Java Post request with form data

I want to make a simple POST call in Java,
I am getting a 200 response code but, with the wrong response message,
I am told there is a different way to make a Post call when using a form data.

Following is my current Java code to make the post call -

private String makePostCall() < try < String url = "http://someIp/trusted"; HttpClient client = new DefaultHttpClient(); HttpPost post = new HttpPost(url); // add header ListurlParameters = new ArrayList(); urlParameters.add(new BasicNameValuePair("username", "app_user")); post.setEntity(new UrlEncodedFormEntity(urlParameters)); HttpResponse response = client.execute(post); System.out.println("\nSending 'POST' request to URL : " + url); System.out.println("Post parameters : " + post.getEntity()); System.out.println("Response Code : " + response.getStatusLine().getStatusCode()); BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); StringBuffer result = new StringBuffer(); String line = ""; while ((line = rd.readLine()) != null) < result.append(line); >System.out.println(result.toString()); return result.toString(); > catch (Exception e) < e.printStackTrace(); return null; >> 

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Following is the Post call sample that is working through Postman app - I am referring the following website -
https://www.mkyong.com/java/how-to-send-http-request-getpost-in-java/
The expected outcome of the post call is supposed to be a Token ie. a String value, current response is -1.