Develop Reference

Android error: java.net.SocketException Socket is closed

I get java socket is closed exception meanwhile I am trying to read the response that I got from my web service. My web service sends a JSON as a response and the http code response is always 200 but I do not know if the response String is so long that BufferedReader crash when I try to use readLine(). If the issue is my response size, there is another way to get my json response?
I already used postman to be secured that my web service is working without problems, so I get my json responde as I want.
I use this same format of code to call other web services that I have and I do not have this issue. And actually, this code worked well before, since yesterday that I have this problem.
The error arises in the while below
try {
url = new URL(ws);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "application/json");
//HEADERS
connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestProperty("Accept", "application/json");
connection.setRequestProperty("User-Agent", "Mozilla/5.0" + " (Linux; Android 1.5; es-ES) Ejemplo HTTP");
connection.connect();
OutputStream outputStream = connection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, StandardCharsets.UTF_8));
bufferedWriter.write(jsonObject.toString());
bufferedWriter.flush();
bufferedWriter.close();
int response = connection.getResponseCode();
connection.disconnect();
StringBuilder result = new StringBuilder();
if (response == HttpURLConnection.HTTP_OK) {
InputStream input = new BufferedInputStream(connection.getInputStream());
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
if (!result.toString().equals("null")) {
JSONArray jsonResult = new JSONArray(result.toString());
if (jsonResult.length() > 0) {
//code to use JSON response info
} else {
//code to show alert dialog error
}
} else {
//code to show alert dialog error
}
} else {
//code to show alert dialog error
}
} catch (Exception e) {
Log.i("JSONWSResponse error: ", e.toString());
//code to show alert dialog error
}

Java how to send special character is post

Im trying to send a post to a backend API from android and this is what I have but some special characters relating to application/x-www-form-urlencoded content type wont be sent or cause problems. Im wondering if there is a way to send the special characters in this format? (+,&) I'm attempting to send the message "This is a message + a test" but my database is getting "This is a message a test"
I've tried passing JSON but the backend that my co-students wrote doesn't accept JSON and returns a 401 not authorized error.
public void sendMessage() {
if(!mEdit.getText().toString().trim().matches("")) { //Cant send empty strings
Thread thread = new Thread(new Runnable() {
#Override
public void run() {
try {
URL url = new URL(Sendurl); //Create URL
HttpURLConnection conn = (HttpURLConnection) url.openConnection(); //Create a Connector
conn.setRequestMethod("POST"); //Dictate the Method
conn.setRequestProperty("Content-Type", "application/json; utf-8"); //Some other properties
conn.setRequestProperty("Accept", "application/json");
conn.setDoOutput(true);
conn.setDoInput(true);
//This part causes a 401 error because it is the equivalent of passing parameters but our backend uses body formatting
JSONObject jsonParam = new JSONObject();
Date date = new Date();
RequestParams params = new RequestParams();
params.put("username", "admin");
params.put("sessionID", 1);
params.put("cardNum", 111111111);
params.put("sentByStaff", "false");
params.put("message", "This is the message + a test");
params.put("time", date.getTime()/1000);
Log.i("JSON", params.toString());
// OutputStreamWriter os = new OutputStreamWriter(conn.getOutputStream()); //Prepare the connection for output
POST_PARAMS = params.toString(); //Converts post parameters to body type
System.out.println(POST_PARAMS);
try(OutputStream os = conn.getOutputStream()) {
byte[] input = POST_PARAMS.getBytes("utf-8");
os.write(input, 0, input.length);
os.flush();
os.close();
}
//os.write(POST_PARAMS); //Write our parameters to the post
//os.flush(); //Do the thing
//os.close();
Log.i("STATUS", String.valueOf(conn.getResponseCode())); //Debug
Log.i("MSG", conn.getResponseMessage()); //Debug
int responseCode = 0; //get response code
responseCode = conn.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) { //On success
mEdit.setText("");
}
conn.disconnect(); //disconnect after attempting post
getMessage(); //update our messages
} catch (Exception e) { //dirty catch all
e.printStackTrace();
}
}
});
thread.start();
}
}

