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Java Source | 2000-05-25 | 4.5 KB | 119 lines |
- //: ZipCompress.java
- //////////////////////////////////////////////////
- // Copyright (c) Bruce Eckel, 1998
- // Source code file from the book "Thinking in Java"
- // All rights reserved EXCEPT as allowed by the
- // following statements: You can freely use this file
- // for your own work (personal or commercial),
- // including modifications and distribution in
- // executable form only. Permission is granted to use
- // this file in classroom situations, including its
- // use in presentation materials, as long as the book
- // "Thinking in Java" is cited as the source.
- // Except in classroom situations, you cannot copy
- // and distribute this code; instead, the sole
- // distribution point is http://www.BruceEckel.com
- // (and official mirror sites) where it is
- // freely available. You cannot remove this
- // copyright and notice. You cannot distribute
- // modified versions of the source code in this
- // package. You cannot use this file in printed
- // media without the express permission of the
- // author. Bruce Eckel makes no representation about
- // the suitability of this software for any purpose.
- // It is provided "as is" without express or implied
- // warranty of any kind, including any implied
- // warranty of merchantability, fitness for a
- // particular purpose or non-infringement. The entire
- // risk as to the quality and performance of the
- // software is with you. Bruce Eckel and the
- // publisher shall not be liable for any damages
- // suffered by you or any third party as a result of
- // using or distributing software. In no event will
- // Bruce Eckel or the publisher be liable for any
- // lost revenue, profit, or data, or for direct,
- // indirect, special, consequential, incidental, or
- // punitive damages, however caused and regardless of
- // the theory of liability, arising out of the use of
- // or inability to use software, even if Bruce Eckel
- // and the publisher have been advised of the
- // possibility of such damages. Should the software
- // prove defective, you assume the cost of all
- // necessary servicing, repair, or correction. If you
- // think you've found an error, please email all
- // modified files with clearly commented changes to:
- // Bruce@EckelObjects.com. (Please use the same
- // address for non-code errors found in the book.)
- /////////////////////////////////////////////////
-
- // Uses Java 1.1 Zip compression to compress
- // any number of files whose names are passed
- // on the command line.
- import java.io.*;
- import java.util.*;
- import java.util.zip.*;
-
- public class ZipCompress {
- public static void main(String[] args) {
- try {
- FileOutputStream f =
- new FileOutputStream("test.zip");
- CheckedOutputStream csum =
- new CheckedOutputStream(
- f, new Adler32());
- ZipOutputStream out =
- new ZipOutputStream(
- new BufferedOutputStream(csum));
- out.setComment("A test of Java Zipping");
- // Can't read the above comment, though
- for(int i = 0; i < args.length; i++) {
- System.out.println(
- "Writing file " + args[i]);
- BufferedReader in =
- new BufferedReader(
- new FileReader(args[i]));
- out.putNextEntry(new ZipEntry(args[i]));
- int c;
- while((c = in.read()) != -1)
- out.write(c);
- in.close();
- }
- out.close();
- // 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("test.zip");
- CheckedInputStream csumi =
- new CheckedInputStream(
- fi, new Adler32());
- ZipInputStream in2 =
- new ZipInputStream(
- new BufferedInputStream(csumi));
- ZipEntry ze;
- System.out.println("Checksum: " +
- csumi.getChecksum().getValue());
- while((ze = in2.getNextEntry()) != null) {
- System.out.println("Reading file " + ze);
- int x;
- while((x = in2.read()) != -1)
- System.out.write(x);
- }
- in2.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();
- System.out.println("File: " + ze2);
- // ... and extract the data as before
- }
- } catch(Exception e) {
- e.printStackTrace();
- }
- }
- } ///:~