java.util.zip.Deflater 壓縮 inflater解壓 執行個體

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原文:java壓縮解壓縮類執行個體[轉]

 

package com.example.helloworld;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.util.zip.Deflater;import java.util.zip.Inflater;/** * ZLib壓縮公用程式 * * @author 梁棟 * @version 1.0 * @since 1.0 */public abstract class Utils {    /**     * 壓縮     *     * @param data 待壓縮資料     * @return byte[] 壓縮後的資料     */    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 待壓縮的資料     * @return byte[] 解壓縮後的資料     */    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 = "[email protected];[email protected];[email protected]";        System.err.println("輸入字串:\t" + inputStr);        byte[] input = inputStr.getBytes();        System.err.println("輸入位元組長度:\t" + input.length);        byte[] data = Utils.compress(input);        System.err.println("壓縮後位元組長度:\t" + data.length);        byte[] output = Utils.decompress(data);        System.err.println("解壓縮後位元組長度:\t" + output.length);        String outputStr = new String(output);        System.err.println("輸出字串:\t" + outputStr);    }}

 

java.util.zip.Deflater 壓縮 inflater解壓 執行個體