package com.yangxiaozuo.util;

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

/**
* ZLib壓縮工具
*??
* @author 梁棟
* @version 1.0
* @since 1.0
*/
public abstract class ZLibUtils {??

??? /**
???? * 壓縮
???? *??
???? * @param data
???? *??????????? 待壓縮數據
???? * @return byte[] 壓縮后的數據
???? */
??? 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;??
??? }??

??? /**
???? * 解壓縮
???? *??
???? * @param data
???? *??????????? 待壓縮的數據
???? * @return byte[] 解壓縮后的數據
???? */
??? 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("輸入字符串:\t" + inputStr);??
???????? byte[] input = inputStr.getBytes();??
???????? System.err.println("輸入字節長度:\t" + input.length);??
??
???????? byte[] data = ZLibUtils.compress(input);??
???????? System.err.println("壓縮后字節長度:\t" + data.length);??
??
???????? byte[] output = ZLibUtils.decompress(data);??
???????? System.err.println("解壓縮后字節長度:\t" + output.length);??
???????? String outputStr = new String(output);??
???????? System.err.println("輸出字符串:\t" + outputStr);??
??? }
}

轉載于:https://www.cnblogs.com/coolattt/archive/2010/01/06/1640614.html

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