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Program: How to compress a file in GZip format?


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



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 = != -1) {
		        gos.write(tmp, 0, size);
		    System.out.println("Done with GZip...");
		} catch (IOException e) {
		} finally{
				if(fis != null) fis.close();
				if(gos != null) gos.close();
			} catch(Exception ex){}
	public static void main(String a[]){
		MyFileGZipExamp mfg = new MyFileGZipExamp();

Done with GZip...
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List of all 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
Can interface be final?
No. We can not instantiate interfaces, so in order to make interfaces useful we must create subclasses. The final keyword makes a class unable to be extended.
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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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