MD5/SHA-1/SHA-256

    /**
     * MD5
     */
    public static final String MD5 = "MD5";

    /**
     * SHA-1
     */
    public static final String SHA1 = "SHA-1";

    /**
     * SHA-256
     */
    public static final String SHA256 = "SHA-256";

    /**
     * 
     * 对字符串根据摘要名进行摘要。可支持MD5,SHA-1,SHA-256,默认SHA-256
     * 
     * @param encName 摘要名
     * @param strSrc 摘要目标字符串
     * @return 摘要结果字符串
     */
    public static String encrypt(String encName, final String strSrc)
    {
        MessageDigest md = null;
        String strDes = null;

        byte[] bt = strSrc.getBytes();
        try
        {
            if (encName == null || encName.equals(""))
            {
                encName = "SHA-256";
            }
            md = MessageDigest.getInstance(encName);
            md.update(bt);
            // to HexString
            strDes = bytes2Hex(md.digest());
        }
        catch (NoSuchAlgorithmException e)
        {
            return null;
        }
        return strDes;
    }

    /**
     * 将byte数组转为16进制表示的字符串
     * 
     * @param bts 源数组
     * @return 16进制表示的字符串
     */
    public static String bytes2Hex(byte[] bts)
    {
        String des = "";
        String tmp = null;
        for (int i = 0; i < bts.length; i++)
        {
            tmp = Integer.toHexString(bts[i] & 0xFF);
            if (tmp.length() == 1)
            {
                des += "0";
            }
            des += tmp;
        }
        return des;
    }