How to send requestparameter in POST request using HttpUrlConnection

Question

I need to send a POST request to a URL and send some request parameters. I am using HttpURLConnectionAPI for this. But my problem is I do not get any request parameter in the servlet. Although I see that the params are present in the request body, when I print the request body using request.getReader. Following is the client side code. Can any body please specify if this is correct way to send request parameters in POST request?

String urlstr = "http://serverAddress/webappname/TestServlet";

String params = "&paramname=paramvalue";

URL url = new URL(urlstr);

HttpURLConnection urlconn = (HttpURLConnection) url.openConnection();

urlconn.setDoInput(true);

urlconn.setDoOutput(true);

urlconn.setRequestMethod("POST");

urlconn.setRequestProperty("Content-Type", "text/xml");

urlconn.setRequestProperty("Content-Length", String.valueOf(params.getBytes().length));

urlconn.setRequestProperty("Content-Language", "en-US");

OutputStream os = urlconn.getOutputStream();

BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));

writer.write(params);

writer.close();

os.close();

Not sure if you need that leading & in your params string. Also, you should writer.write(params.getBytes()) — Kal
– Kal, Commented May 2, 2011 at 16:40

muruga · Accepted Answer · 2012-11-14 22:03:07Z

2

To be cleaner, you can encode to send the values.

String data = URLEncoder.encode("key1", "UTF-8") + "=" + URLEncoder.encode("value1", "UTF-8");
data += "&" + URLEncoder.encode("key2", "UTF-8") + "=" + URLEncoder.encode("value2", "UTF-8");

URL url = new URL("http://yourserver.com/whatever");
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data);

answered Nov 14, 2012 at 22:03

muruga

1,0738 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Ram kiran Pachigolla · Accepted Answer · 2013-02-21 05:31:12Z

0

Like @Kal said, get rid of the leading & and don't bother with the BufferedWriter. This works for me:

byte[] bytes = parameters.getBytes("UTF-8");
httpUrlConnection.setRequestProperty("Content-Length", String.valueOf(bytes.length));
httpUrlConnection.setRequestMethod("POST");
httpUrlConnection.setDoOutput(true);
httpUrlConnection.connect();
outputStream = httpUrlConnection.getOutputStream();
outputStream.write(bytes);

edited Feb 21, 2013 at 5:31

Ram kiran Pachigolla

21.3k15 gold badges60 silver badges78 bronze badges

answered May 2, 2011 at 17:02

Femi

64.8k8 gold badges120 silver badges150 bronze badges

Collectives™ on Stack Overflow

How to send requestparameter in POST request using HttpUrlConnection

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related