How to set class="active" to the active page

I'm designing an application in which I'm using jsp pages. Now I need something that indicates which is the current 开发者_开发技巧page that is being displayed. Basically, I want a menu that has for every page, on which I place class=”active” on the current page.

How do I do this? Any suggestions? Thanks!

---

Kickoff example:

<c:set var="currentPage" value="${fn:substring(pageContext.request.servletPath, 1, -1)}" />
<ul>
    <c:forEach items="${bean.menu}" var="item">
        <li><a href="${item.link}"${item.link == currentPage ? ' class="active"' : ''}>${item.name}</li>
    </c:forEach>
</ul>

This assumes ${bean.menu} to be a List<Menu>, the Menu to be a bean with properties link and name and the ${item.link} to return pathnames like home.jsp, contact.jsp (or if you're using a controller servlet, home, contact, etc).

The fn:substring() gets rid of the leading slash. The conditional operator ?: in EL only prints the class when the condition is true, else nothing.

---

You should get the current URL

<% String URL = request.getRequestURL(); %>

Then in the menu you could set the class="active" on an element if the current URL (or, retrieving the 'current page' from the url) match the menu element (by title, id...) you want to be "active"