Zip files in Java

To create or read zip files in Java, we can use java.util.ZipFile. This allow to read an zip file and read the entries inside it. We can create a zip file by using ZipOutputStream.

Please refer the below example program

https://github.com/pallabrath/myexpjava/blob/master/myexpjava/src/demo/zipfile/ZipFileDemo.java

package demo.zipfile;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.Enumeration;

import java.util.Scanner;

import java.util.zip.ZipEntry;

import java.util.zip.ZipFile;

import java.util.zip.ZipOutputStream;

public class ZipFileDemo {

public static void main(String args[]) throws IOException {

// create a zip file

String zipFileName = "D:\\demo.zip";

ZipOutputStream zipos = new ZipOutputStream(new FileOutputStream(zipFileName));

// In Zip Output Stream we can create file.

ZipEntry ze1 = new ZipEntry("file1.txt");

zipos.putNextEntry(ze1);

zipos.write("Hello World".getBytes());

zipos.closeEntry();

// Now lets create another file in a directory

zipos.putNextEntry(new ZipEntry("etc\\file2.txt"));

zipos.write("Hello Again".getBytes());

zipos.closeEntry();

zipos.close();

// To Read Zip file

ZipFile zipFile = new ZipFile(zipFileName);

// for specific entry

ZipEntry ze2 = zipFile.getEntry("file1.txt");

InputStream is = zipFile.getInputStream(ze2);

Scanner scan = new Scanner(is);

while (scan.hasNextLine()){

System.out.println(scan.nextLine());

}

scan.close();

Enumeration enm = zipFile.entries();

while(enm.hasMoreElements()) {

ZipEntry ze = (ZipEntry) enm.nextElement();

System.out.println(ze.getName());

}

}

}