springmvc (4) The results are shown to the front

1. Set ModelAndView object. The view and the view name resolver jump to a specific page (prefix + viewName + ViewResolver ViewResolver suffix)

mvc.xml 
    <-! configuration view resolver ->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <! - Results prefix view ->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <! - results view suffix ->
        <property name="suffix" value=".jsp"/>
    </bean>

Processor class:
 public  class HelloControllerControll the implements the Controller {
    @Override
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest,
                                      HttpServletResponse httpServletResponse) throws Exception {
        ModelAndView ModelAndView = new new ModelAndView ();
         // package to be displayed in the data view 
        modelAndView.addObject ( " MSG " , " the Hello SimpleUrlHandlerMapping " );
         // attempt name 
        modelAndView.setViewName ( " Hello " );   //    / WEB- INF / JSP / hello.jsp 
        return ModelAndView;
    }
}

The code of the page jump ([ViewResolver prefix / WEB-INF / jsp / viewName] + [hello] + [ViewRenderer suffix .jsp]), i.e. /WEB-INF/jsp/hello.jsp

2. achieved by Servlet API, need not view resolver

1) output by HttpServletResponse

 @RequestMapping("/hello")
    public void hello(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.getWriter().println("use HttpServlet API");
    }

Here is a thing that, in addition to / hello can be mapped to the processor, / hello. * And / hello / can be mapped, / hello.jsp not, because the extension .jsp tomcat comes with a higher priority than my match configuration [/], it will be a .jsp hello.jsp match, the match will not be my dispatcherServlet.

2) be redirected through HttpServletResponse

  @RequestMapping("/hello")
    public void hello(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.sendRedirect("index.jsp");
    }

3) forwarded by HttpServletRequest

 @RequestMapping("/hello")
    public void hello(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
        request.setAttribute("msg","HttpServletRequest forward");
        request.getRequestDispatcher("index.jsp").forward(request,response);
    }

The forward will not be used view resolvers

3. forwarding and redirection springMVC - no view when the parser

1) forwarding achieve

  @RequestMapping("/hello1")
    public String hello(){
        //转发1
        return "index.jsp";
    }

 @RequestMapping("/hello1")
    public String hello(){
        //转发2
        return "forward:index.jsp";
    }

2) redirected to achieve

  @RequestMapping("/hello1")
    public String hello(){
        return "redirect:index.jsp";
    }

4. forwarding and redirection springMVC - when there ViewResolver

Forwarding of implementation:

   @RequestMapping("/hello2")
    public String hello2(){
        return "hello";
    }

By view resolver will find: /WEB-INF/jsp/hello.jsp

Redirection view resolver not be used, because a path is redefined, corresponding to a restart request corresponding to mvc mapping method into the processor rather than in response to rendering data and the like jsp pages.

springmvc (4) The results are shown to the front

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