md5加密

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/* * MD5加密 */public static String getMD5Text(String text) {   if (TextUtils.isEmpty(text)) {      return null;   }   MessageDigest messageDigest = null;   try {      messageDigest = MessageDigest.getInstance("MD5");      messageDigest.reset();      messageDigest.update(text.getBytes("UTF-8"));   } catch (NoSuchAlgorithmException e) {      System.out.println("NoSuchAlgorithmException caught!");      System.exit(-1);   } catch (UnsupportedEncodingException e) {      e.printStackTrace();   }   byte[] byteArray = messageDigest.digest();   StringBuffer md5StrBuff = new StringBuffer();   for (int i = 0; i < byteArray.length; i++) {      if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)         md5StrBuff.append("0").append(               Integer.toHexString(0xFF & byteArray[i]));      else         md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));   }   // 16位加密，从第9位到25位   /*return md5StrBuff.substring(8, 24).toString().toLowerCase();*/   //32位加密   return md5StrBuff.toString().toLowerCase();}
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