c:set allows setting the result of an expression in a variable within a given scope. Using this tag helps to set the property of 'JavaBean' and the values of the 'java.util.Map' object.
The JSTL <c:set> tag is similar to the <jsp:setProperty> JSP action tag, but this JSP action tag only allows setting the bean property and cannot set the value of a map key or create a scope variable.
You can perform the following operations using the JSTL <c:set> tag:
- Set JavaBean property.
- Set java.util.Map object value.
- Create a scoped variable on a page, request, session, or application scope.
<c:set> Tag Syntax
Syntax:
<c:set attributes />
<c:set> Tag Attributes
| Attribute | Required | Default | Description |
|---|---|---|---|
| value | No | Body | This attribute is to evaluate an expression and save information. |
| target | No | None | This attribute is used to display the name of an object to save information. |
| property | No | None | This attribute is the property name of the object to set the value specified by the target attribute. |
| var | No | None | The name of the variable to save the information. |
| scope | No | Page | This attribute defines the variable's scope to save the information. Valid values are page, request, session, and application. The following is a detail of the values available in the scope:
|
<c:set> Tag Example
Here is an example where this <c:set> Tag stores information on the session scope:
Example:
<%@ taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "c" %>
<!DOCTYPE html>
<html>
<head>
<title>Example of set in core-JSTL</title>
</head>
<body>
<c:set var = "userid" scope = "session" value="${204}" />
The defined value in the session scope is: <c:out value = "${userid}"/>
</body>
</html>Output:
The defined value in the session scope is: 204
The example code above sets a session scope variable using the '<c:set>' tag and later prints the value of this scope variable to the next line using the '<c:out>' tag.