com.alibaba.fastjson.JSONObject之對象與JSON轉換方法

 com.alibaba.fastjson.JSONObject時經常會用到它的轉換方法，包括Java對象轉成JSON串、JSON對象，JSON串轉成java對象、JSON對象，JSON對象轉換Java對象、JSON串等，使用方法總結如下，持續更新...

1、Java對象-->JSON對象

(JSONObject)JSONObject.toJSON(Java對象實例)

 1 public class JSON2JavaTest{
 2     public static void main(String[] args) {
 3         Student stu = new Student("公眾號BiggerBoy", "m", 2);
 4 
 5         //Java對象轉化為JSON對象
 6         JSONObject jsonObject = (JSONObject) JSONObject.toJSON(stu);
 7         System.out.println("Java對象轉化為JSON對象\n" + jsonObject);//{"name":"公眾號編程大道","age":2,"sex":"m"}
 8         
 9     }
10 }

 

2、Java對象-->JSON字符串

JSONObject.toJSONString(Java對象實例)

1 public class JSON2JavaTest{
2     public static void main(String[] args) {
3         Student stu = new Student("公眾號BiggerBoy", "m", 2);
4 
5         //Java對象轉換成JSON字符串
6         String stuString = JSONObject.toJSONString(stu);
7         System.out.println("Java對象轉換成JSON字符串\n" + stuString);//{"age":2,"name":"公眾號編程大道","sex":"m"}
8     }
9 }

 

 3、JSON對象-->JSON字符串

JSONObject.toJSONString();

 1 public class JSON2JavaTest{
 2     public static void main(String[] args) {
 3         Student stu = new Student("公眾號BiggerBoy", "m", 2);
 4 
 5         //先轉成JSON對象
 6         JSONObject jsonObject = (JSONObject) JSONObject.toJSON(stu);
 7 
 8         //JSON對象轉換為JSON字符串
 9         String jsonString = jsonObject.toJSONString();
10         System.out.println("JSON對象轉換為JSON字符串\n" + jsonString);//{"name":"公眾號編程大道","age":2,"sex":"m"}
11 
12     }
13 }

 

 4、JSON對象-->Java對象

 JSONObject.toJavaObject(JSON對象實例, Java對象.class);

public class JSON2JavaTest{
    public static void main(String[] args) {
        Student stu = new Student("公眾號BiggerBoy", "m", 2);

        //先轉成JSON對象
        JSONObject jsonObject = (JSONObject) JSONObject.toJSON(stu);
        
        //JSON對象轉換成Java對象
        Student student = JSONObject.toJavaObject(jsonObject, Student.class);
        System.out.println("JSON對象轉換成Java對象\n" + student);//Student{name='公眾號編程大道', sex='m', age=2}
    }
}

 

 5、JSON字符串-->JSON對象

JSONObject.parseObject(JSON字符串)

 1 public class JSON2JavaTest{
 2     public static void main(String[] args) {
 3         String stuString = "{\"age\":2,\"name\":\"公眾號 BiggerBoy\",\"sex\":\"m\"}";
 4 
 5         //JSON字符串轉換成JSON對象
 6         JSONObject jsonObject1 = JSONObject.parseObject(stuString);
 7         System.out.println("JSON字符串轉換成JSON對象\n" + jsonObject1);//{"sex":"m","name":"公眾號編程大道","age":2}
 8     }
 9 }

 

 6、JSON字符串-->Java對象

JSONObject.parseObject(JSON字符串, Java對象.class);

1 public class JSON2JavaTest{
2     public static void main(String[] args) {
3         String stuString = "{\"age\":2,\"name\":\"公眾號 BiggerBoy\",\"sex\":\"m\"}";
4 
5         //JSON字符串轉換成Java對象
6         Student student1 = JSONObject.parseObject(stuString, Student.class);
7         System.out.println("JSON字符串轉換成Java對象\n" + student1);//Student{name='公眾號編程大道', sex='m', age=2}
8     }
9 }

 

7、JSON字符串-->List<Java對象>

 List<T> parseArray(JSON字符串, Java對象.class) 

public class JSON2JavaTest{
    public static void main(String[] args) {
        String stuString = "[{\"age\":2,\"name\":\"公眾號\",\"sex\":\"m\"},{\"age\":18,\"name\":\"BiggerBoy\",\"sex\":\"m\"}]";

        //JSON字符串轉換成Java對象
        List<Student> studentList = JSONObject.parseArray(stuString, Student.class);
        System.out.println("JSON字符串轉換成Java對象list\n" +studentList );
　　 }
 }

 

 文章出處，感謝大佬帥氣的總結~