如何从ExternalContext获取webapp的绝对URL？

Question

我正在尝试从ExternalContext检索Web应用程序的根URL，但无法理解使用哪种方法...

Answer 1

A more concise way is:

HttpServletRequest request = (HttpServletRequest) externalContext.getRequest();
String url = request.getRequestURL().toString();
String baseURL = url.substring(0, url.length() - request.getRequestURI().length()) + request.getContextPath() + "/";

Then you don't need to fiddle with omitting the ports when the scheme is http and port is 80 and so on.

Answer 2

You can get ExternalContext from FacesContext and extract request from External context then

String file = request.getRequestURI();
if (request.getQueryString() != null) {
   file += '?' + request.getQueryString();
}
URL reconstructedURL = new URL(request.getScheme(),
                               request.getServerName(),
                               request.getServerPort(),
                               file);
reconstructedURL.toString();

source

Answer 3

This is the easiest way I've found that doesn't involve mysterious string manipulation on the various parts of the URL. It seems to work in all cases, including different protocols and ports.

String getAbsoluteApplicationUrl() throws URISyntaxException {
        ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
        HttpServletRequest request = (HttpServletRequest) externalContext.getRequest();
        URI uri = new URI(request.getRequestURL().toString());
        newUri = new URI(uri.getScheme(), null,
                uri.getHost(),
                uri.getPort(),
                request.getContextPath().toString(),null, null);
        return newUri.toString();
 }

Answer 4

I have one similar to BalusC's:

FacesContext context = FacesContext.getCurrentInstance();
HttpServletRequest request = (HttpServletRequest)context.getExternalContext().getRequest();
String requestURL = request.getRequestURL().toString();
String url = requestURL.substring(0, requestURL.lastIndexOf("/"));

Answer 5

Let me re-phrase Jigar's answer a bit:

final ExternalContext ectx = context.getExternalContext();
String url = ectx.getRequestScheme()
  + "://" + ectx.getRequestServerName()
  + ":" + ectx.getRequestServerPort()
  + "/" + ectx.getRequestContextPath();