MD5Util

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package com.cc.hkjc.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5Util {
    private final static String[] strDigits = { "0", "1", "2", "3", "4", "5",
         "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
 public MD5Util() {
 }

 private static String byteToArrayString(byte bByte) {
     int iRet = bByte;
     if (iRet < 0) {
         iRet += 256;
     }
     int iD1 = iRet / 16;
     int iD2 = iRet % 16;
     return strDigits[iD1] + strDigits[iD2];
 }

 private static String byteToNum(byte bByte) {
     int iRet = bByte;
     System.out.println("iRet1=" + iRet);
     if (iRet < 0) {
         iRet += 256;
     }
     return String.valueOf(iRet);
 }

 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 SetMD5(String strObj) {
     String resultString = null;
     try {
         resultString = new String(strObj);
         MessageDigest md = MessageDigest.getInstance("MD5");
         resultString = byteToString(md.digest(strObj.getBytes()));
     } catch (NoSuchAlgorithmException ex) {
         ex.printStackTrace();
     }
     return resultString;
 }

 public static void main(String[] args) {
     MD5Util getMD5 = new MD5Util();
     System.out.println(getMD5.SetMD5("123456"));
 }

}

MD5Util

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原文地址：http://www.cnblogs.com/strive-study/p/5161755.html