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marți, 16 iunie 2015

[OmniFaces utilities 2.0] Get the HTTP request base URL


[OmniFaces utilities] The getRequestBaseURL() method returns the HTTP request base URL. This is the URL from the scheme, domain until with context path, including the trailing slash. This is the value you could use in HTML <base> tag.

Method:
Usage:


·         inside a servlet filter or even a plain vanilla servlet (basically, when FacesContext is not available):

import org.omnifaces.util.Servlets;
...
@WebServlet("/MyServlet")
public class MyServlet extends HttpServlet {
 protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // e.g. http://localhost:8080/MyApp/
  String baseURL = Servlets.getRequestBaseURL(request);
 }
 ...
}

·         in JSF, when FacesContext is available use, Faces#getRequestBaseURL(), or more clumsy (not recommended):

import org.omnifaces.util.Servlets;
...
// or simply use, Faces#getRequest()
FacesContext context = FacesContext.getCurrentInstance();
ExternalContext externalContext = context.getExternalContext();
HttpServletRequest request = (HttpServletRequest) externalContext.getRequest();

// e.g. http://localhost:8080/MyApp/
String baseURL = Servlets.getRequestBaseURL(request);

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