MD5加密

package com.neuedu.my12306.common;import java.security.MessageDigest;public class Md5Utils {public final static String md5(String s) {char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9','a', 'b', 'c', 'd', 'e', 'f' };try {byte[] btInput = s.getBytes();MessageDigest mdInst = MessageDigest.getInstance("MD5");mdInst.update(btInput);byte[] md = mdInst.digest();int j = md.length;char str[] = new char[j * 2];int k = 0;for (int i = 0; i < j; i++) {byte byte0 = md[i];str[k++] = hexDigits[byte0 >>> 4 & 0xf];str[k++] = hexDigits[byte0 & 0xf];}return new String(str);} catch (Exception e) {e.printStackTrace();return null;}}public static void main(String[] args) {System.out.println(md5("123456"));}}