java.util.zip.Deflater 压缩 inflater解压 实例

原文:java压缩解压缩类实例[转]

package com.example.helloworld;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;

/**
 * ZLib压缩工具
 *
 * @author 梁栋
 * @version 1.0
 * @since 1.0
 */
public abstract class Utils {

    /**
     * 压缩
     *
     * @param data 待压缩数据
     * @return byte[] 压缩后的数据
     */
    public static byte[] compress(byte[] data) {
        byte[] output = new byte[0];

        Deflater compresser = new Deflater();

        compresser.reset();
        compresser.setInput(data);
        compresser.finish();
        ByteArrayOutputStream bos = new ByteArrayOutputStream(data.length);
        try {
            byte[] buf = new byte[1024];
            while (!compresser.finished()) {
                int i = compresser.deflate(buf);
                bos.write(buf, 0, i);
            }
            output = bos.toByteArray();
        } catch (Exception e) {
            output = data;
            e.printStackTrace();
        } finally {
            try {
                bos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        compresser.end();
        return output;
    }

    /**
     * 解压缩
     *
     * @param data 待压缩的数据
     * @return byte[] 解压缩后的数据
     */
    public static byte[] decompress(byte[] data) {
        byte[] output = new byte[0];

        Inflater decompresser = new Inflater();
        decompresser.reset();
        decompresser.setInput(data);

        ByteArrayOutputStream o = new ByteArrayOutputStream(data.length);
        try {
            byte[] buf = new byte[1024];
            while (!decompresser.finished()) {
                int i = decompresser.inflate(buf);
                o.write(buf, 0, i);
            }
            output = o.toByteArray();
        } catch (Exception e) {
            output = data;
            e.printStackTrace();
        } finally {
            try {
                o.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        decompresser.end();
        return output;
    }

    public static void main(String[] args) {
        String inputStr = "snowolf@zlex.org;dongliang@zlex.org;zlex.dongliang@zl";
        System.err.println("输入字符串:\t" + inputStr);
        byte[] input = inputStr.getBytes();
        System.err.println("输入字节长度:\t" + input.length);

        byte[] data = Utils.compress(input);
        System.err.println("压缩后字节长度:\t" + data.length);

        byte[] output = Utils.decompress(data);
        System.err.println("解压缩后字节长度:\t" + output.length);
        String outputStr = new String(output);
        System.err.println("输出字符串:\t" + outputStr);
    }
}