问题
is there any equivalent to FacesContext, but in servlet environment?
I have some DAOSessionManager that handles transaction to my database. I can use the FacesContext to identify the current http request when the current page is written using JSF, but what about servlet ones ?
I can't find any way to get the current Servlet context, or httpRequest...
Thanks.
PS : yes, having a reference to FacesContext from my DAO layer is a shame, but that's a start.
回答1:
It's the ServletContext. It's available inside servlet classes by the inherited getServletContext() method.
protected void doGet(HttpServletRequest request, HttpServletResponse response) {
ServletContext context = getServletContext();
// ...
}
The major difference with FacesContext
is that the ServletContext
isn't ThreadLocal, so you cannot obtain it "statically" from the current thread like FacesContext#getCurrentInstance() does. You really need to pass the ServletContext
reference around into the DAO methods wherever you need it:
someDAO.doSomething(getServletContext());
Or better yet, to avoid tight coupling, just extract the desired information from it and pass it:
Object interestingData = getServletContext().getAttribute("interestingData");
someDAO.doSomething(interestingData);
回答2:
ServletContext servletContext = (ServletContext)FacesContext.getCurrentInstance().getExternalContext().getContext();
来源:https://stackoverflow.com/questions/3754327/facescontext-and-servlet-context