ThinkJava-压缩

// {Args: GZIPcompress.java}
package com.java.io;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GZIPcompress {
      public static void main(String[] args) throws IOException {
        if(args.length == 0) {
          System.out.println(
            "Usage: \nGZIPcompress file\n" +
            "\tUses GZIP compression to compress " +
            "the file to test.gz");
          System.exit(1);
        }
        BufferedReader in = new BufferedReader(new FileReader(args[0]));
        BufferedOutputStream out = new BufferedOutputStream(
                                          new GZIPOutputStream(
                                            new FileOutputStream("test.gz")));
        System.out.println("Writing file");
        int c;
        while((c = in.read()) != -1){
            out.write(c);
        }
        in.close();
        out.close();
        System.out.println("Reading file");
        BufferedReader in2 = new BufferedReader(
                                  new InputStreamReader(new GZIPInputStream(
                                    new FileInputStream("test.gz"))));
        String s;
        while((s = in2.readLine()) != null){
            System.out.println(s);
        }
        in2.close();
      }
}