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

1、Java物件-->JSON物件

(JSONObject)JSONObject.toJSON(Java物件例項)

 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物件轉化為JSON物件
 6         JSONObject jsonObject = (JSONObject) JSONObject.toJSON(stu);
 7         System.out.println("Java物件轉化為JSON物件\n" + jsonObject);//{"name":"公眾號程式設計大道","age":2,"sex":"m"}
 8         
 9     }
10 }

2、Java物件-->JSON字串

JSONObject.toJSONString(Java物件例項)

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物件轉換成JSON字串
6         String stuString = JSONObject.toJSONString(stu);
7         System.out.println("Java物件轉換成JSON字串\n" + stuString);//{"age":2,"name":"公眾號程式設計大道","sex":"m"}
8     }
9 }

 3、JSON物件-->JSON字串

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物件
 6         JSONObject jsonObject = (JSONObject) JSONObject.toJSON(stu);
 7 
 8         //JSON物件轉換為JSON字串
 9         String jsonString = jsonObject.toJSONString();
10         System.out.println("JSON物件轉換為JSON字串\n" + jsonString);//{"name":"公眾號程式設計大道","age":2,"sex":"m"}
11 
12     }
13 }

 4、JSON物件-->Java物件

 JSONObject.toJavaObject(JSON物件例項, Java物件.class);

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

        //先轉成JSON物件
        JSONObject jsonObject = (JSONObject) JSONObject.toJSON(stu);
        
        //JSON物件轉換成Java物件
        Student student = JSONObject.toJavaObject(jsonObject, Student.class);
        System.out.println("JSON物件轉換成Java物件\n" + student);//Student{name='公眾號程式設計大道', sex='m', age=2}
    }
}

 5、JSON字串-->JSON物件

JSONObject.parseObject(JSON字串)

 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字串轉換成JSON物件
 6         JSONObject jsonObject1 = JSONObject.parseObject(stuString);
 7         System.out.println("JSON字串轉換成JSON物件\n" + jsonObject1);//{"sex":"m","name":"公眾號程式設計大道","age":2}
 8     }
 9 }

 6、JSON字串-->Java物件

JSONObject.parseObject(JSON字串, Java物件.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字串轉換成Java物件
6         Student student1 = JSONObject.parseObject(stuString, Student.class);
7         System.out.println("JSON字串轉換成Java物件\n" + student1);//Student{name='公眾號程式設計大道', sex='m', age=2}
8     }
9 }

7、JSON字串-->List<Java物件>

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

 文章出處，感謝大佬帥氣的總結~