springmvc跳转方式

第四讲 跳转结果的方式

1设置 ModelAndView对象，根据View的名称，和视图解析器跳转到指定的页面。

页面：试图解析器的前缀+view name +视图解析器的后缀

@Controller
public class HelloController {
    @RequestMapping("/hello")
    public ModelAndView hello(HttpServletRequest req,HttpServletResponse rep){
        ModelAndView mv = new ModelAndView();
        
        mv.addObject("msg", "hello Springmvc Annotation");
        
        mv.setViewName("hello");
        return mv;
    }

2通过ServletAPI对象来实现,不需要视图解析器

通过HttpServletResponse 来进行输出

@Controller
public class HelloController {
    @RequestMapping("/hello")
    public void  hello(HttpServletRequest req,HttpServletResponse rep) throws IOException{
        rep.getWriter().println("spring mvc user httpservletapi");
        
    }

通过HttpServletResponse 实现重定向

@Controller
public class HelloController {
    @RequestMapping("/hello")
    public void  hello(HttpServletRequest req,HttpServletResponse rep) throws IOException{
        //rep.getWriter().println("spring mvc user httpservletapi");
        //实现重定向
        rep.sendRedirect("index.jsp");
        
    }

}

通过HttpServletRequest 实现转发

@Controller
public class HelloController {
    @RequestMapping("/hello")
    public void  hello(HttpServletRequest req,HttpServletResponse rep) throws IOException, ServletException{
        //rep.getWriter().println("spring mvc user httpservletapi");
        //实现重定向
        //rep.sendRedirect("index.jsp");
        //实现转发
        req.setAttribute("msg", "servlet api forward");
        req.getRequestDispatcher("index.jsp").forward(req, rep);
    }

}

3 通过springmvc来实现转发和重定向 没有视图解析器

转发的实现1

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

转发的实现2

@RequestMapping("/hello1")
    public String hello(){
        //转发1
        //return "index.jsp";
        //转发2
        return "forward:index.jsp";
    }

重定向

    @RequestMapping("/hello1")
    public String hello(){
        //转发1
        //return "index.jsp";
        //转发2
        //return "forward:index.jsp";
        return "redirect:index.jsp";
    }

4 通过springmvc来实现转发和重定向--有视图解析器

转发

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

注意：重定向return "redirect:index.jsp"不需要视图解析器

    @RequestMapping("/hello2")
    public String hello2(){
        //转发
        //return "hello";
        //重定向
        return "redirect:hello.do";
    }