FastJson将Java对象转换成json

确保环境依赖都配置好！

1.在pom.xml导入依赖

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.60</version>
        </dependency>

2.创建实体类

package com.king.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private String name;
    private int id;
    private String sex;
}

3.创建controller

package com.king.controller;

import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.king.pojo.User;
import com.king.utils.JsonUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

//@Controller   //会走视图解析器
@RestController     //这个注解 在这个类下的所有方法 就不会走视图解析器。会直接返回一个字符串
public class UserController {

    @RequestMapping("/j4")
    public String json4(){
        List<User> userList = new ArrayList<User>();
        User user1 = new User("king1", 13, "男");
        User user2 = new User("king2", 11, "女");
        User user3 = new User("king3", 33, "男");
        User user4 = new User("king4", 23, "女");
        userList.add(user1);
        userList.add(user2);
        userList.add(user3);
        userList.add(user4);

        String s = JSON.toJSONString(userList);
        return s;
    }

}

4.测试