一、ModelAndView

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：{视图解析器前缀} + viewName + {视图解析器后缀}

二、ServletAPI

通过设置ServletAPI ,不需要视图解析器。

1. 通过HttpServletResponse进行输出

package com.massimo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.imageio.IIOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@Controller
public class ModelTest1 {

    @RequestMapping("m1/t1")
    public String test1(HttpServletRequest request, HttpServletResponse response) throws IOException {
        HttpSession session = request.getSession();
        System.out.println(session.getId());
        return "hello";
    }
}

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效果：

2. 通过HttpServletResponse实现重定向

package com.massimo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.imageio.IIOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@Controller
public class ModelTest1 {

    @RequestMapping("/m1/t2")
    public void test2(HttpServletRequest request , HttpServletResponse response) throws Exception{
        response.sendRedirect("/hello");
    }
}

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效果：

3. 通过HttpServletResponse实现转发

package com.massimo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.imageio.IIOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@Controller
public class ModelTest1 {
    @RequestMapping("m1/t3")
    public void test3(HttpServletRequest request , HttpServletResponse response) throws Exception{
        //转发
        request.setAttribute("msg","/m1/t3");
        request.getRequestDispatcher("/WEB-INF/jsp/hello.jsp").forward(request,response);
    }
}

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项目结构：

三、通过SpringMVC来实现转发和重定向——无需视图解析器

沿用上面的项目，并将视图解析器注释掉！

3.1、方式一

@RequestMapping("m1/t1")
    public String test1(Model model) {
        //转发
        model.addAttribute("msg","ModelTest1");
        return "/WEB-INF/jsp/hello.jsp";
    }
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效果：

3.2、方式二

@RequestMapping("m1/t1")
    public String test1(Model model) {
        //转发
        model.addAttribute("msg","ModelTest1+forward");
        return "forward:/WEB-INF/jsp/hello.jsp";
    }
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方式二：

3.3、方式三

@RequestMapping("m1/t1")
    public String test1(Model model) {
        //重定向
        model.addAttribute("msg","ModelTest1+redirect");
        return "redirect:/index.jsp";
    }
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效果：

四、通过S pringMVC来实现转发和重定向——有视图解析器

重定向,不需要视图解析器，本质就是重新请求一个新地方。所以注意路径问题。