MD5/SHA-一/SHA-256

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;    }