java 学习 JSON.parseObject 和 JSON.toJSONString 一篇文章就够了

JSON.parseObject 是将Json字符串转化为相应的对象；

JSON.toJSONString 是将对象转化为Json字符串

两者主要用于前后台的数据传输过程中

使用前需要先导入该包：

com.alibaba

fastjson

1.2.62

文章目录

一、JSON.parseObject二、JSON.toJSONString三、JSON.parseObject 的其他几种使用

一、JSON.parseObject

将JSON字符串转为Bean对象

Java 对象 Student

@Data

@Accessors(chain = true)

public class Student {

private String name;

private int score;

}

将JSON字符串转为该对象

public class Main {

public static void main(String[] args) {

String jsonStudent = "{name:'yolo',score:90}";

Student student = JSON.parseObject(jsonStudent, Student.class);

System.out.println(student);

}

}

二、JSON.toJSONString

是将对象转化为Json字符串

public class Main {

public static void main(String[] args) {

Student student = new Student().setName("yolo").setScore(98);

String s = JSON.toJSONString(student);

System.out.println(s);

}

}

三、JSON.parseObject 的其他几种使用

示例1：str = “{“name”:“Yolo”,“Address”:“Beijing”}”;

public class Main {

public static void main(String[] args) {

String str = "{\"name\":\"Yolo\",\"Address\":\"Beijing\"}";

JSONObject jsonObject = JSON.parseObject(str);

System.out.println(jsonObject.toString());

System.out.println(jsonObject.getString("name"));

System.out.println(str);

}

}

示例2：str2 = “{“name”:“Yolo”,“Address”:“Beijing”, “data”:{“id”: 123}}”

public class Main {

public static void main(String[] args) {

String str2 = "{\"name\":\"Yolo\",\"Address\":\"Beijing\", \"data\":{\"id\": 123}}";

JSONObject jsonObject2 = JSON.parseObject(str2);

System.out.println(jsonObject2.getString("data"));

System.out.println(JSON.parseObject(jsonObject2.getString("data")).getString("id"));

}

}

示例3：str3 = “{“name”:“Yolo”,“Address”:“Beijing”, “data”:[{“id”: 123},{“id”: 345}]}”;

public class Main {

public static void main(String[] args) {

String str3 = "{\"name\":\"Yolo\",\"Address\":\"Beijing\", \"data\":[{\"id\": 123},{\"id\": 345}]}";

JSONObject jsonObject3 = JSON.parseObject(str3);

System.out.println(jsonObject3.toString());

System.out.println(jsonObject3.toJSONString());

System.out.println("data " + jsonObject3.getString("data"));

JSONArray data = JSON.parseArray(jsonObject3.getString("data"));

for (Object d: data) {

System.out.println(d);

System.out.println(JSON.parseObject(d.toString()).getString("id"));

System.out.println(JSON.parseObject(String.valueOf(d)).getString("id"));

}

}

}

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