HTTP POST in Java using URLConnection

    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.OutputStreamWriter;
    import java.io.UnsupportedEncodingException;
    import java.net.MalformedURLException;
    import java.net.URL;
    import java.net.URLConnection;
    import java.net.URLEncoder;


    /**
     *
     * @author dhanoopbhaskar
     */
    public class URLPost {


        public URLPost() {
        }
        
        /**
         * @param args the command line arguments
         */
        public static void main(String[] args) {
            try {
                /**
                 * Constructing the data to be sent.
                 * The data is encoded in UTF8 encoding scheme.
                 * For that encode() method in the class java.net.URLEncoder 
                 * is used
                 */
                String data = URLEncoder.encode("sName", "UTF-8") + "=" + 
                        URLEncoder.encode("PI", "UTF-8");
                data += "&" + URLEncoder.encode("sData", "UTF-8") + "=" + 
                        URLEncoder.encode("3.14159", "UTF-8");
                System.out.println("Data: " + data);
                /**
                 * URL to which the post data has to be sent.
                 */
                URL url = new URL("http://localhost/cybman/test/post2.php");
                /**
                 * A URLConnection is opened
                 */
                URLConnection conn = url.openConnection();
                /**
                 * The variable doOutput in URLConnection is false by default.
                 * It should be set as true, otherwise we cannot write to a
                 * URLConnection.
                 * 
                 * Possible Exception (if doOuput is false):
                 * java.net.ProtocolException: cannot write to a URLConnection 
                 * if doOutput=false - call setDoOutput(true)
                 * at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(
                 *                                      HttpURLConnection.java:885)
                 *              
                 */
                conn.setDoOutput(true);
                /**
                 * Getting the output stream of URLConnection
                 */
                OutputStreamWriter outputStreamWriter = new OutputStreamWriter(
                                                        conn.getOutputStream());
                /**
                 * Writing and flushing the data
                 */
                outputStreamWriter.write(data);
                outputStreamWriter.flush();
                /**
                 * Getting the input stream of URLConnection
                 */
                BufferedReader bufferedReader = new BufferedReader(
                        new InputStreamReader(conn.getInputStream()));
                String line;
                System.out.print("Result: ");
                /**
                 * The Response is read and displayed.
                 */
                while ((line = bufferedReader.readLine()) != null) {
                    System.out.println(line);
                }
                /**
                 * Close the opened readers and writers.
                 */
                outputStreamWriter.close();
                bufferedReader.close();
            } catch (MalformedURLException ex) { //thrown by new URL()
                System.out.println(ex);
            } catch (UnsupportedEncodingException ex) {
                //thrown by URLEncoder.encode()
                System.out.println(ex);
            } catch (IOException ex) { //thrown by stream class methods
                System.out.println(ex);
            } 
        }
    }