
              throws IOException
  Throws:
  IOException

• void flush() : Flushes this output stream, forcing any pending buffered output bytes to be written.

  Syntax :public void flush()
             throws IOException
  Overrides:
  flush in class FilterOutputStream
  Throws:
  IOException

• void write(byte[] b, int off, int len) : Writes an array of bytes to the uncompressed output stream.

  Syntax :public void write(byte[] b,
           int off,
           int len)
             throws IOException
  Overrides:
  write in class FilterOutputStream
  Parameters:
  b - buffer containing compressed data to decompress and write to the output stream
  off - starting offset of the compressed data within b
  len - number of bytes to decompress from b
  Throws:
  IndexOutOfBoundsException 
  IOException
  NullPointerException 
  ZipException

• void write(int b) : Writes a byte to the uncompressed output stream.

  Syntax :public void write(int b)
             throws IOException
  Parameters:
  b - a single byte of compressed data to decompress and write to the output stream
  Throws:
  IOException
  ZipException 
  

Program 1

//Java program to illustrate InflaterInputStream class
import java.io.*;
import java.util.Arrays;
import java.util.zip.DeflaterInputStream;
import java.util.zip.InflaterOutputStream;

class InflaterOutputStreamDemo
{
    public static void main(String[] args) throws IOException
    {
        byte b[] = {1, 2, 3, 4, 5, 6};
        ByteArrayInputStream bin = new ByteArrayInputStream(b);
        DeflaterInputStream din = new DeflaterInputStream(bin);
        byte c[] = new byte[10];
        din.read(c);
        din.close();


        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        InflaterOutputStream ios = new InflaterOutputStream(bos);
        //illustrating write(byte b[],int off,int len)
        ios.write(c);

        //flushing
        ios.flush();

        //Finishes writing uncompressed data to the output stream
        // without closing the underlying stream.
        ios.finish();
        System.out.println(Arrays.toString(bos.toByteArray()));
        bos.close();

        //illustrating close()
        ios.close();
    }
}

Output :

[1, 2, 3, 4, 5, 6]

Program 2:

//Java program to illustrate InflaterInputStream class
import java.io.*;
import java.util.Arrays;
import java.util.zip.DeflaterInputStream;
import java.util.zip.InflaterOutputStream;

class InflaterOutputStreamDemo
{
    public static void main(String[] args) throws IOException
    {
        byte b[] = {1, 2, 3, 4, 5, 6};
        ByteArrayInputStream bin = new ByteArrayInputStream(b);
        DeflaterInputStream din = new DeflaterInputStream(bin);
        FileOutputStream fos=new FileOutputStream("file.txt");
        byte c[] = new byte[10];
        din.read(c);
        fos.write(c);
        din.close();
        fos.close();

        //reading the compressed data
        FileInputStream fis = new FileInputStream("file.txt");

        ByteArrayOutputStream bos1=new ByteArrayOutputStream();
        InflaterOutputStream ios = new InflaterOutputStream(bos1);
        int ch;

        //illustrating write() method
        while ( (ch=fis.read() ) != -1)
        {
            ios.write(ch);
        }
        System.out.print(Arrays.toString(bos1.toByteArray()));
    }

}

Output :

[1, 2, 3, 4, 5, 6]

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