我正在用java编写一个独立的脚本，需要在其中创建.json文件并将数据写入其中。如果没有任何json库，我如何添加它。我的json应该是

{
   "pageInfo": {
         "pageName": "ttt",
         "pageNumbers": "12"
    },
    "posts": [
         {
              "post_id": "12345678",
              "actor_id": "123456745345890",
              "nameOfPersonWhoPosted": "Mark",
              "message": "Sounds cool. Can't wait to see it!",
              "likesCount": "2",
              "comments": [],
              "timeOfPost": "7878"
         }
    ]
}