SpringStudy/springmvcdemo/src/main/java/cc/bnblogs/controller/DataHandler.java

package cc.bnblogs.controller;

import cc.bnblogs.entity.User;
import cc.bnblogs.entity.UserList;
import cc.bnblogs.entity.UserMap;
import org.springframework.web.bind.annotation.*;

import java.util.Arrays;

/**
 * @description: SpringMVC数据绑定
 * @author: zfp@bnblogs.cc
 * @date: 2023/3/25 15:05
 */
@RestController
@RequestMapping("data")
public class DataHandler {
    /**
     * 请求url: http://localhost:8080/data/id?id=10
     * @param id
     * @return
     */
    @RequestMapping("id")
    public String getId(Integer id) {
        System.out.println(id);
        return id+"";
    }

    /**
     * 请求url: http://localhost:8080/data/name?names=aaa&names=bbb&names=cccc
     * @param names
     * @return
     */
    @RequestMapping("name")
    public String getNames(String[] names) {
        return Arrays.toString(names);
    }

    /**
     * 返回用户列表，SpringMVC不能直接接收一个List集合，只能将List集合封装为一个类
     * @param userList 用户数据保存在列表中
     * @return
     */
    @RequestMapping(value = "list",method = RequestMethod.POST)
    public String list(UserList userList) {
        System.out.println(userList); // 输出list中的数据
        StringBuilder str = new StringBuilder();
        for (User user : userList.getUsers()) {
            str.append(user);
        }
        return str.toString();
    }

    /**
     * 返回用户数据，SpringMVC不能直接接收一个Map，只能将Map封装为一个类
     * @param userMap 用户数据保存在Map的value中
     * @return
     */
    @RequestMapping(value = "map",method = RequestMethod.POST)
    public String map(UserMap userMap) {
//        System.out.println(userMap); // 输出map中的数据
        StringBuilder str = new StringBuilder();
        for (String key : userMap.getUsers().keySet()) {
            User user = userMap.getUsers().get(key);
            str.append(user);
        }
        return str.toString();
    }

    /**
     * 接收一个json数据,返回User对象
     */
    @RequestMapping(value = "json",method = RequestMethod.POST)
    public User getJson(@RequestBody User user) {
        System.out.println("user = " + user);
        return user;
    }


}