java servlet : run a method in server when webpage finish onload_问答_开发者

java servlet : run a method in server when webpage finish onload

开发者 https://www.devze.com 2023-03-19 20:26 出处：网络

i want to run a method in servletwhen client finished onload webpage without need to rewrite or reload the current webpage.i try to use javascript onload event, but need to rewrite back the开发者_Pyth

相关专题：servlets

i want to run a method in servlet when client finished onload webpage without need to rewrite or reload the current webpage.i try to use javascript onload event, but need to rewrite back the开发者_Python百科 current page.

how to know a request come from web browser beside using user agent.

I have no idea what you mean with "but need to rewrite back the current page", but to the point, you can just use XMLHttpRequest (Ajax) to send a HTTP request at an arbitrary moment in JavaScript.

Here's a kickoff example which utilizes jQuery so that the crossbrowsercompatible boilerplate Ajax code is minimized by a factor over 10 times, just drop it somewhere in the <head> of your JSP/HTML document:

<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script>
    $(document).ready(function() {
        $.get('servletURL', function() {
            // Write here some callback function if necessary.
        });
    });
</script>

It will invoke the doGet() method of a servlet mapped on /servletURL.

@WebServlet(urlPatterns={"/servletURL"})
public class MyServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // Do your job here.
    }

}

Invoke a javascript function on load and make a ajax call to server

You can use AJAX with jQuery