java对象或list集合 ＞ json

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.3</version>
</dependency>

<dependency>
    <groupId>com.colobu</groupId>
    <artifactId>fastjson-jaxrs-json-provider</artifactId>
    <version>0.3.1</version>
</dependency>

public class TestFastJSON {
    
    

    //Java对象转JSON
    @Test
    public void javaBeanToJSON(){
    
    

        //创建Person对象
        Person p = new Person("码云",15, DateUtils.getDateFormart());

        //使用JSON对象的 toString方法将对象转换为JOSN数据
        String s = JSON.toJSONString(p);

        System.out.println(s); //{"age":15,"birthday":"2020-07-03 19:54:33","username":"码云"}
    }


    //List集合转Json
    @Test
    public void ListToJSON(){
    
    

        //创建Person对象
        Person p1 = new Person("码云",15, DateUtils.getDateFormart());
        Person p2 = new Person("虎子",13, DateUtils.getDateFormart());
        Person p3 = new Person("小斌",18, DateUtils.getDateFormart());

        List<Person> list = new ArrayList<>();

        Collections.addAll(list,p1,p2,p3);

        //使用JSON对象的 toString方法将对象转换为JOSN数据
        String s = JSON.toJSONString(list);

        System.out.println(s);
        /*
	        [
		        {"age":15,"birthday":"2020-07-03 19:59:05","username":"码云"},
		        {"age":13,"birthday":"2020-07-03 19:59:05","username":"虎子"},
		        {"age":18,"birthday":"2020-07-03 19:59:05","username":"小斌"}
	        ]
        */
    }
}