1.     /**
    2.      * md5或者sha-1加密
    3.      *
    4.      * @param inputText
    5.      *            要加密的内容
    6.      * @param algorithmName
    7.      *            加密算法名称：md5或者sha-1，不区分大小写
    8.      * @return
    9.      */
    10.     private static String encrypt(String inputText, String algorithmName) {
    11.         String encryptText = null;
    13.         if (inputText == null || "".equals(inputText.trim())) {
    14.             return encryptText;
    15.         }
    16.         if (algorithmName == null || "".equals(algorithmName.trim())) {
    17.             algorithmName = "sha-1";
    18.         }
    20.         try {
    21.             MessageDigest m = MessageDigest.getInstance(algorithmName);
    22.             m.update(inputText.getBytes());
    23.             byte s[] = m.digest();
    24.             return hex(s);
    25.         } catch (NoSuchAlgorithmException e) {
    26.             e.printStackTrace();
    27.         }
    29.         return encryptText;
    30.     }
    32.     // 返回十六进制字符串
    33.     private static String hex(byte[] arr) {
    34.         StringBuffer sb = new StringBuffer();
    35.         for (int i = 0; i < arr.length; ++i) {
    36.             sb.append(Integer.toHexString((arr[i] & 0xFF) | 0x100).substring(1,
    37.                     3));
    38.         }
    39.         return sb.toString();
    40.     }