Android中的MD5加密

[java] view plaincopy

/*
* MD5加密
*/
  private String getMD5Str(String str) {
      MessageDigest messageDigest = null;

      try {
          messageDigest = MessageDigest.getInstance("MD5");

          messageDigest.reset();

          messageDigest.update(str.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().toUpperCase();
  }