java - 写入 JSONArray

Question

我正在读取 JSON 文件，取出值并进行一些更改。

基本上我向数组添加了一些值。之后我想将其写回到文件中。当我将 JSONArray 写回文件时，会被写入字符串而不是 JSONArray 对象。怎样才能写得好呢？

在以下代码中，我将写入 JSON 文件:

JSONArray rooms = (JSONArray) jsonObject.get("rooms");
for (int i = 0; i < rooms.size(); i++) {
    JSONObject room = (JSONObject) rooms.get(i);
    String roomName = (String) room.get("roomName");
    System.out.println("RoomName: " + roomName + " Size: " + "O: " + oldRoomListSize.get(roomName) + " N: " + roomList.get(roomName).getRoomBook().size());
    if(oldRoomListSize.get(roomName) < roomList.get(roomName).getRoomBook().size()) {
        int n = roomList.get(roomName).getRoomBook().size() - oldRoomListSize.get(roomName);
        for (int j = n; j > 0; j--) {
            int lenght = roomList.get(roomName).getRoomBook().size();

            JSONArray schedule = (JSONArray) room.get("schedule");
            Reservation r = roomList.get(roomName).getRoomBook().get(lenght-j);
            schedule.add(r);
        }
    }
}

fileWriter.write(jsonObject.toJSONString());
fileWriter.close();

如您所见，它被写为字符串，当我想读回它时，它给我带来了问题。

"schedule":["{Day: 1 - Start Time: 10}"]

文件阅读器:

JSONArray schedule = (JSONArray) room.get("schedule");
for (int j = 0; j < schedule.size(); j++) {
    JSONObject s = (JSONObject) schedule.get(j);
    String day = (String) s.get("day");
    String startTime = (String) s.get("startTime");
    lRoom.setRoomBook(Integer.parseInt(day), Integer.parseInt(startTime));
}

Error: java.lang.ClassCastException: java.lang.String cannot be cast to org.json.simple.JSONObject

在数组中输入新值(引入日期和开始时间)后发生错误。它被写成字符串，当我尝试再次读取它时，给我一个错误，说我无法解析它，因为数组上有一个字符串。

输入文件:

{
"rooms":[
        {"maxOccupants":"10",
         "schedule":[{"startTime":"1","day":"10"},{"startTime":"20","day":"20"},{"startTime":"11","day":"122017"}],
         "tv":"false",
         "mobilePhone":"false",
         "projector":"true",
         "buildID":"1",
         "floor":"2",
         "roomName":"room1"},

         {"maxOccupants":"4",
         "schedule":[{"startTime":"10","day":"1"},{"startTime":"11","day":"122017"},{"startTime":"11","day":"15"}],
         "tv":"false",
         "mobilePhone":"false",
         "projector":"false",
         "buildID":"1",
         "floor":"2",
         "roomName":"room2"},

         {"maxOccupants":"5",
         "schedule":[{"startTime":"1","day":"10"},{"startTime":"11","day":"122017"}],
         "tv":"false",
         "mobilePhone":"false",
         "projector":"true",
         "buildID":"2",
         "floor":"3",
         "roomName":"room3"}

         ]
}

Answer 1

问题解决了!我没有创建 JSONObject，因此我直接向 JSON Array 引入一个对象，并强制与 String 进行对话。

问题的解决方法如下:

 JSONObject jsonObj = new JSONObject();
 String startTime = String.valueOf(r.getStartTime());
 String day = String.valueOf(r.getDay());

 jsonObj.put("startTime", startTime);
 jsonObj.put("day", day);
 schedule.add(jsonObj);