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TutorialPoint has a simple example of the c:url tag that looks like this:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title><c:url> Tag Example</title>
</head>
<body>
<a href="<c:url value="/jsp/index.htm"/>">TEST</a>
</body>
</html>
When looking at the corresponding rendering with Chrome's developer tooling it renders like this:
<a href="/jsp/index.htm">TEST</a>
So the c:url tag seems redundant, but I'm sure I'm missing something?
643
Here is a short snippet from my training app where I use <c:url> tag:
<table>
<tr>
<th>First Name</th>
<th>Last Name</th>
<th>Email</th>
<th>Action</th>
</tr>
<c:forEach var="student" items="${student_list}">
<c:url var="loadStudentLink" value="StudentControllerServlet">
<c:param name="command" value="load"/>
<c:param name="id" value="${student.id}"/>
</c:url>
<tr>
<td> ${student.firstName} </td>
<td> ${student.lastName} </td>
<td> ${student.email} </td>
<td>
<a href="${loadStudentLink}">Update</a>
</td>
</tr>
</c:forEach>
</table>
Of course in this case I could just use the link below and it would be the same:
<a href="StudentControllerServlet?command=load&id=${student.id}">Update</a>
In a nutshell, <c:url> creates an ordinary link which you can store in a variable and define its scope.
With <c:param> tags you can set parameters for the link.
In addition, some could say that it looks more neatly with JSTL.
Also, as it was said before, <c:url> already has context path of the app.
So, for instance, you can do this<link rel="stylesheet" href="<c:url value="/resources/css/test.css"/>" />
instead of that<link rel="stylesheet" href="${pageContext.request.contextPath}/resources/css/test.css" />
86
As Tutorials Points says, It is for formatting purposes of the URL you put in and it can be stored in a variable.
Example you have this:
<a href="<c:url value="/test.html"/>">TEST</a>
if you click TEST, it will go to page test.html. simple as that. but the question is, what is the value of <c:url value="/test.html"/> ?
are you thinking the value is only /test.html?
try to test it, like this:
<a href="<c:url value="/test.html" var="testvar" />">TEST</a> // testvar is where you put the url formatted by c:url
<c:out value="${testvar}"/> // you print what is the formatted url
the answer will be the Context Folder of your project plus the URL you put in.
context/test.html will be the output.
I think that its purpose is to have the context (Current Application) already given to the URL, and you only need to add the remaining URL part.
21
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