Jan 252017

ADM

How to decompress files from ZIP format using Java

  • 25 January 2017
  • ADM

 

 

 

How to decompress files from ZIP format using Java - images/logos/java.jpg

 

After we saw How to compress files in ZIP format using Java, here will see how to decompress files from ZIP format archive.

Example

package com.admfactory.io.archive;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class UnzipArchive {

    public static void main(String[] args) {

	String source = "D:\\admfactory.com\\archive.zip";
	String output = "D:\\admfactory.com\\dir10\\";

	System.out.println("UnZip Archive Example");
	System.out.println();
	System.out.println("Output to: " + output);
	System.out.println();

	unzip(source, output);
    }

    /**
     * Zip the list received as parameter
     * 
     * @param zipFile
     *            output ZIP file location
     */
    public static void unzip(String zipFile, String output) {

	byte[] buffer = new byte[1024];

	try {

	    /** create output directory is not exists */
	    File folder = new File(output);
	    if (!folder.exists()) {
		folder.mkdirs();
	    }

	    /** get the zip file content */
	    ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile));
	    
	    /** get the first zip file entry */
	    ZipEntry ze = zis.getNextEntry();

	    while (ze != null) {

		String fileName = ze.getName();
		File newFile = new File(output + File.separator + fileName);

		System.out.println("file unzip: " + newFile.getAbsolutePath());

		/** create all non exists parent folders */
		newFile.getParentFile().mkdirs();

		FileOutputStream fos = new FileOutputStream(newFile);

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

		fos.close();
		
		/** get the next zip file entry */
		ze = zis.getNextEntry();
	    }

	    zis.closeEntry();
	    zis.close();
	    System.out.println();
	    System.out.println("Done!");

	} catch (IOException ex) {
	    ex.printStackTrace();
	}
    }

}

Output

UnZip Archive Example

Output to: D:\admfactory.com\dir10\

file unzip: D:\admfactory.com\dir10\dir3\dir4\f6.txt
file unzip: D:\admfactory.com\dir10\dir3\dir4\f7.txt
file unzip: D:\admfactory.com\dir10\dir3\f4.txt
file unzip: D:\admfactory.com\dir10\dir3\f5.txt
file unzip: D:\admfactory.com\dir10\f1.txt
file unzip: D:\admfactory.com\dir10\f2.txt
file unzip: D:\admfactory.com\dir10\f3.txt

Done!

 

 

 

References