code: public static String rsa(String string) throws InvalidKeyException, NoSuchAlgorithmException,
              NoSuchPaddingException, UnsupportedEncodingException, IllegalBlockSizeException, BadPaddingException {
          return cryptDES(string, Cipher.ENCRYPT_MODE, "RSA");
      }
docs: RSA加密
  
  @param string {@link String}
  
  @return {@link String}
  
  @throws BadPaddingException 异常
  @throws IllegalBlockSizeException 异常
  @throws UnsupportedEncodingException 异常
  @throws NoSuchPaddingException 异常
  @throws NoSuchAlgorithmException 异常
  @throws InvalidKeyException 异常