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public interface Service {

    public static final String XML_TAG = "WebService";

   /**
    * 返回该服务所附带的OP参数
    *
    * @return op参数
    */
   public String actionOP();

   /**
    * 处理HTTP请求
    *
    * @param req       HTTP请求
    * @param res       HTTP响应
    * @param op        op参数值
    * @param sessionID 当前广义报表对象的会话ID
    * @throws Exception
    */
   public void process(HttpServletRequest req, HttpServletResponse res, String op, String sessionID) throws Exception;
}