Create URL using <c:url> tag of JSTL
Core tag library
Here in this example we are going to create a url
according to the user's given parameter by using <c:url> tag.
| <C:url>
: This is a member of JSTL core tag library and used to create url
with some optional parameters. |
Attributes of
the tag <c:url>
| var |
Declare a scoped variable
that stores the url. |
| scope |
Define the scope for
declared variable like page or request or session or application. |
| value |
Value attribute define a
String that is used to specify a url that will process as url later. |
| context |
We can provide context
name as attribute that is prepended with the url. For this url
and
context must start with forward slash. If url is not started
with forward slash, it is assumed
to be a relative url, in this situation context name is
unnecessary. |
|
We have also used tag <c:param> to add parameters
to the specified url. Attribute of this tag are name
that is used to provide a name to parameter and value
is
used to initialize parameter of this name.
In the code given below, first we will create a web
page having three text fields for name, age and sex. When user enters all these
information and click on submit button then <c:url> tag calculate the url
with the given paramaters and show the calculated url in the same web
page.
createUrl.jsp
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c"%>
<c:url value="displayValues.jsp" var="displayURL">
<c:param name="name" value="${param.name}" />
<c:param name="age" value="${param.age}" />
<c:param name="gender" value="${param.gender}" />
</c:url>
<html>
<head>
<title>c:url CoreJstl Tag</title>
</head>
<body>
<font size="4" color="green">This page takes 3 values that user entered
in the text box given <br>
below and when click on submit button shows url with given parameters.</font>
<form method="post">
<table>
<tr>
<td>Enter name:</td>
<td><input type="text" name="name" /></td>
</tr>
<tr>
<td>Enter age:</td>
<td><input type="text" name="age" /></td>
</tr>
<tr>
<td>Enter gender:</td>
<td><input type="text" name="gender" /></td>
</tr>
</table>
<input type="submit" value="submit" /></form>
<c:if test="${pageContext.request.method=='POST'}">
Here application receives the values that you have submitted,
<br>and creates a URL that contains
these values.
<p /><strong>URL is </strong><font size="3" color="red"><c:out
value="${displayURL}" /></font>
</c:if>
</body>
</html>
|
Steps to run this example :
1: Download the zip file of code and unzip this
file, you will get a folder named 'catch_exception_jstlCoreTag'.
2: Paste this folder in 'Apache Tomcat 6.0.16-->webapps' or generally
in directory 'C:\apache-tomcat-6.0.16\webapps'.
3: Start tomcat server by click on startup.bat file in
'C:\apache-tomcat-6.0.16\bin'.
4: Open browser and type url 'http://localhost:8080/create_url_jstlCore/createUrl.jsp'
or click on this link.
Output of the program
When user clicks on submit button, response will be...
Download Source Code
|
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