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How to call field of json in javafx/java

Currently I can call jsonplaceholder/albums API
using this code
public class Main extends Application {
private static HttpURLConnection connection;
#Override
public void start(Stage primaryStage) throws Exception{
BufferedReader reader;
String line;
StringBuffer responseContent = new StringBuffer();
try {
URL url = new URL("https://jsonplaceholder.typicode.com/albums");
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
int status = connection.getResponseCode();
if (status > 299){
reader = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
} else {
reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
}
while((line = reader.readLine()) != null){
responseContent.append(line);
}
reader.close();
System.out.println(responseContent);
}
catch (MalformedURLException e){
e.printStackTrace();
}
catch (IOException e){
e.printStackTrace();
} finally{
connection.disconnect();
}
}
and this is the output
I can easily call the api. But the problem is how can I map each fields from this array?
In my code, I'm using responseContent to get json data.
I tried System.out.println(responseContent[2]); just to print only the title but It keeps giving me red line.

responseContent is of type StringBuffer, this is just a utility for building Strings, that is arrays of characters. What you require is a JSON parser to provide an API to access the JSON string, e.g. to access the 2nd element in the array.
There are many libraries available, including Jackson, Gson, JSON simple, JSON-b etc.

Restlet Filter Post request

I would like to filter a Post request in Filter (prior it getting to the Resource).
To filter the request I want to retrieve a token from the bode request and do some testing on it.
Current Resource:
#Post
public JsonRepresentation init(JsonRepresentation jRep) {
String token = jRep.getJsonObject().getString("token");
.
.
.
}
Current Filter:
#Override
protected int beforeHandle(Request request, Response response) {
int result = STOP;
String token = (String) Request.getCurrent().getAttributes().get("token");
.
.
.
}
These code does not retrieve the token.
My question is how can I retrieve a body request?

You can directly get the payload text of the request from its associated entity object, as described below:
Representation repr = request.getEntity();
String content = repr.getText();
Hope it helps you,
Thierry

you can try something like this to retreive the body :
public static String getBody(HttpServletRequest request) throws IOException {
String body = null;
StringBuilder stringBuilder = new StringBuilder();
BufferedReader bufferedReader = null;
try {
InputStream inputStream = request.getInputStream();
if (inputStream != null) {
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
char[] charBuffer = new char[128];
int bytesRead = -1;
while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
stringBuilder.append(charBuffer, 0, bytesRead);
}
} else {
stringBuilder.append("");
}
} catch (IOException ex) {
throw ex;
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException ex) {
throw ex;
}
}
}
body = stringBuilder.toString();
return body;
}

As it is dangerous to store request entities directly into memory (imagine if a client send a tera-bytes representation), the framework does not persist representations into memory by default, they can only be read once (from the socket).
I guess the answers to your issue may be read from here: Restlet reuse InputStream

Read utf-8 url to string java

Good day. Have just switched from objective-c to java and trying to read url contents normally to string. Read tons of posts and still it gives garbage.
public class TableMain {
/**
* #param args
*/
#SuppressWarnings("deprecation")
public static void main(String[] args) throws Exception {
URL url = null;
URLConnection urlConn = null;
try {
url = new URL("http://svo.aero/timetable/today/");
} catch (MalformedURLException err) {
err.printStackTrace();
}
try {
urlConn = url.openConnection();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader input = new BufferedReader(new InputStreamReader(
urlConn.getInputStream(), "UTF-8"));
StringBuilder strB = new StringBuilder();
String str;
while (null != (str = input.readLine())) {
strB.append(str).append("\r\n");
System.out.println(str);
}
input.close();
} catch (IOException err) {
err.printStackTrace();
}
}
}
What's wrong? I get something like this
??y??'??)j1???-?q?E?|V??,??< 9??d?Bw(?э?n?v?)i?x?????Z????q?MM3~??????G??љ??l?U3"Y?]????zxxDx????t^???5???j?‌​?k??u?q?j6?^t???????W??????????~?????????o6/?|?8??{???O????0?M>Z{srs??K???XV??4Z‌​??'??n/??^??4????w+?????e???????[?{/??,??WO???????????.?.?x???????^?rax??]?xb??‌​& ??8;?????}???h????H5????v?e?0?????-?????g?vN

