Servlet的体系结构

Servlet的体系结构

Timber 1,698 2020-11-19

Servlet的体系结构

Servlet -- 接口

      |

GenericServlet -- 抽象类

/*
    将Servlet中其他的方法做了默认的空实现，只将servlet（）方法作为抽象
    可以继承GenericServlet，实现service（）方法
*/
public class ServletDemo02 extends GenericServlet {

    @Override
    public void service(ServletRequest servletRequest, ServletResponse servletResponse)
            throws ServletException, IOException {
        System.out.println("demo02....");
    }

      |

HttpServlet -- 抽象类

/*
    对http协议的一种封装，简化操作。
 */
@WebServlet("/demo03")
public class ServletDemo03 extends HttpServlet {

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.service(req, resp);
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        super.doGet(req, resp);

        System.out.println("get....启动");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        super.doPost(req, resp);
        System.out.println("post...启动");
    }
}
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