com.alibaba.fastjson.JSONObject之对象与JSON转换方法

 com.alibaba.fastjson.JSONObject时经常会用到它的转换方法，包括Java对象转成JSON串、JSON对象，JSON串转成java对象、JSON对象，JSON对象转换Java对象、JSON串等，使用方法总结如下，持续更新...

1、Java对象-->JSON对象

(JSONObject)JSONObject.toJSON(Java对象实例)

 1 public class JSON2JavaTest{
 2     public static void main(String[] args) {
 3         Student stu = new Student("公众号BiggerBoy", "m", 2);
 4 
 5         //Java对象转化为JSON对象
 6         JSONObject jsonObject = (JSONObject) JSONObject.toJSON(stu);
 7         System.out.println("Java对象转化为JSON对象\n" + jsonObject);//{"name":"公众号编程大道","age":2,"sex":"m"}
 8         
 9     }
10 }

 

2、Java对象-->JSON字符串

JSONObject.toJSONString(Java对象实例)

1 public class JSON2JavaTest{
2     public static void main(String[] args) {
3         Student stu = new Student("公众号BiggerBoy", "m", 2);
4 
5         //Java对象转换成JSON字符串
6         String stuString = JSONObject.toJSONString(stu);
7         System.out.println("Java对象转换成JSON字符串\n" + stuString);//{"age":2,"name":"公众号编程大道","sex":"m"}
8     }
9 }

 

 3、JSON对象-->JSON字符串

JSONObject.toJSONString();

 1 public class JSON2JavaTest{
 2     public static void main(String[] args) {
 3         Student stu = new Student("公众号BiggerBoy", "m", 2);
 4 
 5         //先转成JSON对象
 6         JSONObject jsonObject = (JSONObject) JSONObject.toJSON(stu);
 7 
 8         //JSON对象转换为JSON字符串
 9         String jsonString = jsonObject.toJSONString();
10         System.out.println("JSON对象转换为JSON字符串\n" + jsonString);//{"name":"公众号编程大道","age":2,"sex":"m"}
11 
12     }
13 }

 

 4、JSON对象-->Java对象

 JSONObject.toJavaObject(JSON对象实例, Java对象.class);

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

        //先转成JSON对象
        JSONObject jsonObject = (JSONObject) JSONObject.toJSON(stu);
        
        //JSON对象转换成Java对象
        Student student = JSONObject.toJavaObject(jsonObject, Student.class);
        System.out.println("JSON对象转换成Java对象\n" + student);//Student{name='公众号编程大道', sex='m', age=2}
    }
}

 

 5、JSON字符串-->JSON对象

JSONObject.parseObject(JSON字符串)

 1 public class JSON2JavaTest{
 2     public static void main(String[] args) {
 3         String stuString = "{\"age\":2,\"name\":\"公众号 BiggerBoy\",\"sex\":\"m\"}";
 4 
 5         //JSON字符串转换成JSON对象
 6         JSONObject jsonObject1 = JSONObject.parseObject(stuString);
 7         System.out.println("JSON字符串转换成JSON对象\n" + jsonObject1);//{"sex":"m","name":"公众号编程大道","age":2}
 8     }
 9 }

 

 6、JSON字符串-->Java对象

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

1 public class JSON2JavaTest{
2     public static void main(String[] args) {
3         String stuString = "{\"age\":2,\"name\":\"公众号 BiggerBoy\",\"sex\":\"m\"}";
4 
5         //JSON字符串转换成Java对象
6         Student student1 = JSONObject.parseObject(stuString, Student.class);
7         System.out.println("JSON字符串转换成Java对象\n" + student1);//Student{name='公众号编程大道', sex='m', age=2}
8     }
9 }

 

7、JSON字符串-->List<Java对象>

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

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

        //JSON字符串转换成Java对象
        List<Student> studentList = JSONObject.parseArray(stuString, Student.class);
        System.out.println("JSON字符串转换成Java对象list\n" +studentList );
　　 }
 }

 文章出处，感谢大佬帅气的总结~