Here is a method using HttpClient:
public HttpResponse getResponse(String url) throws IOException {
httpClient.getParams().setParameter("http.protocol.content-charset", "UTF-8");
return httpClient.execute(new HttpGet(url));
}
public String getSource(String url) throws IOException {
StringBuilder sb = new StringBuilder();
HttpResponse response = getResponse(url);
if (response.getEntity() == null) {
throw new IOException("Response entity not set");
}
BufferedReader contentReader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String line = contentReader.readLine();
while ( line != null ){
sb.append(line)
.append(NEW_LINE);
line = contentReader.readLine();
}
return sb.toString();
}
Edit: I edited the response to ensure it uses utf-8.

This is a result of:
You are fetching data that is UTF-8 encoded
You are didn't specify, but I surmise you are printing it to the console on a Windows system
The data is being received and stored correctly, but when you print it the destination is incapable of rendering the Russian text. You will not be able to just "print" the text to stdout unless the ultimate display handler is capable of rendering the characters involved.

Http Post and network delay

I need to make about 15 calls to diferent web services (php) at the application startup.
I'm using the following code for the post
public static String post(String url, List<BasicNameValuePair>
postvalues, HttpClient httpclient) {
try {
if (httpclient == null) {
httpclient = new DefaultHttpClient();
}
HttpPost httppost = new HttpPost(url);
if ((postvalues == null)) {
postvalues = new ArrayList<BasicNameValuePair>();
}
httppost.setEntity(new UrlEncodedFormEntity(postvalues, "UTF-8"));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
return requestToString(response);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
private static String requestToString(HttpResponse response) {
String result = "";
try {
InputStream in = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder str = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
str.append(line + "\n");
}
in.close();
result = str.toString();
} catch (Exception ex) {
result = "Error";
}
return result;
}
The problem is that some of the petitions must be requested in a given order and each request takes about 1-2 second so the "Loading splash" takes about 10 seconds.
So my question is:Since all the connections are to the same server, how can I improve this delay? Is there some way of open a connection and send all the petitions through that "tunnel" reducing the delay?
NOTE: I tested the code and the requests take the same time reusing the httpclient using a new one in each connection
Thanks

What you have in mind is a HTTP persistent connection which reuses the TCP connection.
About this topic there is already a good question & answer here on Stackoverflow:
Persistent HttpURLConnections on Android

Set cookie from HTTP Request

I have get a correct login using HttpRequest to work. It prints the correct html form of the logn page in my toast (just for testing). Now I want to set a cookie from that request. How is this possible?
If it necessary I can provide some code.
I already know about the CookieManager class, but how can I successfully do it?
Thanks in advance!
My code:
public String getPostRequest(String url, String user, String pass) {
HttpClient postClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse response;
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("login", user));
nameValuePairs.add(new BasicNameValuePair("pass", pass));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, HTTP.UTF_8));
response = postClient.execute(httpPost);
if(response.getStatusLine().getStatusCode() == 200) {
HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream instream = entity.getContent();
String result = convertStreamToString(instream);
instream.close();
return result;
}
}
} catch (Exception e) {}
Toast.makeText(getApplicationContext(),
"Connection failed",
Toast.LENGTH_SHORT).show();
return null;
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
Well, this is pretty much it. convertStreamToString() function converts the InputStream into a String (plain HTML code), which I "toast" out to just test it (so it work), so the code is working though. Now to set the cookie. :-)
This is what I've reached for now:
// inside my if (entity != null) statement
List<Cookie> cookies = postClient.getCookieStore().getCookies();
String result = cookies.get(1).toString();
return result;
When I have logged in, the CookieList id 1 contains a value, otherwise the value is standard. So for now I know the difference in value, but how can I continue?

I think Android ships with Apache HttpClient 4.0.
You can check Chapter 3. HTTP state management topic from HttpClient Tutorial.
You can also refer similar questions on SO:
Android project using httpclient --> http.client (apache), post/get method
How do I manage cookies with HttpClient in Android and/or Java?
Also Check this example for usage: http://svn.apache.org/repos/asf/httpcomponents/httpclient/branches/4.0.x/httpclient/src/examples/org/apache/http/examples/client/ClientFormLogin.java