Return different GWT imlementation to Mobile and Desktop clients on GAE

问题

I'm using different implementations for Desktop and Mobile clients in my GWT application (which runs from GAE). One solution is the user-agent detection in GWT. This solutions loads both the Desktop and Mobile implementation into the client.

A cleaner solution would be an user-agent detection on the server servlet. This solution only returns the correct implementation for the client.

How do I return this different implementations from GAE?

回答1:

I've actually done that. You declare your welcome page as an url that is mapped to as servlet

<welcome-file-list>
        <welcome-file>/urlToSomeServlet</welcome-file>
    </welcome-file-list>

In this servlet you get the userAgent value:

String userAgent = request.getHeader("User-Agent");

And then, depending on that value, you can either forward or redirect to your desktop page or to your mobile page:

request.getRequestDispatcher("desireedHtmlPage.html").forward(request,response);

response.sendRedirect("desireedHtmlPage.html");

Forward will make the browser think that he's still at the initial request and it will still display the welcome page url, while doing a redirect will actually tell the browser that he's being redirected to another resource, so that resource's url will be displayed in the navigation bar.

回答2:

Have you looked at the MobileWebApp sample from GWT?

回答3:

There's also a good example here GWT 2.1 Seminar 2010. This uses server side user-agent checking dropping back to query parameters (m=1). It does this in the applications gwt.xml file.

来源：https://stackoverflow.com/questions/7793883/return-different-gwt-imlementation-to-mobile-and-desktop-clients-on-gae

标签

java

google-app-engine

gwt