I have one application that posts json data like below
{
"image": "data:image/png;base64,eAvQPaQEJCABCUjg/wNeEta73J3yXwAAAABJRU5ErkJggg==................"
}
It posts image(png or jpg) base64 byte array in the "image" key.
I want to save that image under the name "datetime.png" into my specified location.
For this I am using the code below:
#POST
#Consumes("application/x-www-form-urlencoded")
#Path("/getImage")
public Response GetImage(String json) {
java.util.Date dt = new java.util.Date();
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sdf.setTimeZone(TimeZone.getTimeZone("IST"));
String currentTime = sdf.format(dt);
JSONObject returnJson = new JSONObject();
try {
JSONObject innerJsonObj = new JSONObject(json);
String imageCode=innerJsonObj.getString("image");
String base64Image = imageCode.split(",")[1];
byte[] imageBytes = javax.xml.bind.DatatypeConverter.parseBase64Binary(base64Image);
FileOutputStream fos = new FileOutputStream("D:\\image\\" + currentTime + ".png");
try {
fos.write(imageBytes);
} finally {
fos.close();
}
returnJson.put("success", true);
} catch (Exception e) {
JSONObject errorJson = new JSONObject();
errorJson.put("success", false);
return Response.ok(errorJson.toString()).header("Access-Control-Allow-Origin", "*").build();
}
return Response.ok(returnJson.toString()).header("Access-Control-Allow-Origin", "*").build();
}
But it gives me the following Error
java.io.FileNotFoundException: D:\image\2016-07-15 17:04:34.png (The
filename, directory name, or volume label syntax is incorrect)
Related
I would like to work on moving the json data from libgdx to my web server, but I am not sure how to do it. The method below was created by referring to libgdx's documentation.
private void httpPostJson(){
final Json json = new Json();
final String requestJson = json.toJson(requestObject);
Net.HttpRequest request = new Net.HttpRequest("POST");
final String url = "http://localhost:8080/data";
request.setUrl(url);
request.setContent(requestJson);
request.setHeader("Content-Type", "application/json");
Gdx.net.sendHttpRequest(request, new Net.HttpResponseListener() {
#Override
public void handleHttpResponse(Net.HttpResponse httpResponse) {
String responseJson = httpResponse.getResultAsString();
Gson gson = new Gson();
data = gson.fromJson(responseJson, Person.class);
//'Person' is just sample class. data is class Person's object.
data.StoreData("",1);//successed to receive json data from web server.
//StoreData is just getter method.
}
#Override
public void failed(Throwable t) {
Gdx.app.log("failed!");
}
#Override
public void cancelled() {
Gdx.app.log("cancelled!");
}
});
}
It is possible to receive data transmitted from a web server.
But, this method can't send data to web server.
Can you tell me how to move data from libgdx project to web server?
This is the data transmitted to the web server:
final String requestJson = json.toJson(requestObject);
We are using the following Code (as you have more control over the request as opposed to using gdx.net), works like a charm, just don't execute on the main thread - body is your JSON as String
URL url = new URL(<your url>);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestProperty("Accept", "application/json");
conn.setRequestProperty("Content-Type",
"application/json; charset=utf-8");
if (body != null) {
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(
os, "UTF-8"));
writer.write(body);
writer.close();
os.close();
}
conn.connect();
String s = stringFromStream(conn.getInputStream(), 4096);
Method stringFromStream:
public static String stringFromStream(final InputStream is,
final int bufferSize) {
final char[] buffer = new char[bufferSize];
final StringBuilder out = new StringBuilder();
try {
final Reader in = new InputStreamReader(is, "UTF-8");
try {
for (; ; ) {
int rsz = in.read(buffer, 0, buffer.length);
if (rsz < 0)
break;
out.append(buffer, 0, rsz);
}
} finally {
in.close();
}
} catch (Exception ex) {
}
return out.toString();
}
I am trying to Parse JSON Data get From URL and Insert Data to Firebase from response using asynctask.Below is the code I have written but it is not inserting any data to Firebase.My Firebase Reference is correct as I log.e Below is the code
JSONArray arr = new JSONArray(result);
