1、ModelAndView

设置ModelAndView对象 , 根据view的名称 , 和视图解析器跳到指定的页面 .

页面 : {视图解析器前缀} + viewName +{视图解析器后缀}

 <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

Controller类：

package com.hecn.controller;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author hecn
 * @site hecn.gitee.io
 * @discription
 */
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", "Test1Controller");
        mv.setViewName("test");
        return mv;
    }
}

---

2、ServletAPI

通过设置ServletAPI , 不需要视图解析器 .

1. 通过HttpServletResponse进行输出
2. 通过HttpServletResponse实现重定向
3. 通过HttpServletResponse实现转发

@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);
    }

}

3、SpringMVC

通过SpringMVC来实现转发和重定向 - 无需视图解析器；

package com.hecn.controller;

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

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author hecn
 * @site hecn.gitee.io
 * @discription
 */
@Controller
public class ResultGoTwo {
    @RequestMapping("/rsm/t1")
    public String test1() {
        //转发
        return "/WEB-INF/jsp/admin.jsp";
    }

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

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

}

通过SpringMVC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嘛 , 所以注意路径问题.

可以重定向到另外一个请求实现 .

package com.hecn.controller;

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

/**
 * @author 陈朋康
 * @site hecn.gitee.io
 * @discription 通过SpringMVC来实现转发和重定向 - 有视图解析器；
 */
@Controller
public class ResultGoThree {
    @RequestMapping("/rsm2/t1")
    public String test1() {
        //转发
        return "admin";
    }

    @RequestMapping("/rsm2/t2")
    public String test2() {
        //转发二
        return "redirect:/index.jsp";
//        return "redirect:hello.do";
    }

}