Question

我正在阅读JSON文件，取出值并进行一些更改。

基本上我在数组中添加了一些值。之后我想把它写回一个文件。当我将JSONArray写回文件时写为字符串而不是JSONArray对象。我怎么写得好呢？

在以下代码中我写入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();

正如您所看到的，正在被写为字符串，当我想要阅读它时它会给我带来问题。

"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));
}

错误：java.lang.ClassCastException：无法强制转换java.lang.String to org.json.simple.JSONObject

在向数组输入新值（引入日期和开始时间）后发生错误。它写成字符串，当我再次尝试阅读时，给我一个错误，说我无法解析它，因为阵列上有一个字符串。

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，因此我将一个直接对象引入JSON数组，并强制将对话转换为String。

以下是问题的解决方法：

 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);

写入JSONArray

1 个答案: