博客

package com.shsxt.springmvc.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import java.util.Map;

/**
 * 设置request请求域
 * 1.ModelAndView对象
 * modelAndView.addObject("变量名","值")
 * 2.HttpServletRequest 对象(形参上定义)
 *   setAttribute("键","值")
 *   3.Model对象(形参上定义)
 *     addAttribute("键","值")
 *     4.ModelMap对象(形参上定义)
 *       addAttribute("键","值")
 *       5.Map对象
 *       put("键","值")
 *
 *    设置session作用域
 *    HttpServletRequest 对象(形参上定义)//对象就是session
 *     session.setAttribute("键","值")
 *
 *
 * addObject("变量名","值")
 * 2.HttpServletRequest对象
 */
@Controller
public class ModelController {
    @RequestMapping("m01")
    public ModelAndView model01() {

        ModelAndView modelAndView = new ModelAndView();
        //设置请求域
        modelAndView.addObject("msg", "请求域");
        //设置视图
        modelAndView.setViewName("model");
        return modelAndView;
    }

    /**
     * HttpServletRequest对象
     * setAttribute
     * @param request
     * @return
     */
    @RequestMapping("m02")
    public String model02(HttpServletRequest request) {
        request.setAttribute("msg", "request作用域");

        return "model";
    }


    /**
     * Model对象
     * addAttribute
     * @param model
     * @return
     */
    @RequestMapping("m03")
    public String model03(Model model) {
       model.addAttribute("msg","model请求域");

        return "model";
    }

    /**
     * ModelMap对象
     * addAttribute
     * @param model
     * @return
     */
    @RequestMapping("m04")
    public String model04(ModelMap model) {
        model.addAttribute("msg","modelMap请求域");

        return "model";
    }

    /**
     * Map 对象
     * @param map
     * @return
     */

    @RequestMapping("m05")
    public String model05(Map map) {
        map.put("msg","map请求域");

        return "model";
    }


}