//login and get an auth token
URL u = new URL("https://www.crushftp.com/");
HttpURLConnection urlc = (HttpURLConnection)u.openConnection();
urlc.setRequestMethod("POST");
urlc.setUseCaches(false);
urlc.setDoOutput(true);
urlc.getOutputStream().write(("command=login&username=demo&password=demo").getBytes("UTF8"));
urlc.getResponseCode();
String cookie = urlc.getHeaderField("Set-Cookie");
String auth = cookie.substring(cookie.indexOf("CrushAuth=")+"CrushAuth=".length(),cookie.indexOf(";",cookie.indexOf("CrushAuth=")));
urlc.disconnect();


//download a file using the auth token, and a post.  Alternatively you could also just do a GET on the file.
URL u = new URL("https://www.crushftp.com/");
HttpURLConnection urlc = (HttpURLConnection)u.openConnection();
urlc.setRequestMethod("POST");
urlc.setRequestProperty("Cookie", "CrushAuth="+auth+";");
urlc.setUseCaches(false);
urlc.setDoInput(true);
urlc.setDoOutput(true);
urlc.getOutputStream().write(("command=download&path=/demo/KB2.txt").getBytes("UTF8"));
int code = urlc.getResponseCode();
if (urlc.getURL().toExternalForm().indexOf("/WebInterface/login.html") >= 0) code = 302;
if (code == 302) throw new Exception("Logged out".);
InputStream in = new BufferedInputStream(urlc.getInputStream());
int bytesRead = 0;
byte b[] = new byte[32768];
while (bytesRead >= 0)
{
	bytesRead = in.read(b);
	if (bytesRead >= 0) out.write(b,0,bytesRead);
}
in.close();
urlc.disconnect();


//upload a file using the auth token, and a PUT.
URL u = new URL("https://www.crushftp.com/demo/KB4.txt");
HttpURLConnection urlc = (HttpURLConnection)u.openConnection();
urlc.setRequestMethod("PUT");
urlc.setRequestProperty("Cookie", "CrushAuth="+auth+";");
urlc.setUseCaches(false);
urlc.setChunkedStreamingMode(32768);
urlc.setDoInput(true);
urlc.setDoOutput(true);
OutputStream out = urlc.getOutputStream();
int bytesRead = 0;
byte b[] = new byte[32768];
while (bytesRead >= 0)
{
	bytesRead = in.read(b);
	if (bytesRead >= 0) out.write(b,0,bytesRead);
}
out.close();

int code = urlc.getResponseCode();
if (urlc.getURL().toExternalForm().indexOf("/WebInterface/login.html") >= 0) code = 302;
if (code == 302) throw new Exception("Logged out".);
urlc.disconnect();