public class Example
{
	public String login() throws Exception
	{
		//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();
		return auth;
	}
	public void download(String auth, String serverPath, String localPath) throws Exception
	{
		//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());
		RandomAccessFile out = new RandomAccessFile(localPath,"rw");
		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();
		out.close();
		urlc.disconnect();
	}
	public void upload(String auth, String serverPath, String localPath) throws Exception
	{
		//upload a file using the auth token, and a PUT.
		URL u = new URL("https://www.crushftp.com"+serverPath);
		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();
		RandomAccessFile in = new RandomAccessFile(localPath,"r");
		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();
		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();
	}
	public void doAction(String auth, String command, String param1, String param2) throws Exception
	{
		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.setDoOutput(true);
		if (command.equalsIgnoreCase("delete")) urlc.getOutputStream().write(("command=delete&names="+param1).getBytes("UTF8"));
		else if (command.equalsIgnoreCase("rename")) urlc.getOutputStream().write(("command=rename&name1="+param1+"&name2="+param2).getBytes("UTF8"));
		else if (command.equalsIgnoreCase("makedir")) urlc.getOutputStream().write(("command=makedir&path="+param1).getBytes("UTF8"));
		else if (command.equalsIgnoreCase("getXMLListing")) urlc.getOutputStream().write(("command=getXMLListing&path="+param1).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.");
		urlc.disconnect();
	}
}