Java.util.zip.GZIPInputStream class in Java

4

This class implements a stream filter for reading compressed data in the GZIP file format.

Constructors

  • GZIPInputStream(InputStream in) : Creates a new input stream with a default buffer size.
  • GZIPInputStream(InputStream in, int size) : Creates a new input stream with the specified buffer size.

Methods :

  • void close() : Closes this input stream and releases any system resources associated with the stream.
    Syntax :public void close()
               throws IOException
    Specified by:
    close in interface Closeable
    Specified by:
    close in interface AutoCloseable
    Overrides:
    close in class InflaterInputStream
    Throws:
    IOException 
  • int read(byte[] buf, int off, int len) : Reads uncompressed data into an array of bytes. If len is not zero, the method will block until some input can be decompressed; otherwise, no bytes are read and 0 is returned.
    Syntax :public int read(byte[] buf,
           int off,
           int len)
             throws IOException
    Overrides:
    read in class InflaterInputStream
    Parameters:
    buf - the buffer into which the data is read
    off - the start offset in the destination array b
    len - the maximum number of bytes read
    Returns:
    the actual number of bytes read, or -1 if the end of the
    compressed input stream is reached
    Throws:
    NullPointerException
    IndexOutOfBoundsException
    ZipException
    IOException 

Methods inherited from class java.util.zip.InflaterInputStream
available, fill, mark, markSupported, read, reset, skip
Methods inherited from class java.io.FilterInputStream
read
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Program :

                                                                              
//Java program demonstrating GZipInputStream methods 

import java.io.FileInputStream;				 
import java.io.FileOutputStream;	 
import java.io.IOException;				 
import java.util.Arrays;
import java.util.zip.GZIPInputStream; 

class GZipInputStreamDemo		 
{																			 
	public static void main(String[] args) throws IOException 
	{																							 
    	FileInputStream fis = new FileInputStream("file.txt"); 
    	GZIPInputStream gzis = new GZIPInputStream(fis);	
    	
    	//Uncompressed FileContents		 
    	//01234567890 
    	byte b[]=new byte[10];
    												
    	//skipping 1 byte	 
    	gzis.skip(1);
    	
    	//illustrating available() and 
    	//read(byte b[],int off,int len) 
    	if( gzis.available()!=-1)	 
    		gzis.read(b);					 
    	System.out.println(Arrays.toString(b));
    								
    	//closing the stream												 
    	gzis.close();														 
	}																		 
} 

Output :

[1, 2, 3, 4, 5, 6, 7, 8, 9, 0]

This article is contributed by Nishant Sharma. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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