@@ -16,8 +16,12 @@ public static void main(String[] args) throws IOException {
1616 //creating a url, the url link denotes a php file that has some string value to be returned to this program when invoked
1717 URL url = new URL ("http://adhikariaashish.com.np/Java_Network_Connection_demo.php" );
1818
19- //connecting to a url
20- HttpURLConnection httpURLConnection = (HttpURLConnection ) url .openConnection ();
19+ 20+ //If you call method openConnection() for a URL it returns an URLConnection object.
21+ URLConnection urlConnection = url .openConnection ();
22+ 23+ //Since we are using a url whose protocol is HTTP, we need to typecast this connection to HttpURLConnection first before operating
24+ HttpURLConnection httpURLConnection = (HttpURLConnection ) urlConnection ;
2125
2226 //Set the method for the URL request, one of: GET POST HEAD OPTIONS PUT DELETE TRACE are legal
2327 httpURLConnection .setRequestMethod ("POST" );
@@ -31,6 +35,8 @@ public static void main(String[] args) throws IOException {
3135 //getOutputStrream() returns the output stream of the URL connection for writing to the resource
3236 OutputStream outputStream = httpURLConnection .getOutputStream ();
3337 BufferedWriter bufferedWriter = new BufferedWriter (new OutputStreamWriter (outputStream , "UTF-8" ));
38+ 39+ //the string "Java_Program_Demo" is checked by the php file to decide whether to return the string value to this java program or not
3440 String post_data = URLEncoder .encode ("type" , "UTF-8" ) + "=" + URLEncoder .encode ("Java_Program_Demo" , "UTF-8" );
3541 bufferedWriter .write (post_data );
3642 bufferedWriter .flush ();
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