Java实现GZIP压缩与解压代码示例

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import java.util.zip.GZIPOutputStream;
02import java.io.FileOutputStream;
03import java.io.FileInputStream;
04import java.io.FileNotFoundException;
05import java.io.IOException;
06 
07/**
08 * -----------------------------------------------------------------------------
09 * Used to provide an example of compressing a file using the GZIP Format.
10 *
11 * @version 1.0
12 * @author  Jeffrey M. Hunter  (jhunter@idevelopment.info)
13 * @author  http://www.idevelopment.info
14 * -----------------------------------------------------------------------------
15 */
16 
17public class CompressFileGZIP {
18 
19    /**
20     * Perform file compression.
21     * @param inFileName Name of the file to be compressed
22     */
23    private static void doCompressFile(String inFileName) {
24 
25        try {
26        
27            System.out.println("Creating the GZIP output stream.");
28            String outFileName = inFileName + ".gz";
29            GZIPOutputStream out = null;

30            try {
31                out = new GZIPOutputStream(new FileOutputStream(outFileName));
32            } catch(FileNotFoundException e) {
33                System.err.println("Could not create file: " + outFileName);
34                System.exit(1);
35            }
36                    
37 
38            System.out.println("Opening the input file.");
39            FileInputStream in = null;
40            try {
41                in = new FileInputStream(inFileName);
42            } catch (FileNotFoundException e) {
43                System.err.println("File not found. " + inFileName);
44                System.exit(1);
45            }
46 
47            System.out.println("Transfering bytes from input file to GZIP Format.");
48            byte[] buf = new byte[1024];
49            int len;
50            while((len = in.read(buf)) > 0) {
51                out.write(buf, 0, len);
52            }
53            in.close();
54 
55            System.out.println("Completing the GZIP file");
56            out.finish();
57            out.close();
58        
59        } catch (IOException e) {