how to get the base url from jsp request object?

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How to get the base url from the jsp request object? http://localhost:8080/SOMETHING/index.jsp, but I want the part till index.jsp, how is it possible in jsp?

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6条回答

一整个雨季

2020-11-30 07:48
There is one major flaw in @BalusC accepted answer though. Substring should start from 0 and not 1. Instead of
```
<base href="${fn:replace(req.requestURL, fn:substring(uri, 1, fn:length(uri)), req.contextPath)}" />
```
it should be
```
<base href="${fn:replace(req.requestURL, fn:substring(uri, 0, fn:length(uri)), req.contextPath)}" />
```
With 1 you get double forward slash: http://localhost:8080//appcontext/ With 0 you get, http://localhost:21080/appcontext/

In my application, request.getSession(false) always returned null when it was ending in double slash!!!
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一整个雨季

2020-11-30 07:52

just use isSecure()

{<%=request.isSecure()?"https":"http:"%>}

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攒了一身酷

2020-11-30 08:00

JSP variant of Bozho's answer:

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:set var="req" value="${pageContext.request}" />
<c:set var="baseURL" value="${req.scheme}://${req.serverName}:${req.serverPort}${req.contextPath}" />

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被撕碎了的回忆

2020-11-30 08:03
Instead of doing all of that, just do this:
```
request.getServerName().toString()
```
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名媛妹妹

2020-11-30 08:04

new URL(request.getScheme(), 
        request.getServerName(), 
        request.getServerPort(), 
        request.getContextPath());

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遥遥无期

2020-11-30 08:07

So, you want the base URL? You can get it in a servlet as follows:

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

Or in a JSP, as <base>, with little help of JSTL:

<%@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="${req.requestURI}" />
...
<head>
    <base href="${fn:substring(url, 0, fn:length(url) - fn:length(uri))}${req.contextPath}/" />
</head>

Note that this does not include the port number when it's already the default port number, such as 80. The java.net.URL doesn't take this into account.

how to get the base url from jsp request object?

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