How to Compress a File in GZIP Format in Java

In this example, let’s us see how to compress a file in GZIP format in Java.

Source Code

package com.beginner.examples;

import java.io.*;
import java.util.zip.GZIPOutputStream;

public class FileOperator29Example { 
	public static void main(String[] args) throws IOException{
        
		File file = new File("example.txt");
		FileInputStream fis = new FileInputStream(file);
        GZIPOutputStream gzos = new GZIPOutputStream(new FileOutputStream("example.gz"));

        int len = 0;
        byte[] buf = new byte[1024];
        while ((len = fis.read(buf)) != -1) 
        {
            gzos.write(buf, 0, len);
        }
        gzos.flush();
        fis.close();
        System.out.println("Done!");
    }
}

Output:

Done!

References

Imported packages in Java documentation:

GZIPOutputStream