fastjson--对象与JSON之间的转换方法

我会带着你远行 2024-03-24 10:51 18阅读 0赞

#### 1、Java对象–>JSON对象： ####

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

public class JSON2JavaTest{
        
      public static void main(String[] args) {
        
         Student stu = new Student("公众号", "m", 2);
    
         //Java对象转化为JSON对象
         JSONObject jsonObject = (JSONObject) JSONObject.toJSON(stu);
         System.out.println("Java对象转化为JSON对象\n" + jsonObject);//{"name":"编程","age":2,"sex":"m"}
      }
    }

#### 2、Java对象–>JSON字符串 ####

JSONObject.toJSONString(Java对象实例)

public class JSON2JavaTest{
        
        public static void main(String[] args) {
        
            Student stu = new Student("公众y", "m", 2);
    
            //Java对象转换成JSON字符串
            String stuString = JSONObject.toJSONString(stu);
            System.out.println("Java对象转换成JSON字符串\n" + stuString);//{"age":2,"name":"大道","sex":"m"}
        }
    }

#### 3、JSON对象–>JSON字符串 ####

JSONObject.toJSONString();

public class JSON2JavaTest{
        
     public static void main(String[] args) {
        
         Student stu = new Student("公众oy", "m", 2);
    
         //先转成JSON对象
         JSONObject jsonObject = (JSONObject) JSONObject.toJSON(stu);
    
         //JSON对象转换为JSON字符串
         String jsonString = jsonObject.toJSONString();
         System.out.println("JSON对象转换为JSON字符串\n" + jsonString);//{"name":"公大道","age":2,"sex":"m"
     }
    }

#### 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erBoy", "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='公众道', sex='m', age=2}
        }
    }

#### 5、JSON字符串–>JSON对象 ####

JSONObject.parseObject(JSON字符串)

public class JSON2JavaTest{
        
     public static void main(String[] args) {
        
         String stuString = "{\"age\":2,\"name\":\"公众 Big\",\"sex\":\"m\"}";
    
         //JSON字符串转换成JSON对象
         JSONObject jsonObject1 = JSONObject.parseObject(stuString);
         System.out.println("JSON字符串转换成JSON对象\n" + jsonObject1);//{"sex":"m","name":"公众道","age":
     }
    }

#### 6、JSON字符串–>Java对象 ####

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

public class JSON2JavaTest{
        
        public static void main(String[] args) {
        
            String stuString = "{\"age\":2,\"name\":\"公号 By\",\"sex\":\"m\"}";
    
            //JSON字符串转换成Java对象
            Student student1 = JSONObject.parseObject(stuString, Student.class);
            System.out.println("JSON字符串转换成Java对象\n" + student1);//Student{name='公程大道', sex='m', age=2
        }
    }

#### 7、JSON字符串–>List<Java对象> ####

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

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