JAVA EE: Java Tutorial : Java IO (Java File - How to compress a file in GZIP format)

Thursday 24 November 2016

Java Tutorial : Java IO (Java File - How to compress a file in GZIP format)

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Java Tutorial : Java IO (Java File - How to compress a file in GZIP format)

GZipDemo.java

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

public class GZipDemo
{

    public static void main(String[] args) throws IOException
    {
        String outputGzipFile = "D:/work/Helloworld.gz";
        String sourceFile = "D:/work/Helloworld.java";

        GZipDemo gzipDemo = new GZipDemo();
        gzipDemo.gzipIt(outputGzipFile, sourceFile);
    }

    public void gzipIt(String gzipFile, String sourceFile) throws IOException
    {

        byte[] buffer = new byte[1024];

        /*
         * If the Streams are within the
         * "try-With-Resources" block, then it will be
         * closed automatically.
         */
        try (
                FileOutputStream fos = new FileOutputStream(gzipFile);
                GZIPOutputStream gzos = new GZIPOutputStream(fos);
                FileInputStream fin = new FileInputStream(sourceFile);)
        {

            int len;
            while ((len = fin.read(buffer)) > 0)
            {
                gzos.write(buffer, 0, len);
            }

            gzos.finish();

            System.out.println("Gzip compression has been done..");

        }

    }
}