Как отправить POST-запрос в Java?

 String data = URLEncoder.encode("mydata", "UTF-8") + "=" + URLEncoder.encode("mydatavalue", "UTF-8");
data += "&" + URLEncoder.encode("mydata2", "UTF-8") + "=" + URLEncoder.encode("mydatavalue2", "UTF-8");
    try {        
         // Send the request
     URL url = new URL("http://example.com");
         URLConnection conn = url.openConnection();
         conn.setDoOutput(true);
         OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
         //write parameters
         writer.write(data);
         writer.flush();
         // Get the response
         StringBuffer answer = new StringBuffer();
         BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
         String line;
         while ((line = reader.readLine()) != null) {
             answer.append(line);
         }
         writer.close();
         reader.close();
    }
    catch (Exception e) {
        //handle exception
    }