MD5 加密

package com.weshop.core.util;import java.security.MessageDigest;public class MD5 {public static void main(String[] args) {System.out.println(md5("111111"));}public static String md5(String str) {char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9','a', 'b', 'c', 'd', 'e', 'f' };try {byte[] bytes = str.getBytes();MessageDigest messageDigest = MessageDigest.getInstance("MD5");messageDigest.update(bytes);byte[] updateBytes = messageDigest.digest();int len = updateBytes.length;char myChar[] = new char[len * 2];int k = 0;for (int i = 0; i < len; i++) {byte byte0 = updateBytes[i];myChar[k++] = hexDigits[byte0 >>> 4 & 0x0f];myChar[k++] = hexDigits[byte0 & 0x0f];}return new String(myChar);} catch (Exception e) {return null;}}}