对象/集合转换成json

public class User {
    private int id;
    private String name;
    public User(){
        
    }
    public User(int id, String name) {
        super();
        this.id = id;
        this.name = name;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    
}

public class Demo {
    public static void main(String[] args) {
        //将集合转成json
        List<User> user_list = new ArrayList<>();
        user_list.add(new User(1, "盖伦"));
        user_list.add(new User(2, "鲁迅"));
        String list_json = Json.toJson(user_list, JsonFormat.compact());
        System.out.println(list_json);
        
        //将对象转成json
        User user = new User();
        user.setId(1);
        user.setName("张三");
        String obj_json = Json.toJson(user, JsonFormat.compact());
        System.out.println(obj_json);
    }

}