package io;

import java.io.*;

import java.util.zip.*;

import java.util.*;

/**

* RUN:

* javac io/ZipCompress.java && java io.ZipCompress io/ZipCompress.java

*

* OUTPUT:

*

*/

public class ZipCompress {

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

FileOutputStream f = new FileOutputStream("test.zip");

CheckedOutputStream csum = new CheckedOutputStream(f, new Adler32());

ZipOutputStream zos = new ZipOutputStream(csum);

BufferedOutputStream out = new BufferedOutputStream(zos);

zos.setComment("Check ZIP-compressing Java"); // but Java have no method getComment()

for (String arg : args) {

System.out.println("Writing file " + arg);

BufferedReader in = new BufferedReader(new FileReader(arg));

zos.putNextEntry(new ZipEntry(arg));

int c;

while ((c = in.read()) != -1) {

out.write(c);

}

in.close();

out.flush();

}

out.close();

// Checksum is availabel ONLY after zip file closing !

System.out.println("Checksum " + csum.getChecksum().getValue());

// Unziping archive

System.out.println("Reading zip-file");

FileInputStream fi = new FileInputStream("test.zip");

CheckedInputStream csum1 = new CheckedInputStream(fi, new Adler32());

ZipInputStream in2 = new ZipInputStream(csum1);

BufferedInputStream bis = new BufferedInputStream(in2);

ZipEntry ze;

while ((ze = in2.getNextEntry()) != null) {

System.out.println("Reading file " + ze);

int x;

while ((x = bis.read()) != -1) {

System.out.write(x);

}

}

if (args.length == 1) {

System.out.println("\nChecksum: " + csum1.getChecksum().getValue());

}

bis.close();

System.out.println();

System.out.println("Alternate method reading zip=files");

System.out.println();

// Alternate method reading zip=files

ZipFile zf = new ZipFile("test.zip");

Enumeration e = zf.entries();

while (e.hasMoreElements()) {

ZipEntry ze2 = (ZipEntry)e.nextElement();

System.out.println("File: " + ze2);

InputStream input = zf.getInputStream(ze2);

int x;

while ((x = input.read()) != -1) {

System.out.write(x);

}

input.close();

}

zf.close();

}

}