SpringMVC接收前端传递的数据 & SpringMVC返回数据给前端

package com.sun.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.Mapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.List;
import java.util.Map;

/**
 * @author sunhongguang
 * @create 2020-11-26-22:33
 */
@Controller
@RequestMapping(path = "/5")
public class ControllerTest5 {

    /**
     * 前端传递的参数名称和方法的参数名称一致
     *
     * @param name
     * @param model
     * @return
     */
    @GetMapping(path = "/t1")
    public String test1(String name, Model model) {
        model.addAttribute("msg", name);
        return "test";
    }

    /**
     * 前端传递的参数名称和方法的名称不一致，使用@RequestParm参数进行转换
     *
     * @param name
     * @param model
     * @return
     */
    @GetMapping(path = "/t2")
    public String test2(@RequestParam(value = "username") String name, Model model) {
        model.addAttribute("msg", name);
        return "test";
    }


    /**
     * 这样是不行的
     * @param nameList
     * @param model
     * @return
     */
    @GetMapping(path = "/t3")
    public String test3(List<String> nameList,Model model){
        model.addAttribute("msg", nameList.toString());
        System.out.println(nameList.toString());
        System.out.println(nameList);
        return "test";
    }

    @GetMapping(path = "/t4")
    public String test4(@RequestParam(value = "nameList") List<String> names,Model model){
        model.addAttribute("msg", names.toString());
        System.out.println(names.toString());
        System.out.println(names);
        return "test";
    }

    @GetMapping(path = "/t5")
    public String test5(@RequestParam(value = "nameList",defaultValue = "zhangSan,LiSi") List<String> names,Model model){
        model.addAttribute("msg", names.toString());
        System.out.println(names.toString());
        System.out.println(names);
        return "test";
    }

    @GetMapping(path = "/t6")
    public String test6(@RequestParam Map<String,Object> map,Model model){
        model.addAttribute("msg", map);
        System.out.println(map.toString());
        return "test";
    }

//    @PostMapping(path = "/t7")
//    public String test7(@RequestBody Map<String,Object> map){
//        model.addAttribute("msg", map);
//        System.out.println(map.toString());
//        return "test";
//    }
}