GAE上的Mobile和Desktop客户端返回不同的GWT插件 [英] Return different GWT imlementation to Mobile and Desktop clients on GAE

问题描述

我在我的GWT应用程序（从GAE运行）中为桌面和移动客户端使用不同的实现。一种解决方案是GWT中的用户代理检测。这个解决方案将Desktop和Mobile实现加载到客户端中。

更清晰的解决方案是在服务器servlet上进行用户代理检测。此解决方案仅返回客户端的正确实施。

如何从GAE返回这个不同的实现？

我已经做到了。您将欢迎页面声明为映射为servlet的url

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

在这个servlet中，你得到了userAgent的值：

 字符串userAgent = request.getHeader（User-Agent）; 
  

然后，根据该值，您可以转发或重定向到您的桌面页面或您的移动页面：

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

或

  response.sendRedirect是（ desireedHtmlPage.html）; 
  

转发会使浏览器认为他仍处于初始请求状态，并且仍会显示欢迎页面网址，而做重定向会实际上告诉浏览器他被重定向到另一个资源，所以资源的URL将显示在导航栏中。

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?

解决方案

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);

or

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.

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