HttpURLConnection Post Android

Question

I am trying to use the tutorial here with the data I learned here to perform a HTTPUrlConnection POST Request. Every time I run it, the response gives the error message: "You Must enter a user name!" and "You must enter a password." Could anyone please explain why the server is not recognizing or even getting the posted data? Here is my code:

class urlRequest extends AsyncTask<String, String, String> {

protected String doInBackground(String... all) {
            URL url;
            String response = "";
            try {
                String requestURL = "https://hac.chicousd.org/LoginParent.aspx?page=GradebookSummary.aspx";
                url = new URL(requestURL);

                HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
                conn.setReadTimeout(15000);
                conn.setConnectTimeout(15000);
                conn.setRequestMethod("POST");
                conn.setDoInput(true);
                conn.setDoOutput(true);
                conn.setRequestProperty( "Content-Type", "application/x-www-form-urlencoded");
                conn.setRequestProperty( "charset", "utf-8");
                conn.setRequestProperty( "Content-Length", Integer.toString(getPostDataString(postDataParams).length()));
                conn.setFixedLengthStreamingMode(getPostDataString(postDataParams).length());


                JSONObject postDataParams = new JSONObject();
                postDataParams.put("checkCookiesEnabled", "true");
                postDataParams.put("checkMobileDevice", "false");
                postDataParams.put("checkStandaloneMode", "false");
                postDataParams.put("checkTabletDevice", "false");
                postDataParams.put("portalAccountUsername", "username");
                postDataParams.put("portalAccountPassword", "password");

                DataOutputStream os = new DataOutputStream(conn.getOutputStream());
                BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));

                writer.write(getPostDataString(postDataParams)); // returns: checkCookiesEnabled=true&checkMobileDevice=false&checkStandaloneMode=false&checkTabletDevice=false&portalAccountUsername=username&portalAccountPassword=password

                writer.close();
                os.close();

                int responseCode=conn.getResponseCode();

                if (responseCode == HttpsURLConnection.HTTP_OK) {
                    String line;
                    BufferedReader br=new BufferedReader(new InputStreamReader(conn.getInputStream()));
                    while ((line=br.readLine()) != null) {
                        response+=line;
                        Log.i("tag", line);
                    }
                }
                else {
                    response="";
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
    return response;
           }

public String getPostDataString(JSONObject params) throws Exception {

    StringBuilder result = new StringBuilder();
    boolean first = true;

    Iterator<String> itr = params.keys();

    while(itr.hasNext()){

        String key= itr.next();
        Object value = params.get(key);

        if (first)
            first = false;
        else
            result.append("&");

        result.append(URLEncoder.encode(key, "UTF-8"));
        result.append("=");
        result.append(URLEncoder.encode(value.toString(), "UTF-8"));

    }
    return result.toString();
}

Check if your `getPostDataString()` returns the exact string that the server expects. — Akshay Bhat 'AB', Jan 02 '17 at 05:04
How am I supposed to know what the server expects? PS I edited and added what getPostDataString returns. — Jacolack, Jan 02 '17 at 06:25
Why are you using `getPostDataString(postDataParams)`? Perhaps try `postDataParams.toString()` instead. — Marc Bacvanski, Jan 02 '17 at 06:25
@mbacvanski postDataParams.toString() returns a value in brackets with colons, which is not utf8 encoded — Jacolack, Jan 02 '17 at 06:27
@jacolack I think you need to use `HttpsUrlConnection` since the connection is through HTTPS — Marc Bacvanski, Jan 02 '17 at 06:37
Try adding these: `conn.setRequestProperty( "Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty( "charset", "utf-8"); conn.setRequestProperty( "Content-Length", Integer.toString( postDataParams.toString().length)); ` — Marc Bacvanski, Jan 02 '17 at 06:44
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/132060/discussion-between-jacolack-and-mbacvanski). — Jacolack, Jan 02 '17 at 06:49

score 0 · Answer 1 · answered Jan 02 '17 at 05:07

0

Posting parameters Using POST:-

URL url;
URLConnection urlConn;
DataOutputStream printout;
DataInputStream  input;
url = new URL (getCodeBase().toString() + "env.tcgi");
urlConn = url.openConnection();
urlConn.setDoInput (true);
urlConn.setDoOutput (true);
urlConn.setUseCaches (false);
urlConn.setRequestProperty("Content-Type","application/json");   
urlConn.setRequestProperty("Host", "android.schoolportal.gr");
urlConn.connect();  
//Create JSONObject here
JSONObject jsonParam = new JSONObject();
jsonParam.put("portalAccountUsername", "username");
jsonParam.put("portalAccountPassword", "password");

The part which you missed is in the the following... i.e., as follows..

// Send POST output.
printout = new DataOutputStream(urlConn.getOutputStream ());
printout.writeBytes(URLEncoder.encode(jsonParam.toString(),"UTF-8"));
printout.flush ();
printout.close ();

answered Jan 02 '17 at 05:07

siddhesh

563
1
9
15

I changed the writer.write to printout.writeBytes like you showed, and no change. But then I added the urlConn.setRequestProperty("Host", "android.schoolportal.gr"); and no response was printed. Explanation? – Jacolack Jan 02 '17 at 06:09
and could you explain: (getCodeBase().toString() + "env.tcgi") and "android.schoolportal.gr" – Jacolack Jan 02 '17 at 06:12
the url part and host part dont use it i have use it for my purpose . I had just copied my code block and posted it here just ignore that part – siddhesh Jan 02 '17 at 06:14
ok than the main part of your answer (printout part) does not work... it seems like every attempt at writing the post doesn't get through and it just receives the response as if it never posted anything at all (lacking username and password) any idea on ensuring the JSON data is sent with the request? – Jacolack Jan 02 '17 at 06:18

score 0 · Answer 2 · answered Jan 02 '17 at 05:49

0

u are got message from validation so please check username and password not null or blank before use it.

answered Jan 02 '17 at 05:49

Anil Kanani

260
2
19

I am getting full HTML response of the absence of a username and password – Jacolack Jan 02 '17 at 06:00

HttpURLConnection Post Android

2 Answers2