压缩字节数组

//from 时   代    Java - nowjava.com

/**

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

//package com.nowjava;


import java.util.zip.Deflater;


import java.io.*;


public class Main {

    public static void main(String[] argv) throws Exception {

        byte[] input = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };

        System.out.println(java.util.Arrays.toString(compress(input)));

    }


    public static byte[] compress(byte[] input) throws IOException {/** 时   代    Java - nowjava.com 提供 **/

        // Create an expandable byte array to hold the compressed data.

        // You cannot use an array that's the same size as the orginal because

        // there is no guarantee that the compressed data will be smaller than

        // the uncompressed data.

        ByteArrayOutputStream bos = new ByteArrayOutputStream(input.length);

        compressToStream(input, bos);

        bos.close();


        // Get the compressed data

        return bos.toByteArray();

    }


    public static void compressToStream(byte[] input,

            ByteArrayOutputStream bos) throws IOException {

        // Create the compressor with highest level of compression

        Deflater compressor = new Deflater();

        compressor.setLevel(Deflater.BEST_COMPRESSION);


        // Give the compressor the data to compress

        compressor.setInput(input);

        compressor.finish();


        // Write the compressed data to the stream

        byte[] buf = new byte[1024];

        while (!compressor.finished()) {

            int count = compressor.deflate(buf);

            bos.write(buf, 0, count);

        }

    }