How to write into a file from an applet?

Dear,
I made an applet and I want to create a file in a machine. I tried many way but it not work.
Here is the code:
URL url = "http://hostname/filename.txt;
URLConnection con = url.openConnection();
OutputStream out = con.getOutputStream();
out.write(data);
out.flush();
out.close();
Please help me resolve it.
Thanks.
Khai

URL url = new URL("http://hostname/filename.txt);
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(url.openStream()));
out.write("data");

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