Controller返回ModelAndView、String

package com.buba.controller;

import com.buba.pojo.User;
import com.buba.service.UserService;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
import java.util.Map;

@RestController
public class UserController {

    @Resource
    private UserService userService;

	//返回index,这个字符串
    @RequestMapping("/1")
	@ResponseBody
    public String index() {
        return "index";
    }

	//返回index2.jsp这个页面里面的内容
    @RequestMapping("/2")
    public String index2(){
        return "index2";
    }

    /**
     * 返回的是视图加模型
     * 视图是view     指的是视图的名字，经过试图解析器指向到相对应的视图上
     * 模型是model    指的是一个类型，比如list,对象，map，在前台页面上可以取出相对应的东西
     * @param model
     * @return
     */
    @RequestMapping("/3")
    public ModelAndView index3(Model model){
        model.addAttribute("list",userService.select());
        return new ModelAndView("index","usermodel",model);
    }

    @RequestMapping("/4")
    public ModelAndView index4(Map<String,Object> map){
        map.put("list",userService.select());
        return new ModelAndView("index","usermodel",map);
    }

    //ajax做请求的时候
    @RequestMapping("/5")
    @ResponseBody
    public Object index5(){
        return userService.select();
    }

    @RequestMapping("/6")
    public void index6(String vname, String vpassword, HttpServletRequest request, HttpServletResponse response) throws Exception{
        request.setAttribute("vname", vname);
        request.setAttribute("vpassword", vpassword);
        System.out.println(vname+" "+vpassword);
        request.getRequestDispatcher("/index.jsp").forward(request, response);
    }

}