解析带泛型的json数据

ublic class Test {
    public static void main(String[] args) {
        Map<String, User> map = new HashMap<>();
        User user = new User();
        (11);
        (11);
        ("1",user);
        String jsonString = (map);
        String str = new String(());

        /**
         * fastjson
         */
        Map<String,User> map1 = (jsonString, );
        ("FastJson直接解析:"+ ("1") );
        Map<String,User> map2 = (str, new TypeReference<Map<String,User>>(){}.getType());
        ("FastJson包装解析:" + ("1"));

        /**
         * gson
         */
        Gson gson = new Gson();
        Map<String,User> map3 = (str, );
        ("gson直接解析:"+ ("1"));
        Map<String,User> map4 = (str, new TypeToken<Map<String,User>>(){}.getType());
        ("gson包装解析:"+ ("1"));

        //直接解析的没法转换成对象
        User user3 = ("1");
        (user3);

        User user1 = ("1");
        (user1);
        User user2 = ("1");
        (user2);


    }
}

执行结果

FastJson直接解析:{"id":11,"age":11}
FastJson包装解析:User{id=11, name='null', age=11}
gson直接解析:{age=11.0, id=11.0}
gson包装解析:User{id=11, name='null', age=11}
Exception in thread "main" :  cannot be cast to 
User{id=11, name='null', age=11}
	at (:45)

直接解析的并没有转换成对象, 所以后面从map里拿取对象的时候 会报转换异常