We Keep Coding

Sorting the json file

Hi I am working on a project it will show USD EUR TRY Bitcoin Gold values i have api for all of this values in json i want to sort them out my json link is this https://canlidoviz.com/doviz-kurlari.jsonld
I am parsing the json with this class
public class ClassJSONParser {
private InputStream is = null;
private JSONObject jObj = null;
private String json = "";
public ClassJSONParser(){
}
public JSONObject getJSONFromURL(String url) {
try {
URL urlObject = new java.net.URL(url);
HttpURLConnection conn=(HttpURLConnection) urlObject.openConnection();
conn.setRequestMethod("GET");
is = new BufferedInputStream(conn.getInputStream());
} catch (IOException e){
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF-8"),8);
StringBuilder sb = new StringBuilder();
String line;
while ((line=reader.readLine())!=null){
String tmp = line + "/n";
sb.append(tmp);
}
is.close();
json=sb.toString();
}catch (Exception e){
Log.i("Buffer Error","Error Converting Result"+e.toString());
}
try {
if(json !=null){
jObj=new JSONObject(json);
}else{
jObj=null;
}
}catch (JSONException e){
}
return jObj;
}
}
and getting a string like this
ClassJSONParser jParser = new ClassJSONParser();
String url = "https://canlidoviz.com/doviz-kurlari.jsonld";
jsonO= jParser.getJSONFromURL(url);
Log.d("***",jsonO.toString());
what method should i use how can i do can you give me guidance

How can I convert an ArrayList to JSON Object to be able to iterate through it in Java?

I am trying to loop through a json object I pulled through the web but I can't seem to convert it from a string to a jsonarray or jsonobject. I want to be able to use a for loop to iterate through it and then conditionally output names based on some values.
This is a simple java program to demonstrate pulling json data from a web api and then looping through it.
Here's the code:
public static List<String> getUsernames(int threshold) throws IOException {
List<String> usernames = new ArrayList<>();
BufferedReader reader;
String line;
StringBuffer responseContent = new StringBuffer();
try {
URL url = new URL("url to json api");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//Request method
connection.setRequestMethod("GET");
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
int status = connection.getResponseCode();
System.out.println(status);
if (status > 299) {
reader = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
while ((line = reader.readLine()) != null) {
responseContent.append(line);
}
reader.close();
} else {
reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
while ((line = reader.readLine()) != null) {
usernames.add(line);
}
// String json = new Gson().toJson(usernames);
//
// JSONArray jsonarray = new JSONArray(json);
// System.out.println(json);
Gson gson = new Gson();
reader.close();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return usernames;
}

List<String> usernames = new ArrayList<>();
usernames.add("Hibernate");
usernames.add("spring");
JSONArray jsonStr = new JSONArray().put(usernames);
for (Object values: jsonStr) {
System.out.println(values);
}

how to return a json string in php for using it in java

I want wrote an API in php for using it in my android app. In the php side I do this for return info in an array
echo json_encode($array)
result of this code is like this, see online result in this link:
{"value":[{"id":"1","name":"kufta","meal":"1","photo_id":"","explanation":"xoshmazas","foodtime":"0000-00-0000:00:00"},{"id":"2","name":"\r\nAsh","meal":"2","photo_id":"","explanation":"sdfdsfsdfdsfdsfsdf","foodtime":"2017-06-26 14:00:00"},{"id":"3","name":"kabab","meal":"3","photo_id":"","explanation":"kabab kheili khoshmaze ast","foodtime":"2017-06-29 00:00:00"}]}
but in java side when I load this, app crash but when I use this json string in this site. Android app works fine
my java code for reading the url content
public class WebService {
private String connectToServer(String address, String requestMethod) {
try {
URL url = new URL(address);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod(requestMethod);
return inputStreamToString(httpURLConnection.getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private String inputStreamToString(InputStream inputStream) {
StringBuilder stringBuilder = new StringBuilder();
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String nextLine;
while ((nextLine = reader.readLine()) != null) {
stringBuilder.append(nextLine);
}
} catch (IOException e) {
e.printStackTrace();
}
return stringBuilder.toString();
}
line 23 : public List<FoodModel> getFoods(){ <-----------Error is here
String response = connectToServer("http://mtg1376.gigfa.com/api/food?day=All","GET");
if(response != null){
List<FoodModel> foodList = new ArrayList<😠);
try{
JSONObject mainObject = new JSONObject(response);
JSONArray foodArray = mainObject.getJSONArray("value");
for(int i = 0 ; i< foodArray.length();i++){
JSONObject foodObject = foodArray.getJSONObject(i);
FoodModel foodModel = new FoodModel();
foodModel.id = foodObject.getString("id");
foodModel.name = foodObject.getString("name");
foodModel.meal = foodObject.getString("meal");
foodModel.photo_id = foodObject.getString("photo_id");
foodModel.explanation = foodObject.getString("explanation");
foodModel.foodtime=foodObject.getString("foodtime");
foodList.add(foodModel);
}
return foodList;
} catch (JSONException e) {
e.printStackTrace();
}
}
return null; }
}
java error log : https://ibb.co/hQneXk
whats the problem?

