Can I log in a site only with HttpUrlConnection?

Question

I'm trying to write a small program which help me to log into my Megaupload account and manage my own stuffs there. But I met a obstacle right from the start, login site.
After reading some of Sun's ["working with URLs" lesson|http://java.sun.com/docs/books/tutorial/networking/urls/index.html] and searching around, I've tried coding a small method to do this step. As the following:
try{
       URL mega = new URL("http://megaupload.com/?c=login");
       String data = URLEncoder.encode("login=1&
                                                        redir=1&
                                                        username=my_username&
                                                         password=my_password","UTF-8");
        HttpURLConnection connection = (HttpURLConnection)mega.openConnection();
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Host", "megaupload.com");
     connection.setRequestProperty("Cookie", cookie);
     connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 ( .NET CLR 3.5.30729)");
     connection.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
        connection.setRequestProperty("Accept-Language", "en-us, en;q=0.5");
     connection.setRequestProperty("Accept-Encoding", "gzip,deflate");
     connection.setRequestProperty("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
     connection.setRequestProperty("Keep-Alive", "115");
        connection.setRequestProperty("Connection", "keep-alive");
     connection.setRequestProperty("Referer", "http://megaupload.com/?c=login");
     connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
     connection.setReadTimeout(10000);
     connection.setRequestProperty("Content-Length", Integer.toString(data.getBytes().length));
     connection.setDoInput(true);
     connection.setDoOutput(true);
        DataOutputStream wr = new DataOutputStream(connection.getOutputStream());
     wr.writeBytes(data);
     wr.flush();
     wr.close();
       //Codes to reading the response from MU
}catch(Exception e){
}The headers i receipt was exactly the same as using Firefox, but the html body was always of the login site instead of redirecting to the home page with logged in status. After some failed attempts to solve it myself, I came up searching help from this forum, and realized that there's lots of problem similar to mine. However, not any of them is absolutely solved without using external libraries (HttpsClient). I wonder if I can do it only with existing internal libraries. If yes, what I need to do?
Thanks in advanced for help, and sorry for my bad English.

Answer 1

I modified it:
String data  = URLEncoder.encode("login", "UTF-8") + "=" + URLEncoder.encode("1", "UTF-8");
data  += "&" + URLEncoder.encode("redir", "UTF-8") + "=" + URLEncoder.encode("1", "UTF-8");
data  += "&" + URLEncoder.encode("username", "UTF-8") + "=" + URLEncoder.encode("chihuongbk", "UTF-8");
data  += "&" + URLEncoder.encode("password", "UTF-8") + "=" + URLEncoder.encode("19881026h", "UTF-8");
..........Got the same result. I think that's not the problem. I feel there is something missing. Can you tell me whether I can log in the site this way with some more modifications !??