顺便演示了MVC的作法，以后hello.view可以移交到jsp中处理。

而MODEL和CONTROL,VIEW就实现了分享。

 

 

HelloModel.java:

package cc.openhome;import java.util.*;public class HelloModel {    private Map
     
       messages =             new HashMap
      
       ();    public HelloModel() {        messages.put("caterpillar", "Hello");        messages.put("Justin", "Welcome");        messages.put("momor", "Hi");    }        public String doHello(String user) {        String message = messages.get(user);        System.out.println(message + "@@@@@@@@@@@@@@@@@");        return message + ", " + user + "!";    }}
      
     

HelloController.java:

package cc.openhome;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class HelloController */@WebServlet("/hello.do")public class HelloController extends HttpServlet {    private static final long serialVersionUID = 1L;    private HelloModel model = new HelloModel();           /**     * @see HttpServlet#HttpServlet()     */    public HelloController() {        super();        // TODO Auto-generated constructor stub    }    /**     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)     */    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        String name = request.getParameter("user");        String message = model.doHello(name);        System.out.println(message + "$$$$$$$$$$");        request.setAttribute("message", message);        request.getRequestDispatcher("hello.view").forward(request, response);    }}

 

HelloView.java:

package cc.openhome;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class HelloView */@WebServlet("/hello.view")public class HelloView extends HttpServlet {    private static final long serialVersionUID = 1L;    private String htmlTemplate =             ""            + "    "            + "        
     "            + "        "            + "    "            + "    "            + "        
%s
"            + "    "            + "";           /**     * @see HttpServlet#HttpServlet()     */    public HelloView() {        super();        // TODO Auto-generated constructor stub    }    /**     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)     */    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        String user = request.getParameter("user");        String message = (String) request.getAttribute("message");        System.out.println(user + message + "##################");        String html = String.format(htmlTemplate, user, message);        response.getWriter().print(html);    }}