JSON retriving data from HttpURLConnection

I've been following a tutorial which provided an example website to use in the json request, however when i put in my own website to scrape data from, nothing happens.
Here is my code;
private TextView tvData;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvData = (TextView) findViewById(R.id.tvJsonItem);
new JSONTask().execute("http://jsonparsing.parseapp.com/jsonData/moviesDemoItem.txt");
}
public class JSONTask extends AsyncTask<String,String, String>{
#Override
protected String doInBackground(String ... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
String finalJson = buffer.toString();
JSONObject parentObject = new JSONObject(finalJson);
JSONArray parentArray = parentObject.getJSONArray("movies");
JSONObject finalObject = parentArray.getJSONObject(0);
String ChampionName = finalObject.getString("movie");
String mostGames = finalObject.getString("year");
return ChampionName + mostGames;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(String result){
super.onPostExecute(result);
tvData.setText(result);
}
}
}
Screen of when it works on left and screen when it doesnt work on right.
So yeah, this is what i know i have to change
new JSONTask().execute("http://api.champion.gg/champion/Ekko");
and
JSONObject parentObject = new JSONObject(finalJson);
JSONArray parentArray = parentObject.getJSONArray("WHAT DO I PUT HERE");
JSONObject finalObject = parentArray.getJSONObject(0);
String ChampionName = finalObject.getString("WHAT DO I PUT HERE");
String mostGames = finalObject.getString("WHAT DO I PUT HERE");
From this URL - http://api.champion.gg/champion/Ekko/ , i want to get lets say the first two fields "key":"Ekko","role":"Top", so if anyone could give me a hand, that would be great!

According to the JSON returned form your link http://api.champion.gg/champion/Ekko/
You have to start to parse your string response as JSONArray
JSONArray parentObject = new JSONArray(finalJson);
then start to loop through this array to get JSONObject
JSONObject jsonObject = parentObject.getJSONObject(yourLoopIndex);
Inside each JSONObject you can get any value. by using the key in the original JSON string.

How to pass and read string from android to sql using JSON

Previously, i can access the string from php remotely. I find it difficult at first but AsyncTask did the work for me. Now, i can access the result of the query from php to sql server. But I would like to pass a string from my java class to php and as I googled some information, i saw some JSON post and get codes but i can't clearly understand them. Here's my code:
protected String doInBackground(Void... params) {
BufferedReader br = null;
StringBuilder sb = new StringBuilder();
String url = "http://122.2.8.226/MITBookstore/sqlconnect.php";
HttpURLConnection urlConnection = null;
String line;
try {
urlConnection = (HttpURLConnection) new URL(url).openConnection();
InputStream in = urlConnection.getInputStream();
br = new BufferedReader(new InputStreamReader(in));
while ((line = br.readLine()) != null) {
sb.append(line);
}
}
catch (Exception e) {
e.printStackTrace();
}
finally {
if (br != null) {
try {
br.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
return sb.toString();
The string is contained in "sb.toString()". Now how would I add a JSON something in my code to send string from java to php, and also get the result string from php to java as well. Thanks in advance for any help.

If you receive response as JSON format from server, make the json string to JSONObject first. And then read the json data for your use.
try {
JSONObject obj = new JSONObject(sb.toString()); // make string to json obj
Iterator iter = obj.keys(); // get all keys from json obj and iterating
while(iter.hasNext()){
String key = (String)iter.next();
String str = obj.get(key).toString();
// write your code
}
} catch(Exception e) {
e.printStackTrace();
}
Your code already contains the answer of your question. After make url connection, just add parameter for sending your data to server with OutputStreamWriter as like you did for receive the response with InpustStreamReader.
BufferedReader br = null;
StringBuilder sb = new StringBuilder();
String url = "http://122.2.8.226/MITBookstore/sqlconnect.php";
HttpURLConnection urlConnection = null;
String line;
try {
urlConnection = (HttpURLConnection) new URL(url).openConnection();
// wrtie params
OutputStreamWriter we = new OutputStreamWriter(urlConnection.getOutPutStream());
wr.write(data); // data (make json obj to 'key=value' string)
wr.flush();
wr.close();
// read response
InputStream in = urlConnection.getInputStream();
br = new BufferedReader(new InputStreamReader(in));
while ((line = br.readLine()) != null) {
sb.append(line);
}
}
catch (Exception e) {
e.printStackTrace();
}
finally {
if (br != null) {
try {
br.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}enter code here