Read Some Data from a Gzip File

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Contents

[edit] Overview - Read Some Data from a Gzip File

This is a example of Java program.

[edit] Java Source Code

  • Package: com.darwinsys
  • File: ReadGZIP.java
  • File used by the example: file.txt.gz
package com.darwinsys;
 
/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */
 
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.zip.GZIPInputStream;
 
/**
 * Read some data from a gzip file.
 * 
 * @author Ian F. Darwin, http://www.darwinsys.com/
 * @version $Id: ReadGZIP.java,v 1.4 2004/03/06 20:54:38 ian Exp $
 */
public class ReadGZIP {
    public static void main(String[] argv) throws IOException {
	String FILENAME = "c:\\file.txt.gz"; //modified by Code Panda, 20080807
 
	// Since there are 4 constructor calls here, I wrote them out in full.
	// In real life you would probably nest these constructor calls.
	FileInputStream fin = new FileInputStream(FILENAME);
	GZIPInputStream gzis = new GZIPInputStream(fin);
	InputStreamReader xover = new InputStreamReader(gzis);
	BufferedReader is = new BufferedReader(xover);
 
	String line;
	// Now read lines of text: the BufferedReader puts them in lines,
	// the InputStreamReader does Unicode conversion, and the
	// GZipInputStream "gunzip"s the data from the FileInputStream.
	while ((line = is.readLine()) != null)
	    System.out.println("Read: " + line);
    }
}

[edit] What Result You Can Get

Run the program, you will get:


Read: Hello, Java Exampleshow!
Read: 
Read: http://java.exampleshow.com

[edit] Required External Libraries, Files for this Java Example

In order to run this example, you need a GZip file, click file.txt.gz to download it and save it in your C: disk, as C:\file.txt.gz.


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[edit] Question & Answer

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