一起写框架-MVC框架-基础功能-实现forward和redirect的跳转(四)

 1 package ioc.webmvc.views;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.ServletException;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 /**
10  * 声明一个视图解释器接口，用于方便以后扩展支持多种视图，如：Freemarker,Velocity等 默认支持JSP
11  * 
12  * @author ranger
13  *
14  */
15 public interface ViewRelover {
16     /**
17      * 定义一个跳转到视图的方法
18      * 
19      * @param result
20      * @param request
21      * @param response
22      * @throws IOException
23      * @throws ServletException
24      */
25     void toView(String result, HttpServletRequest request, HttpServletResponse response)
26             throws IOException, ServletException;
27 }

 1 package ioc.webmvc.views;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.ServletException;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 public class JspViewRelover implements ViewRelover {
10     
11     @Override
12     public  void toView(String result,HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException{
13         if (result != null) {
14             StringBuilder sb = new StringBuilder(result);
15             String substring = sb.substring(0, sb.indexOf(":") + 1);
16             System.out.println("-返回类型:-" + substring);
17             if (substring != null) {
18                 String dispacherStr = sb.substring(sb.indexOf(":") + 1, sb.length());
19                 if (substring.equals("redirect:")) {
20                     response.sendRedirect(request.getContextPath()+"/"+dispacherStr);
21                 } else if (substring.equals("forward:")) {
22                     request.getRequestDispatcher(dispacherStr).forward(request, response);
23                 } else {
24                     throw new RuntimeException("返回的映射路径格式错误！");
25                 }
26 
27             } else {
28                 request.getRequestDispatcher(result).forward(request, response);
29             }
30 
31         }
32     }
33 
34 }

 1     @Override
 2     protected void service(HttpServletRequest request, HttpServletResponse response)
 3             throws ServletException, IOException {
 4         System.out.println("-测试成功--");
 5 
 6         ControllerRelolver rs = new ControllerRelolver();
 7         try {
 8              //1.根据路径执行Controller对应的映射方法
 9             String result = rs.execute(request, response, contextApplication.getContext());
10              //2.执行视图解释器，返回视图
11             JspViewRelover viewRelover=new JspViewRelover();
12             viewRelover.toView(result, request, response);
13         
14         } catch (IllegalAccessException e) {
15             // TODO Auto-generated catch block
16             e.printStackTrace();
17         } catch (IllegalArgumentException e) {
18             // TODO Auto-generated catch block
19             e.printStackTrace();
20         } catch (InvocationTargetException e) {
21             // TODO Auto-generated catch block
22             e.printStackTrace();
23         }
24 
25     }

 1 package org.webmvc.controller;
 2 
 3 import javax.servlet.http.HttpServletRequest;
 4 import javax.servlet.http.HttpServletResponse;
 5 
 6 import ioc.core.annotation.stereotype.Controller;
 7 import ioc.webmvc.annotation.RequestMapping;
 8 
 9 @Controller
10 public class UserController {
11     
12     /**
13      * 路径规则：
14      * 1.必须包括有/开头
15      * 2.后缀必须忽略不写
16      * 如：http://localhost:8080/webmvc-demo-test-01/test.do
17      * 对应的映射路径为：/test
18      *  
19      */
20     @RequestMapping(value = "/login")
21     public String login(HttpServletRequest request,HttpServletResponse response){
22         System.out.println("-登录Controller-");
23         return "redirect:/login.jsp";
24 
25     }
26 
27 }
28