我的 json 文件包含,
{
"appointments": [
{
"appointmentId": "app_001",
"appointmentTitle": "Appointment Title1",
"appointmentDate": "2017-11-25",
"appointmentTime": "10:30",
"appointmentStatus": "active",
"appointmentType": "meeting",
"reminder": {
"type": "notification",
"time": "10:15",
"status": "off"
},
"appointmentDescription": "blablablablabla1"
},
{
"appointmentId": "app_002",
"appointmentTitle": "AppointmentTitle2",
"appointmentDate": "2017-11-26",
"appointmentTime": "09:00",
"appointmentStatus": "done",
"appointmentType": "exam",
"reminder": {
"type": "alarm",
"time": "08:45",
"status": "on"
},
"appointmentDescription": "blablablablabla2"
}
]
}
我需要将另一个 jsonobject 放入数组中,输出应该是这样的,
{
"appointments": [
{
"appointmentId": "app_001",
"appointmentTitle": "Appointment Title1",
"appointmentDate": "2017-11-25",
"appointmentTime": "10:30",
"appointmentStatus": "active",
"appointmentType": "meeting",
"reminder": {
"type": "notification",
"time": "10:15",
"status": "off"
},
"appointmentDescription": "blablablablabla1"
},
{
"appointmentId": "app_002",
"appointmentTitle": "AppointmentTitle2",
"appointmentDate": "2017-11-26",
"appointmentTime": "09:00",
"appointmentStatus": "done",
"appointmentType": "exam",
"reminder": {
"type": "alarm",
"time": "08:45",
"status": "on"
},
"appointmentDescription": "blablablablabla2"
},
{
"appointmentId": "app_003",
"appointmentTitle": "AppointmentTitle3",
"appointmentDate": "2017-11-26",
"appointmentTime": "09:00",
"appointmentStatus": "done",
"appointmentType": "exam",
"reminder": {
"type": "alarm",
"time": "08:45",
"status": "on"
},
"appointmentDescription": "blablablablabla3"
}
]
}
我使用以下代码段执行我的要求。
File fileJson = new File(getApplicationContext().getExternalFilesDir("/app"), "app.json");
String strFileJson = getStringFromFile(fileJson.toString());
JSONObject jsonObj = new JSONObject(strFileJson);
jsonObj.put("appointmentId", "app_002");
jsonObj.put("appointmentTitle", "Appointment Title2");
jsonObj.put("appointmentDate", "2017-11-21");
jsonObj.put("appointmentTime", "01:30");
jsonObj.put("appointmentStatus", "active");
jsonObj.put("appointmentType", "meeting");
JSONObject reminder = new JSONObject();
reminder.put("type", "note");
reminder.put("time", "12:30");
reminder.put("status", "off");
jsonObj.put("reminder", reminder);
jsonObj.put("appointmentDescription", "blablablablabla2");
writeJsonFile(fileJson, jsonObj.toString());
writeJsonFile
、getStringFromFile
、convertStreamToString
函数是,
public static String getStringFromFile(String filePath) throws Exception {
File fl = new File(filePath);
FileInputStream fin = new FileInputStream(fl);
String ret = convertStreamToString(fin);
//Make sure you close all streams.
fin.close();
return ret;
}
public static String convertStreamToString(InputStream is) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
}
return sb.toString();
}
public static void writeJsonFile(File file, String json) {
BufferedWriter bufferedWriter = null;
try {
if (!file.exists()) {
Log.e("App","file not exist");
file.createNewFile();
}
FileWriter fileWriter = new FileWriter(file);
bufferedWriter = new BufferedWriter(fileWriter);
bufferedWriter.write(json);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (bufferedWriter != null) {
bufferedWriter.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
但我得到的输出是,
{
"appointments": [
{
"appointmentId": "app_001",
"appointmentTitle": "Appointment Title1",
"appointmentDate": "2017-11-25",
"appointmentTime": "10:30",
"appointmentStatus": "active",
"appointmentType": "meeting",
"reminder": {
"type": "notification",
"time": "10:15",
"status": "off"
},
"appointmentDescription": "blablablablabla1"
},
{
"appointmentId": "app_002",
"appointmentTitle": "AppointmentTitle2",
"appointmentDate": "2017-11-26",
"appointmentTime": "09:00",
"appointmentStatus": "done",
"appointmentType": "exam",
"reminder": {
"type": "alarm",
"time": "08:45",
"status": "on"
},
"appointmentDescription": "blablablablabla2"
}
],
"appointmentId": "app_002",
"appointmentTitle": "Appointment Title2",
"appointmentDate": "2017-11-21",
"appointmentTime": "01:30",
"appointmentStatus": "active",
"appointmentType": "meeting",
"reminder": {
"type": "note",
"time": "12:30",
"status": "off"
},
"appointmentDescription": "blablablablabla2"
}
请帮助我获得所需的 json 格式作为输出。提前致谢
最佳答案
希望这会做你想做的,替换你的
JSONObject jsonObj = new JSONObject(strFileJson);
jsonObj.put("appointmentId", "app_002");
jsonObj.put("appointmentTitle", "Appointment Title2");
jsonObj.put("appointmentDate", "2017-11-21");
jsonObj.put("appointmentTime", "01:30");
jsonObj.put("appointmentStatus", "active");
jsonObj.put("appointmentType", "meeting");
JSONObject reminder = new JSONObject();
reminder.put("type", "note");
reminder.put("time", "12:30");
reminder.put("status", "off");
jsonObj.put("reminder", reminder);
jsonObj.put("appointmentDescription", "blablablablabla2");
有了这个,
JSONObject PreviousJsonObj = new JSONObject(strFileJson);
JSONArray array = PreviousJsonObj.getJSONArray("appointments");
JSONObject jsonObj= new JSONObject();
jsonObj.put("appointmentId", "app_002");
jsonObj.put("appointmentTitle", "Appointment Title2");
jsonObj.put("appointmentDate", "2017-11-21");
jsonObj.put("appointmentTime", "01:30");
jsonObj.put("appointmentStatus", "active");
jsonObj.put("appointmentType", "meeting");
JSONObject reminder = new JSONObject();
reminder.put("type", "note");
reminder.put("time", "12:30");
reminder.put("status", "off");
jsonObj.put("reminder", reminder);
jsonObj.put("appointmentDescription", "blablablablabla2");
array.put(jsonObj);
JSONObject currentJsonObject = new JSONObject();
currentJsonObject.put("appointments",array);
关于android - 如何将 Json 对象附加到 android 中现有的 json 文件中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47427905/