MD5加密工具类

package com.Secret;import java.security.MessageDigest;public class Encryption {    public final static String MD5(String pwd) {        char md5String[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',                'A', 'B', 'C', 'D', 'E', 'F' };        try {            byte[] btInput = pwd.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++] = md5String[byte0 >>> 4 & 0xf];                str[k++] = md5String[byte0 & 0xf];            }            return new String(str);        } catch (Exception e) {            return null;        }    }    public static void main(String[] args) {        System.out.println(MD5("你好密传无视 哦了卡门薮猫；吗，杀到了昆明").length());    }}