Question

To make a poll form using an applet, i wanted to know how can my applet communicate with a servlet . That servlet is meant to write the result to the text file on the server. I have no idea how can i do this.

Answer 1

You could use java.net.URLConnection for this.

Assuming that your servlet is mapped on an URL pattern of /myservlet and your applet is been served from the context root, then this should do:

InputStream servletResponse = new URL(getCodeBase(), "myservlet").openStream();
// ...

That’s all. The getCodeBase() is inherited from Applet class and dynamically returns the applet’s code base URL (from where the applet was been downloaded). The servletResponse will contain whatever you wrote to response.getOutputStream() or response.getWriter() in the servlet. For example just an “ok” string or an easily parseable format like XML or JSON. You could pass request parameters as a query string in the GET request URL, or in the POST request body.

See also:

• Using java.net.URLConnection to fire and handle HTTP requests
• https://stackoverflow.com/questions/9361399/how-to-send-list-of-objects-from-servlet-to-applet