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，Out put应该是，
{
"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_003",
"appointmentTitle": "AppointmentTitle3",
"appointmentDate": "2017-11-26",
"appointmentTime": "09:00",
"appointmentStatus": "done",
"appointmentType": "exam",
"reminder": {
"type": "alarm",
"time": "08:45",
"status": "on"
},
"appointmentDescription": "blablablablabla3"
}
]
}
我使用以下代码段来执行我的要求。
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"
}
请帮助我获取所需的json格式作为输出。提前致谢
答案 0 :(得分：1)
你几乎走在正确的轨道上。您只需在JSONObject内添加JSONArray即可。试试这个
JSONObject OldJsonObj = new JSONObject(strFileJson);
JSONArray array = OldJsonObj.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); // put the data in array
JSONObject newJsonObject = new JSONObject(array.toString());
writeJsonFile(fileJson, newJsonObject .toString());
答案 1 :(得分：1)
希望这可以做你想要的，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);
答案 2 :(得分：0)
您可以使用FileWriter写入文本文件。使用以下代码：
try{
FileWriter fileWriter = new FileWriter(Environment.getExternalStorageDirectory().getPath() + "/Android/data/com.StampWallet/" + "SBLog.txt", true);
fileWriter.write("Hello");
fileWrite.close();
}catch(IOException e){
}
了解更多信息，请访问here
您可以使用Gson转换字符串中的对象，反之亦然。
答案 3 :(得分：0)
您必须在JSONArray appointments中添加JSONObject，试试这个
JSONObject jsonObject=new JSONObject(strFileJson);
JSONObject jsonObj=new JSONObject();
JSONObject jObj=new JSONObject();
try {
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");
jObj.put("type", "note");
jObj.put("time", "12:30");
jObj.put("status", "off");
jsonObj.put("reminder",jObj);
JSONArray jsonArray=jsonObject.getJSONArray("appointments");
jsonArray.put(jsonObj);
} catch (JSONException e) {
e.printStackTrace();
}
答案 4 :(得分：0)
您需要首先从json文件中获取所有json对象，对其进行解析，然后向其添加新的json数组，最后将其保存回该文件中。
答案 5 :(得分：-1)
这是将新字符串附加到现有 Json 文件并使其格式正确的方法。
public void runCheck() throws Exception {
String fileName= "E:\\stores.json"; //my existing json file
//this methods first gets the existing json string from our file.
BufferedReader br = new BufferedReader(new FileReader(fileName));
StringBuilder sb = new StringBuilder();
line = br.readLine();
while (line != null) {
sb.append(line);
sb.append("\n");
line = br.readLine();
}
br.close();
String mk="suraj"; //variable to be inserted in my new json
//this methods removes the trailing bracket so that i can append my new json
String str =sb.toString();
String sourceWord="}";
StringBuilder strb=new StringBuilder(str);
int index=strb.lastIndexOf(sourceWord);
strb.replace(index,sourceWord.length()+index,"");
System.out.println(strb.toString());
FileWriter fws = new FileWriter(fileName,false);
fws.write(strb.toString());//appends the string to the file
fws.close();
//now the method to insert new json
FileWriter fw = new FileWriter(fileName,true); //the true will append the new data
String json = " , \n"
+ "\""
+ mk
+ "\": \n"
+ "{ \n"
+ " \"prod\": \n"
+ "{ \n"
+ " \"MAGENTO_ADMIN_PASSWORD\": \""
+ mk
+ "\", \n"
+ " \"MAGENTO_ADMIN_USERNAME\" : \""
+ mk
+ "\", \n"
+ " \"MAGENTO_BACKEND_NAME\" : \""
+ mk
+ "\", \n"
+ " \"MAGENTO_BASE_URL\" : \""
+ mk
+ "\" \n"
+ " }, \n"
+ " \"uat\": \n"
+ " { \n"
+ " \"MAGENTO_ADMIN_PASSWORD\": \""
+ mk
+ "\", \n"
+ " \"MAGENTO_ADMIN_USERNAME\" : \""
+ mk
+ "\", \n"
+ " \"MAGENTO_BACKEND_NAME\" : \""
+ mk
+ "\", \n"
+ " \"MAGENTO_BASE_URL\" : \""
+mk
+ "\" \n"
+ " }, \n"
+ " \"stag\": \n"
+ " { \n"
+ " \"MAGENTO_ADMIN_PASSWORD\": \""
+ mk
+ "\", \n"
+ " \"MAGENTO_ADMIN_USERNAME\" : \""
+ mk
+ "\", \n"
+ " \"MAGENTO_BACKEND_NAME\" : \""
+ mk
+ "\",\n"
+ " \"MAGENTO_BASE_URL\" : \""
+ mk
+ "\" \n"
+ " } \n"
+ "} \n";
fw.write(json);//appends the string to the file
fw.write( "} \n"); //append my closing bracket, You can modify as per your convinience.
fw.close();
}