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Here's the scenario.
My Java web application has following path
https://www.mywebsite.com:9443/MyWebApp Let's say there is a JSP file
https://www.mywebsite.com:9443/MyWebApp/protected/index.jsp and I need to retrieve
https://www.mywebsite.com:9443/MyWebApp within this JSP file.
Of course, there is rather a lazy and silly way of just getting the URL and then re-tracing the path back.
But is there a programatic way of doing this? Specifically, I think I can get the domain + port, but how do I actually retrieve the application name "MyWebApp"?
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Firstly, we'd need to extract the host from the given URL value. We can use the URI class: String urlString = "https://www.baeldung.com/java-tutorial"; URI uri = new URI(urlString); String host = uri. getHost();
To access the domain name from an above URL, we can use the window. location object that contains a hostname property which is holding the domain name. Similarly, we can also use the document. domain property to access it.
Take a look at the documentation for HttpServletRequest.
In order to build the URL in your example you will need to use:
getScheme()getServerName()getServerPort()getContextPath()Here is a method that will return your example:
public static String getURLWithContextPath(HttpServletRequest request) { return request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath(); } The web application name (actually the context path) is available by calling HttpServletrequest#getContextPath() (and thus NOT getServletPath() as one suggested before). You can retrieve this in JSP by ${pageContext.request.contextPath}.
<p>The context path is: ${pageContext.request.contextPath}.</p> If you intend to use this for all relative paths in your JSP page (which would make this question more sense), then you can make use of the HTML <base> tag:
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> <c:set var="req" value="${pageContext.request}" /> <c:set var="url">${req.requestURL}</c:set> <c:set var="uri" value="${req.requestURI}" /> <!doctype html> <html lang="en"> <head> <title>SO question 2204870</title> <base href="${fn:substring(url, 0, fn:length(url) - fn:length(uri))}${req.contextPath}/"> <script src="js/global.js"></script> <link rel="stylesheet" href="css/global.css"> </head> <body> <ul> <li><a href="home.jsp">Home</a></li> <li><a href="faq.jsp">FAQ</a></li> <li><a href="contact.jsp">Contact</a></li> </ul> </body> </html> All links in the page will then automagically be relative to the <base> so that you don't need to copypaste the context path everywhere. Note that when relative links start with a /, then they will not be relative to the <base> anymore, but to the domain root instead.
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