如何获取GWT应用程序的语言环境信息

In GWT I have to specify what locales are supported in my application. The code get compiled in various files, one for each locale (beside other versions), but I have to give my clients one only URL. This URL is supposed to be a page that should be displayed according to the locale preferred by the browser. I dont't want to have an HTTP parameter for the locale since I want to forse the locale preferred by the browser. How can this be coded in GWT?In GWT I have to specify what locales are suppo