This Java tip illustrates a method of getting the client’s address in a Servlet. In an embodiment developer may use this tip in their client server applications for knowing at the server end the address of the client which made the request.

// This method is called by the servlet container to process a GET request.
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {

// Get client's IP address
String addr = req.getRemoteAddr(); // 123.123.123.123

// Get client's hostname
String host = req.getRemoteHost(); // hostname.com
}