変換暗号化ツールクラス-MD 5

/** *         */
public class MD5 {
    private final static String[] hexDigits = {"0", "1", "2", "3", "4", "5", "6", "7",
            "8", "9", "a", "b", "c", "d", "e", "f"};

    /** *        16     * @param b      * @return 16     */
    public static String byteArrayToHexString(byte[] b) {
        StringBuilder resultSb = new StringBuilder();
        for (byte aB : b) {
            resultSb.append(byteToHexString(aB));
        }
        return resultSb.toString();
    }

    /** *   byte 16   * @param b     byte * @return 16     */
    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0) {
            n = 256 + n;
        }
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    /** * MD5   * @param origin       * @return   MD5        */
    public static String MD5Encode(String origin) {
        String resultString = null;
        try {
            resultString = origin;
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(resultString.getBytes("UTF-8"));
            resultString = byteArrayToHexString(md.digest());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return resultString;
    }

}