MD5加密

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引入JDK1.6 （rt.jar）

package com.zz.utils;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/** * Encodes a string using MD5 hashing  *  * @author Rafael Steil * @version $Id: MD5.java,v 1.7 2006/08/23 02:13:44 rafaelsteil Exp $ */public class MD5 {/** * Encodes a string *  * @param str String to encode * @return Encoded String * @throws NoSuchAlgorithmException */public static String crypt(String str){if (str == null || str.length() == 0) {throw new IllegalArgumentException("String to encript cannot be null or zero length");}StringBuffer hexString = new StringBuffer();try {MessageDigest md = MessageDigest.getInstance("MD5");md.update(str.getBytes());byte[] hash = md.digest();for (int i = 0; i < hash.length; i++) {if ((0xff & hash[i]) < 0x10) {hexString.append("0" + Integer.toHexString((0xFF & hash[i])));}else {hexString.append(Integer.toHexString(0xFF & hash[i]));}}}catch (NoSuchAlgorithmException e) {throw new RuntimeException("" + e);}return hexString.toString();}}

建test类测试下：

public class Test {public static void main(String[] args) {System.out.println(MD5.crypt("123"));}}