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

冷不防 2023-01-06 12:00 269阅读 0赞

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

### 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("公众号编程大道", "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":"公众号编程大道","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("公众号编程大道", "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":"公众号编程大道","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("公众号编程大道", "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":"公众号编程大道","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("公众号编程大道", "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)

public class JSON2JavaTest{
        
        public static void main(String[] args) {
        
            String stuString = "{\"age\":2,\"name\":\"公众号编程大道\",\"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":"公众号编程大道","age":2}
        }
    }

### 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\":\"公众号编程大道\",\"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='公众号编程大道', sex='m', age=2}
        }
    }