mDatabase = FirebaseDatabase.getInstance().getReference().child(context.getResources().getText(R.string.bid_request).toString().trim()).child("b");
for(int i=0; i < arr.length(); i++) {
JSONObject obj = arr.getJSONObject(i);
Map<String, Object> userValues = new HashMap<>();
final String node = obj.getString("mysql_id");
final String id = obj.getString("id");
DatabaseReference newBid = mDatabase.child(node);
String data = obj.getString("new_comer");
String[] items = data.split(",");
for (String item : items) {
userValues.put(item, 1);
}
serValues.put("tReq", obj.getString("tReq"));
newBid.setValue(userValues, new DatabaseReference.CompletionListener() {
#Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if(databaseError!=null){
Log.e("error", "onComplete: "+databaseError);
}
}
});
And below is the Error showing in my log.Can not figure out what is wrong I am doing
E/myapp: onPostExecute: org.json.JSONException: Value [{"id":"14248","mysql_id":"a6555018-de41-4fc7-942e-530389aa3a9d","tReq":"4","new_comer":"10019,10029"}] at 0 of type org.json.JSONArray cannot be converted to JSONObject
I convert Xml Data to Json Data and my input in xml file or text file is:-
//**xml input:- <data>34123456.00</data>**
String jsonFileName = "src\\main\\resources\\Light.json";
try {
File xmlFile = new File("src\\main\\resources\\output.txt");
InputStream inputStream = new FileInputStream(xmlFile);
StringBuilder builder = new StringBuilder();
int ptr;
while ((ptr = inputStream.read()) != -1) {
builder.append((char) ptr);
}
String xml = builder.toString();
JSONObject jsonObj = XML.toJSONObject(xml);
System.out.print(jsonObj);
FileWriter fileWriter =
new FileWriter(jsonFileName);
// Always wrap FileWriter in BufferedWriter.
BufferedWriter bufferedWriter =
new BufferedWriter(fileWriter);
bufferedWriter.write(jsonObj.toString(PRETTY_FACTOR));
bufferedWriter.close();
} catch (IOException ex) {
System.out.println(
"Error writing to file '"
+ jsonFileName + "'");
} catch (Exception e) {
e.printStackTrace();
} /* json output is :- {"data":3.4123456E7}
I want Output as :- {"data":34123456.00} */
but i dont want exponential form in json format i want complete number so how i do this in Java ?
JSONObject jsonObj = XML.toJSONObject(xml,true);
write above line instead of
JSONObject jsonObj = XML.toJSONObject(xml);
this solves my problem.
I want to access a JSON of this structure in firebase
The structure
{
"questions":{
"English":{
"English_2002":[
{
"correct_ans":"A",
"OptionA":"a coder",
"OptionB":"a hacker",
"OptionC":"a writer",
"OptionD":"a programmer",
"Question":"Who build software"
},
{},
{}
],
"English_2003":[],
}
}
}
I want this structure. In the subject structure, other subjects will come after I exhaust 9 years of English.
My confusion is how to logically get each subject since firebase will only accept the root name questions.
Please I may sound dumb, but I have a very long questions thread almost 55000 lines. Because firebase accept one JSON tree.
Sorry i wasn't very clear i was asking from the stack phone app:
I have a question json tag of the structure above; my question is how will i be able to access the object subject like "english":{
// then accessing the first english array "english":[]
//since am now using firebase.
}
initially each array was individual json file, i have to recreate them into one for firebase sake. this is how i was parsing it then.
public class QuestionParser {
Context context;
public QuestionParser(Context c) {
this.context = c;
}
public ArrayList<Question> getJsonFromUrl(String url, String arrayName)
{
ArrayList<Question> arrayofQuestion = new ArrayList<>();
return arrayofQuestion;
}
// Processing question from JSon file in res > raw folder
public ArrayList<Question> parseQuestionJson(int rawJsonFileId, String arrayName) {
ArrayList<Question> questionList = new ArrayList<>();
String jsonstr = null;
try {
InputStream in = context.getResources().openRawResource(rawJsonFileId);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
jsonstr = sb.toString();
Log.d("REEEEADDD" + this.toString(), jsonstr);
//System.out.println(jsonstr);
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// If the JSON string is empty or null, then return early.
