code: public static String decryptContent(String content, String encryptType, String encryptKey,
                                          String charset) throws AlipayApiException {
  
          if (AES_ALG.equals(encryptType)) {
  
              return aesDecrypt(content, encryptKey, charset);
  
          } else {
  
              throw new AlipayApiException("当前不支持该算法类型：encrypeType=" + encryptType);
          }
  
      }
docs: 解密
  
  @param content
  @param encryptType
  @param encryptKey
  @param charset
  @return
  @throws AlipayApiException