4. Results Skip mode

The results jump method

ModelAndView

Set ModelAndView object, jump to a specific page based on the name of the view, and the view resolver.

Page: {prefix view resolver} + viewName + {} suffix view resolver

<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
      id="internalResourceViewResolver">
    <!-- 前缀 -->
    <property name="prefix" value="/WEB-INF/jsp/" />
    <!-- 后缀 -->
    <property name="suffix" value=".jsp" />
</bean>

 

Corresponding controller class

public class ControllerTest1 implements Controller {

    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        //返回一个模型视图对象
        ModelAndView mv = new ModelAndView();
        mv.addObject("msg","ControllerTest1");
        mv.setViewName("test");
        return mv;
    }
}

 

ServletAPI

By providing ServletAPI, you need not view resolver.

1. Output via HttpServletResponse
2. Redirection by HttpServletResponse
3. HttpServletResponse achieved by forwarding

@Controller
public class ResultGo {

    @RequestMapping("/result/t1")
    public void test1(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
        rsp.getWriter().println("Hello,Spring BY servlet API");
    }

    @RequestMapping("/result/t2")
    public void test2(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
        rsp.sendRedirect("/index.jsp");
    }

    @RequestMapping("/result/t3")
    public void test3(HttpServletRequest req, HttpServletResponse rsp) throws Exception {
        //转发
        req.setAttribute("msg","/result/t3");
        req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,rsp);
    }

}

 

SpringMVC

Forwarding and redirection is achieved by SpringMVC - no need to view resolver;

Before the test, you need to comment out the view resolver

@Controller
public class ResultSpringMVC {
    @RequestMapping("/rsm/t1")
    public String test1(){
        //转发
        return "/index.jsp";
    }

    @RequestMapping("/rsm/t2")
    public String test2(){
        //转发二
        return "forward:/index.jsp";
    }

    @RequestMapping("/rsm/t3")
    public String test3(){
        //重定向
        return "redirect:/index.jsp";
    }
}

 

Forwarding and redirection is achieved by SpringMVC - have view resolver;

Redirect, no view resolver, essentially re-request a new place Well, so pay attention to the path problem.

A request can be redirected to another implementation.

@Controller
 public  class ResultSpringMVC2 { 
    @RequestMapping ( "/ Rsm2 / T1" )
     public String test1 () {
         // forward 
        return "Test" ; 
    } 

    @RequestMapping ( "/ Rsm2 / T2" )
     public String test2 () {
         // weight oriented 
        return "the redirect: /index.jsp" ;
         // return "the redirect: hello.do"; // hello.do another request / 
    } 

}