Uses Zip compression to compress any number of files given on the command line : Zip Tar File « File Input Output « Java

Uses Zip compression to compress any number of files given on the command line

// :
// Uses Zip compression to compress any
// number of files given on the command line.
// {Args:}
// {Clean:}
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// See copyright notice in CopyRight.txt.

import java.util.Enumeration;

public class ZipCompress {
  // Throw exceptions to console:
  public static void main(String[] args) throws IOException {
    FileOutputStream f = new FileOutputStream("");
    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 (int i = 0; i < args.length; i++) {
      System.out.println("Writing file " + args[i]);
      BufferedReader in = new BufferedReader(new FileReader(args[i]));
      zos.putNextEntry(new ZipEntry(args[i]));
      int c;
      while ((c = != -1)
    // Checksum valid only after the file has been closed!
    System.out.println("Checksum: " + csum.getChecksum().getValue());
    // Now extract the files:
    System.out.println("Reading file");
    FileInputStream fi = new FileInputStream("");
    CheckedInputStream csumi = new CheckedInputStream(fi, new Adler32());
    ZipInputStream in2 = new ZipInputStream(csumi);
    BufferedInputStream bis = new BufferedInputStream(in2);
    ZipEntry ze;
    while ((ze = in2.getNextEntry()) != null) {
      System.out.println("Reading file " + ze);
      int x;
      while ((x = != -1)
    System.out.println("Checksum: " + csumi.getChecksum().getValue());
    // Alternative way to open and read zip files:
    ZipFile zf = new ZipFile("");
    Enumeration e = zf.entries();
    while (e.hasMoreElements()) {
      ZipEntry ze2 = (ZipEntry) e.nextElement();
      System.out.println("File: " + ze2);
      // ... and extract the data as before
} ///:~


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