1.Controller.java

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

* ⾃定义接⼝，实现管理多个请求,在模拟Spring MVC中的控制器

*/

        public interface Controller {

                String handleRequest(HttpServletRequest request,

                HttpServletResponse response);

        }

2.DispatcherServlet.java负责将多个请求分发给各⾃不同的控制器

@WebServlet(urlPatterns = {"/ProductInput", "/ProductDetail"})

public class DispatcherServlet extends HttpServlet {protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {

    String requestURI = request.getRequestURI();

    String action =requestURI.substring(requestURI.lastIndexOf("/") + 1);

    Controller controller = null;

    if("ProductInput".equalsIgnoreCase(action)){

            controller = new ProductInputController();

    }else if("ProductDetail".equalsIgnoreCase(action)){

        controller = new ProductDetailController();

    }

    String url = controller.handleRequest(request, response);

    request.getRequestDispatcher(url).forward(request,response);

}

结论：多个请求可以交给同⼀个Servlet（DispatcherServlet），然后各⾃不同的请求会交给各

⾃的控制器。所有请求都叫个DispatcerServet，该⻆⾊相当于⼀个前端控制器，可以⼤⼤的提

⾼客户的以及服务器端的⼯作效率。