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Program: How to uncompress a file from GZip format?


Description:

The below example shows how to uncompress a file from GZip format.


Code:
package com.java2novice.zip;

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

public class MyDecomGzip {

	public void doUnGzipFile(String filePath) {

		GZIPInputStream gis = null;
		FileInputStream fis = null;
		FileOutputStream fos = null;
		try {
			fis = new FileInputStream(filePath);
			gis = new GZIPInputStream(fis);
			fos = new FileOutputStream("C:/test.txt");
			byte[] tmp = new byte[4*1024];
			int size = 0;
			while ((size = gis.read(tmp)) > 0) {
				fos.write(tmp, 0, size);
			}
			fos.flush();
			System.out.println("Done with uncompressng GZip file.");
		} catch (IOException ex) {
			ex.printStackTrace();
		} finally {
			try{
				if(gis != null) gis.close();
				if(fos != null) fos.close();
			} catch(Exception ex){}
		}
	}

	public static void main(String a[]) {

		MyDecomGzip mfg = new MyDecomGzip();
		mfg.doUnGzipFile("C:/myGzip.gzip");
	}
}

Output:
Done with uncompressng GZip file.
<< Previous 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
Where can we use serialization?
Whenever an object has to sent over the network, those objects should be serialized. Also if the state of an object is to be saved, objects need to be serilazed.
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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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