«
»

How to GUnzip Files with Java

A common thing to do is to zip files. This combines multiple files into one so it is easier to transport them. It also is helpful because it compresses the files into a smaller size. One utility that is common in Unix/Linux is gzip. The following Java code shows how you would unzip files that have been gzipped. Please note that it assumes the file has a .gz extension and that it deletes the original file after unzipping the contents.

import java.util.zip.*;
import java.io.*;
 
...
 
public static String Unzip(String inFilePath) throws Exception
{
    GZIPInputStream gzipInputStream = new GZIPInputStream(new FileInputStream(inFilePath));
 
    String outFilePath = inFilePath.replace(".gz", "");
    OutputStream out = new FileOutputStream(outFilePath);
 
    byte[] buf = new byte[1024];
    int len;
    while ((len = gzipInputStream.read(buf)) > 0)
        out.write(buf, 0, len);
 
    gzipInputStream.close();
    out.close();
 
    new File(inFilePath).delete();
 
    return outFilePath;
}

Note: I borrowed some of this code from here.

This entry was posted on Wednesday, December 3rd, 2008 at 12:58 pm and is filed under Java, Tip. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

One Response to “How to GUnzip Files with Java”

  1. Yeah! Thanks for the code!

Leave a Reply