POSTing with HttpURLConnection - Logging in

Question

Ok, I'm trying to connect to a webpage and login in using java.
We'll call the website http://www.website.com/
The code on login.php is:
<form action=authenticate.php method=post name=login onsubmit="return saveme();">
Username: <input type=text name=username><br>
Password: <input type=password name=password><br>
Remember me?<br />
<input type="radio" value="ON" name="save">Yes
<input type="radio" name="save" value="OFF" checked>No
<input type=submit value=Submit>
</form>So in my java program I did the following:
HttpURLConnection urlc = (HttpURLConnection) new URL("http://www.website.com/authenticate.php").openConnection();
urlc.setDoInput(true);
urlc.setDoOutput(true);
urlc.setUseCaches(false);
urlc.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
urlc.setRequestProperty("Referer", "http://www.website.com/login.php");
urlc.setRequestProperty("Connection", "Keep-Alive");
urlc.setRequestMethod("POST");
DataOutputStream dos = new DataOutputStream(urlc.getOutputStream());
String content = "username=" + URLEncoder.encode(u, "UTF-8") + "&password=" + URLEncoder.encode(p, "UTF-8") + "&save=ON";
dos.writeBytes(content);
dos.flush();
dos.close();
BufferedReader br = new BufferedReader(new InputStreamReader(urlc.getInputStream()));
String str;
while ((str = br.readLine()) != null)
     System.out.println(str);
try
     br.close();
catch (Exception e)
     e.printStackTrace();
     return false;
}I also have the code for authenticate.php:
<?php
session_start();
if ($_POST['username'] == "" || $_POST['password'] == "")
     die("<h3>Your Game Name Error</h3>
     You did not fill in the login form!<br>
     <a href=login.php>> Back</a>");
//MYSQL stuff
if (mysql_num_rows($uq)==0)
     die("<h3>Your Game Name Error</h3>
     Invalid username or password!<br>
     <a href=login.php>> Back</a>");
else
$_SESSION['loggedin']=1;
$mem=mysql_fetch_array($uq);
$_SESSION['userid']=$mem['userid'];
header("Location: loggedin.php");
?>And one line of code from loggedin.php
if($_SESSION['loggedin']==0) { header("Location: login.php");exit; }I think what might be happening is that it is logging in OK, but when it tries to redirect to loggedin.php, it doesn't realise I'm still logged in. How do I keep me logged in? I know it must have something to do with cookies but I'm not exactly sure what.
Any help would be appreciated, and example code to assist your answer would really help.
Thanks
Krimson Eagl

Answer 1

If your jdk version is 1.6,you can use following code to handler the cookies:
  private static void installCookieHandler(){
        if(CookieHandler.getDefault() ==null){
            CookieHandler handler =new CookieManager(null,CookiePolicy.ACCEPT_ALL);
            CookieHandler.setDefault(handler);
    }make sure this code has run before the HttpURLConnection's;