if (TextUtils.isEmpty(jsonstr)) {
return null;
}
try {
JSONObject jsonObject = new JSONObject(jsonstr);
JSONArray jsonArray = jsonObject.getJSONArray(arrayName);
JSONObject jobject;
for (int i = 0; i < jsonArray.length(); i++) {
// TEST
jobject = jsonArray.getJSONObject(i);
String ans = jobject.getString("correct_answer");
String graphic_name = jobject.getString("question_image");
String optionA = jobject.getString("optiona");
String optionB = jobject.getString("optionb");
String optionC = jobject.getString("optionc");
String optionD = jobject.getString("optiond");
String questionNo = jobject.getString("question_number");
String question = jobject.getString("question");
questionList.add(new Question(questionNo, graphic_name, question, optionA, optionB, optionC, optionD, ans));
Log.d("DDD" + this.toString(), String.valueOf(questionList.get(i)));
}
Log.i("ONE QUESTION", questionList.get(50).getQuestion());
} catch (Exception e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
return questionList;
}
}
So how can i parse it from firebase because initially, if a student chooses question and year i passes those value as parameter and use them for parsing. but in firebase now i have access to only root firebase name in the get reference e method
To access for example "correct_ans":"A" you would query your firebase like so:
your.firebase.domain/questions/English/English_2002/0/correct_ans
Notice that each level in the json object is represented by a / and the key you want to access whereas in case of an array you simple add the array index. JSON's simple structure also allows simple REST like access
I want to retrieve some data from mysql in php and store it in array and then in Android I want to use that data. For example I want to retrieve the location of multiple people whose profession id = 1 (let's say) and then in Android I want to show that locations on map. I don't know how to do this. I have the following PHP and Android files which don't work. Please help.
<?php
require "config.php";
$pro_id=1;
$sql="SELECT user.first_name, current_location.crtloc_lat,current_location.crtloc_lng FROM user INNER JOIN current_location
where user.user_id=current_location.user_id AND user.pro_id='$pro_id'";
//$sql = "select * from current_location where user_id=76";
$res = mysqli_query($con,$sql);
$result = array();
while($row = mysqli_fetch_array($res)){
array_push($result,
array('lat'=>$row[3],
'lan'=>$row[4]
));
}
echo json_encode(array("result"=>$result));
mysqli_close($con);
and android activity
public void searchProfession(){
JSONObject myJson = null;
try {
// http://androidarabia.net/quran4android/phpserver/connecttoserver.php
// Log.i(getClass().getSimpleName(), "send task - start");
HttpParams httpParams = new BasicHttpParams();
//
HttpParams p = new BasicHttpParams();
// p.setParameter("name", pvo.getName());
// p.setParameter("user", "1");
p.setParameter("profession",SearchProfession);
// Instantiate an HttpClient
HttpClient httpclient = new DefaultHttpClient(p);
String url = "http://abh.netai.net/abhfiles/searchProfession.php";
HttpPost httppost = new HttpPost(url);
// Instantiate a GET HTTP method
try {
Log.i(getClass().getSimpleName(), "send task - start");
//fffffffffffffffffffffffffff
httppost.setHeader("Content-type", "application/json");
InputStream inputStream = null;
String result = null;
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
inputStream = entity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
// BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
myJSON=result;
// return JSON String
if(inputStream != null)inputStream.close();
//ffffffffffffffffffffffffffff
//
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("user", "1"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
ResponseHandler<String> responseHandler = new BasicResponseHandler();
String responseBody = httpclient.execute(httppost,
responseHandler);
// Parse
JSONObject json = new JSONObject(myJSON);
JSONArray jArray = json.getJSONArray("result");
ArrayList<HashMap<String, String>> mylist =
new ArrayList<HashMap<String, String>>();
for (int i = 0; i < jArray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = jArray.getJSONObject(i);
String lat = e.getString("lat");
String lan = e.getString("lan");
map.put("lat",lat);
map.put("lan",lan);
mylist.add(map);
Toast.makeText(MapsActivity.this, "your location is"+lat+","+lan, Toast.LENGTH_SHORT).show();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Log.i(getClass().getSimpleName(), "send task - end");
} catch (Throwable t) {
Toast.makeText(this, "Request failed: " + t.toString(),
Toast.LENGTH_LONG).show();
}
Dear imdad: The Problem lies in you json file.
{"[]":{"user_id":"77","crtloc_lat":"34.769638","crtloc_lng":"72.361145"}, {"user_id":"76","crtloc_lat":"34.769604","crtloc_lng":"72.361092"},{"user_id":"87","crtloc_lat":"33.697117","crtloc_lng":"72.976631"}}
The Object is empty give it some name like here is response. Change it as:
{"response":[{"user_id":"77","crtloc_lat":"34.769638","crtloc_lng":"72.361145"},{"user_id":"76","crtloc_lat":"34.769604","crtloc_lng":"72.361092"},{"user_id":"87","crtloc_lat":"33.697117","crtloc_lng":"72.976631"}]}