JSON工具类

fastjson

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.76</version>
</dependency>

JSON字符串转对象

java实现

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.annotation.JSONField;
import lombok.Data;

import java.util.Date;

@Data
public class User {
    private String id;
    
    @JSONField(name = "user_name") // 指定JSON中的字段名与Java对象字段名不一致时的映射
    private String userName;
    
    @JSONField(format = "yyyy-MM-dd") // 指定日期格式化
    private Date birthDate;


    public static void main(String[] args) {
        String jsonString = "{\"id\":\"123\", \"user_name\":\"张三\", \"birth_date\":\"1990-01-01\"}";
        
        // 将JSON字符串转换为User对象
        User user = JSON.parseObject(jsonString, User.class);
        
        System.out.println(user.getId()); // 输出: 123
        System.out.println(user.getUserName()); // 输出: 张三
        System.out.println(user.getBirthDate()); // 输出: Mon Jan 01 00:00:00 CST 1990
    }
}

取属性

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.JSONPath;

@Test
public void test() throws Exception {
    String json = "{\"name\":\"xx\"}";
    String json2 = "[{\"name\":\"xx\"},{\"name\":\"xx2\"}]";
    String json3 = "{\"code\":200,\"data\":[{\"id\":1,\"name\":\"admin\",\"age\":28},{\"id\":2,\"name\":\"test\",\"age\":30}]}";
    Object read = JSONPath.read(json, "$.name");
    Object read2 = JSONPath.read(json2, "$.name");
    Object read3 = JSONPath.read(json3, "$.data[*].name");
    System.out.println(read);
    System.out.println(read2);
    System.out.println(read3);
}

xx
["xx","xx2"]
["admin","test"]