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How to use relative paths without including the co

2018-12-31 13:57发布

站内文章 / 前沿技术
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问题:

To working my static file (CSS, JS) I have to write absolute path like /AppName/templates/style/main.css. Is there any solution, that I could write relative path like style/main.css?

回答1:

If your actual concern is the dynamicness of the webapp context (the \"AppName\" part), then just retrieve it dynamically by HttpServletRequest#getContextPath().

<head>
    <link rel=\"stylesheet\" href=\"${pageContext.request.contextPath}/templates/style/main.css\" />
    <script src=\"${pageContext.request.contextPath}/templates/js/main.js\"></script>
    <script>var base = \"${pageContext.request.contextPath}\";</script>
</head>
<body>
    <a href=\"${pageContext.request.contextPath}/pages/foo.jsp\">link</a>
</body>

If you want to set a base path for all relative links so that you don\'t need to repeat ${pageContext.request.contextPath} in every relative link, use the <base> tag. Here\'s an example with help of JSTL functions.

<%@ taglib prefix=\"c\" uri=\"http://java.sun.com/jsp/jstl/core\" %>
<%@ taglib prefix=\"fn\" uri=\"http://java.sun.com/jsp/jstl/functions\" %>
...
<head>
    <c:set var=\"url\">${pageContext.request.requestURL}</c:set>
    <base href=\"${fn:substring(url, 0, fn:length(url) - fn:length(pageContext.request.requestURI))}${pageContext.request.contextPath}/\" />
    <link rel=\"stylesheet\" href=\"templates/style/main.css\" />
    <script src=\"templates/js/main.js\"></script>
    <script>var base = document.getElementsByTagName(\"base\")[0].href;</script>
</head>
<body>
    <a href=\"pages/foo.jsp\">link</a>
</body>

This way every relative link (i.e. not starting with / or a scheme) will become relative to the <base>.

This is by the way not specifically related to Tomcat in any way. It\'s just related to HTTP/HTML basics. You would have the same problem in every other webserver.

See also:

  • Browser can't access/find relative resources like CSS, images and links when calling a Servlet which forwards to a JSP
  • Is it recommended to use the <base> html tag?


标签： jsp servlets resources relative-path contextpath
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