Compress and Uncompress in Java

Compressing a File in the GZIP Format：

try {
     // Create the GZIP output stream
    String outFilename = " outfile.gzip " ;
    GZIPOutputStream out = new GZIPOutputStream( new FileOutputStream(outFilename));

     // Open the input file
    String inFilename = " infilename " ;
    FileInputStream in = new FileInputStream(inFilename);

     // Transfer bytes from the input file to the GZIP output stream
     byte [] buf = new byte [ 1024 ];
     int len;
     while ((len = in.read(buf)) > 0 ) {
        out.write(buf, 0 , len);
    }
    in.close();

     // Complete the GZIP file
    out.finish();
    out.close();
} catch (IOException e) {
}

Uncompressing a File in the GZIP Format：

try {
     // Open the compressed file
    String inFilename = " infile.gzip " ;
    GZIPInputStream in = new GZIPInputStream( new FileInputStream(inFilename));

     // Open the output file
    String outFilename = " outfile " ;
    OutputStream out = new FileOutputStream(outFilename);

     // Transfer bytes from the compressed file to the output file
     byte [] buf = new byte [ 1024 ];
     int len;
     while ((len = in.read(buf)) > 0 ) {
        out.write(buf, 0 , len);
    }

     // Close the file and stream
    in.close();
    out.close();
} catch (IOException e) {
}

Creating a ZIP File:

// These are the files to include in the ZIP file
String[] filenames = new String[]{ " filename1 " , " filename2 " };

// Create a buffer for reading the files
byte [] buf = new byte [ 1024 ];

try {
     // Create the ZIP file
    String outFilename = " outfile.zip " ;
    ZipOutputStream out = new ZipOutputStream( new FileOutputStream(outFilename));

     // Compress the files
     for ( int i = 0 ; i < filenames.length; i ++ ) {
        FileInputStream in = new FileInputStream(filenames[i]);

         // Add ZIP entry to output stream.
        out.putNextEntry( new ZipEntry(filenames[i]));

         // Transfer bytes from the file to the ZIP file
         int len;
         while ((len = in.read(buf)) > 0 ) {
            out.write(buf, 0 , len);
        }

         // Complete the entry
        out.closeEntry();
        in.close();
    }

     // Complete the ZIP file
    out.close();
} catch (IOException e) {
}

Listing the Contents of a ZIP File:

try {
     // Open the ZIP file
    ZipFile zf = new ZipFile( " filename.zip " );

     // Enumerate each entry
     for (Enumeration entries = zf.entries(); entries.hasMoreElements();) {
         // Get the entry name
        String zipEntryName = ((ZipEntry)entries.nextElement()).getName();
    }
} catch (IOException e) {
}

Retrieving a Compressed File from a ZIP File:

try {
     // Open the ZIP file
    String inFilename = " infile.zip " ;
    ZipInputStream in = new ZipInputStream( new FileInputStream(inFilename));

     // Get the first entry
    ZipEntry entry = in.getNextEntry();

     // Open the output file
    String outFilename = " o " ;
    OutputStream out = new FileOutputStream(outFilename);

     // Transfer bytes from the ZIP file to the output file
     byte [] buf = new byte [ 1024 ];
     int len;
     while ((len = in.read(buf)) > 0 ) {
        out.write(buf, 0 , len);
    }

     // Close the streams
    out.close();
    in.close();
} catch (IOException e) {
}

posted on 2008-06-03 23:02 zJun's帛罗阁阅读(1340) 评论(1) 编辑收藏所属分类: Java基础

# re: Compress and Uncompress in Java 2009-12-20 05:54 Krista22

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# re: Compress and Uncompress in Java 2009-12-20 05:54 Krista22

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