Can't send JSON in a Java HTTP POST request

I'm getting a 'Server returned HTTP response code: 500' error although I have checked what I'm sending (I even tried sending it with an online tool and it worked). The API Key and the JSON are correct. I get this error when trying to read the input stream with 'connection.getInputStream()'. Where could this be comming frome ? Did I forget something ? I am trying to implement this feature from the openrouteservice API : https://openrouteservice.org/dev/#/api-docs/v2/directions/{profile}/post
public static UPSRoute getRoute(Location start, Location end, String language) {
if (language.equals("fr")) {
JSONObject jsonObject = null;
try {
URL url = new URL("https://api.openrouteservice.org/v2/directions/foot-walking");
String payload = "{\"coordinates\":[[" + start.getCoordinates() + "],[" + end.getCoordinates() + "]],\"language\":\"fr\"}";
System.out.println(payload); //{"coordinates":[[1.463478,43.562038],[1.471717,43.560787]],"language":"fr"}
byte[] postData = payload.getBytes(StandardCharsets.UTF_8);
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Authorization", API_KEY);
connection.setRequestProperty("Accept", "application/json, application/geo+json, application/gpx+xml, img/png; charset=utf-8");
connection.setDoOutput(true);
try (DataOutputStream wr = new DataOutputStream(connection.getOutputStream())) {
wr.write(postData);
}
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream())); // Error is right here
String inputLine;
StringBuffer content = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
content.append(inputLine);
}
in.close();
connection.disconnect();
jsonObject = new JSONObject(content.toString());
} catch (IOException | JSONException e) {
e.printStackTrace();
}
return new UPSRoute(jsonObject);
} else {
return getRoute(start, end);
}
}
Here is the error :
java.io.IOException: Server returned HTTP response code: 500 for URL: https://api.openrouteservice.org/v2/directions/foot-walking/json
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1913)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1509)
at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:245)
at UPSRouteService.getRoute(UPSRouteService.java:63)
at Main.main(Main.java:5)

Thanks to Andreas, it was just missing the line :
connection.setRequestProperty("Content-Type", "application/json");
It works fine now.

How to post JSON body to an API with Basic Authentication using Java?

I am calling Traccar API from my AsyncTask class. I need to pass JSON and Basic Authentication using POST method. I have this inside my doInBackground but it returns 400 Bad Request. I cannot pinpoint what's wrong. I'm pretty sure URL and credentials are all correct.
String credentials= "my_username:my_password";
String credBase64 = Base64.encodeToString(credentials.getBytes(), Base64.DEFAULT).replace("\n", "");
URL url = new URL("https://server.traccar.org/api/devices");
HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
urlConnection.setDoInput(true);
urlConnection.setDoOutput(true);
urlConnection.setRequestProperty("Content-Type", "application/json");
urlConnection.setRequestMethod("POST");
urlConnection.setRequestProperty("Authorization", credBase64);
if (this.postData!=null)
{
OutputStreamWriter writer = new OutputStreamWriter(urlConnection.getOutputStream());
writer.write(this.postData.toString());
writer.flush();
}
int statusCode = urlConnection.getResponseCode();
if(statusCode == 200)
{
InputStream inputStream = new BufferedInputStream(urlConnection.getInputStream());
String response = inputStream.toString();
}
else
{
Log.e(TAG, "Error" + statusCode);
}

How to query Github graphql API with java using HttpUrlConnect

I don't know what is wrong with my code I keep getting error 401 when I try making a request to the GitHub. My app uses the REST API before now I and to convert it to the Graphql but I am finding it difficult
private static String makeHttpRequest(URL url) throws IOException {
String jsonResponse = "";
// If the URL is null, then return early.
if (url == null) {
return jsonResponse;
}
HttpURLConnection urlConnection = null;
InputStream inputStream = null;
try {
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(10000 /* milliseconds */);
urlConnection.setConnectTimeout(15000 /* milliseconds */);
urlConnection.setRequestMethod("POST");
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.setRequestProperty("Authorization","Bearer token");
urlConnection.setRequestProperty("Content-Type", "application/json");
DataOutputStream wr = new DataOutputStream(urlConnection.getOutputStream());
wr.writeBytes("{\"query\":\"query{search(type:USER query:\"location:lagos language:java\"){userCount}}}");
wr.flush();
wr.close();
int rc = urlConnection.getResponseCode();
inputStream = urlConnection.getInputStream();
jsonResponse = readFromStream(inputStream);
} catch (IOException e) {
Log.e(LOG_TAG, "Problem retrieving the earthquake JSON results.", e);
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (inputStream != null) {
inputStream.close();
}
}
return jsonResponse;
}

Found the mistake
There was a problem with my token and the query format was wrong it should have been
"{\"query\": \"query { search ( type : USER, query : \\\"location:lagos\\\" ) { userCount }}\"}"
Thank for your suggestion

The Authorization header token might not be valid. HTTP 401 = not authorized.

I'd suggest trying to make same request with a Curl and when you see success - apply same parameters/headers to HttpUrlConnection.