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//: io/ZipCompress.java

// Uses Zip compression to compress any

// number of files given on the command line.

// {Args: ZipCompress.java}

import java.util.zip.*;

import java.io.*;

import java.util.*;

import static net.mindview.util.Print.*;

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("A test of Java Zipping");

// No corresponding getComment(), though.

for(String arg : args) {

print("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 valid only after the file has been closed!

print("Checksum: " + csum.getChecksum().getValue());

// Now extract the files:

print("Reading file");

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

CheckedInputStream csumi =

new CheckedInputStream(fi, new Adler32());

ZipInputStream in2 = new ZipInputStream(csumi);

BufferedInputStream bis = new BufferedInputStream(in2);

ZipEntry ze;

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

print("Reading file " + ze);

int x;

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

System.out.write(x);

}

if(args.length == 1)

print("Checksum: " + csumi.getChecksum().getValue());

bis.close();

// Alternative way to open and read Zip files:

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

Enumeration e = zf.entries();

while(e.hasMoreElements()) {

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

print("File: " + ze2);

// ... and extract the data as before

}

/* if(args.length == 1) */

}

} /* (Execute to see output) *///:~