makeJava HttpPost command and print length of content

gistfile1.txt

HttpClient httpclient = HttpClients.createDefault();
    HttpPost httpPost = new HttpPost("http://httpbin.org/post");
    List<NameValuePair> params = new ArrayList<>(2);
    params.add(new BasicNameValuePair("param-1", "12345"));
    params.add(new BasicNameValuePair("param-2", "Hello2!"));
    params.add(new BasicNameValuePair("param-3", "Hello3!"));
    params.add(new BasicNameValuePair("param-4", "Hello4!"));
    httpPost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
    HttpResponse response = httpclient.execute(httpPost);
    HttpEntity entity = response.getEntity();
    System.out.println("length: " + entity.getContentLength());
    String inputLine;
    BufferedReader br = new BufferedReader(new InputStreamReader(entity.getContent()));
    try {
      while ((inputLine = br.readLine()) != null) {
        System.out.println(inputLine);
      }
      br.close();
    } catch (IOException e) {
      e.printStackTrace();
    }