JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to compress a file in GZip format?


Description:

The below example shows how to compress a file in GZip format.


Code:
package com.java2novice.zip;

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

public class MyFileGZipExamp {

	public void doGzip(String filePath){
		
		FileOutputStream fos = null;
		GZIPOutputStream gos = null;
		FileInputStream fis = null;
		try {
			fos = new FileOutputStream("C:/myGzip.gzip");
		    gos = new GZIPOutputStream(fos);
		    fis = new FileInputStream(filePath);
		    byte[] tmp = new byte[4*1024];
		    int size = 0;
		    while ((size = fis.read(tmp)) != -1) {
		        gos.write(tmp, 0, size);
		    }
		    gos.finish();
		    System.out.println("Done with GZip...");
		} catch (IOException e) {
			
		} finally{
			try{
				if(fis != null) fis.close();
				if(gos != null) gos.close();
			} catch(Exception ex){}
		}
	}
	
	public static void main(String a[]){
		
		MyFileGZipExamp mfg = new MyFileGZipExamp();
		mfg.doGzip("C:/test.txt");
	}
}

Output:
Done with GZip...
<< Previous Program | Next Program >>

List of all java.util.zip class sample examples:

  1. How to compress byte array in java?
  2. How to decompress byte array in java?
  3. How to zip a single file?
  4. How to zip multiple files?
  5. How to read zip files entries or file name list?
  6. How to unzip files in java?
  7. How to generate checksum value for for a file in java?
  8. How to compress and store objects using zip utility?
  9. How to decompress the compressed objects using zip utility?
  10. How to zip a file using ZipFile class?
  11. How to compress a file in GZip format?
  12. How to uncompress a file from GZip format?
Knowledge Centre
Transient and Volatile Modifiers
Transient: The transient modifier applies to variables only and it is not stored as part of its object's Persistent state. Transient variables are not serialized.

Volatile: Volatile modifier applies to variables only and it tells the compiler that the variable modified by volatile can be changed unexpectedly by other parts of the program.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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