code: private String downJson(String url) {
          // 构造HttpClient的实例
          HttpClient httpClient = new HttpClient();
          // 创建GET方法的实例
          GetMethod method = new GetMethod(url);
          try {
              // 执行GetMethod
              int statusCode = httpClient.executeMethod(method);
              LOGGER.info("响应代码：" + statusCode);
              if (statusCode != HttpStatus.SC_OK) {
                  LOGGER.error("请求失败: " + method.getStatusLine());
              }
              // 读取内容
              String responseBody = new String(method.getResponseBody(), "utf-8");
              return responseBody;
          } catch (IOException e) {
              LOGGER.error("检查请求的路径：" + url, e);
          } finally {
              // 释放连接
              method.releaseConnection();
          }
          return "";
      }
docs: 从配置管理WEB服务器下载规则（json表示）
  
  @param url 配置管理WEB服务器下载规则的地址
  @return json字符串