MD5加密算法

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package com.tools.encrypt;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/** *  * @ClassName:     MD5Encrypt * @Description:TODO(MD5不可逆加密，密码不可解) * @author:    chenanzhi * @date:        2015-1-6 下午05:26:07 * */public class MD5Encrypt {public static final String ALGORITHM = "MD5";public static final String HANDLE = "my_tools_md5_encrypt"; //句柄// 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 MD5Encrypt() {    }    // 返回形式为数字跟字符串    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];    }    // 返回形式只为数字    private static String byteToNum(byte bByte) {        int iRet = bByte;        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();    }    /**     *      * @Title: GetMD5Code     * @Description: TODO(MD5加密)     * @param: @param strObj     * @param: @return        * @return: String        * @throws     */    public static String GetMD5Code(String strObj) {    strObj = strObj+HANDLE;        String resultString = null;        try {            resultString = new String(strObj);            MessageDigest md = MessageDigest.getInstance(ALGORITHM);            // 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;    }}
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