package com.happigo.test;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/* * MD5 算法*/public class MD5 {        // 全局数组    private final static String[] strDigits = { "0", "1", "2", "3", "4", "5",            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };    public MD5() {    }    // 返回形式为数字跟字符串    private static String byteToArrayString(byte bByte) {        int iRet = bByte;        // System.out.println("iRet="+iRet);        if (iRet < 0) {            iRet += 256;        }        int iD1 = iRet / 16;        int iD2 = iRet % 16;        return strDigits[iD1] + strDigits[iD2];    }    // 返回形式只为数字    private static String byteToNum(byte bByte) {        int iRet = bByte;        System.out.println("iRet1=" + iRet);        if (iRet < 0) {            iRet += 256;        }        return String.valueOf(iRet);    }    // 转换字节数组为16进制字串    private static String byteToString(byte[] bByte) {        StringBuffer sBuffer = new StringBuffer();        for (int i = 0; i < bByte.length; i++) {            sBuffer.append(byteToArrayString(bByte[i]));        }        return sBuffer.toString();    }    public static String GetMD5Code(String strObj) {        String resultString = null;        try {            resultString = new String(strObj);            MessageDigest md = MessageDigest.getInstance("MD5");            // md.digest(); //该函数返回值为存放哈希值结果的byte数组            resultString = byteToString(md.digest(strObj.getBytes()));        } catch (NoSuchAlgorithmException ex) {            ex.printStackTrace();        }        return resultString;    }    public static void main(String[] args) {        MD5 getMD5 = new MD5();        System.out.println(getMD5.GetMD5Code("123456"));    }}