json转Map，json转List＜实体类＞

实例代码：

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.Data;

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

@Data
public class User {
    
    private Integer id;
    
    private String username;
    
    private String password;

    public static void main(String[] args) {
        String result = "{"id":1,"username":"张三","password":"zhangsan"}";
        String result1 = "[{"id":1,"username":"张三","password":"zhangsan"},{"id":1,"username":"李四","password":"lisi"}]";
        
        Map resultMap = JSON.parseObject(result);
        System.out.println(resultMap.get("username"));

        List list = JSONObject.parseArray(result1, User.class);
        System.out.println(list.get(0).getUsername());
        System.out.println(list.get(1).getUsername());
    }
}

运行结果：