package cn.netjava.cngpclient.connection;import java.io.*;import java.security.*;import java.security.spec.*;/** * MD5摘要工具 * 中國網(wǎng)通短信網(wǎng)關(guān)客戶端--藍杰實訓項目 * @author www.NetJava.cn * */public class Md5 {	MessageDigest alg;	public Md5() {		try {			alg = MessageDigest.getInstance("MD5");		} catch (NoSuchAlgorithmException e) {		}	}	// 傳入要加密的字符串，此函數(shù)反回此串的16個字節(jié)的摘要密碼字符串	public String encrypt(String key) {		String m = key;		return computeDigest(m.getBytes());	}	public String computeDigest(byte[] b) {		try {			alg.reset();			alg.update(b);			byte[] hash = alg.digest(); // 得到摘要			String d = new String(hash, "ISO-8859-1");			return d;		} catch (Exception ex) {			return null;		}	}}