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The <c:set> tag is used to set variable values and object properties.
The <c:set> tag is a twin brother of the <jsp:setProperty> action tag.
This tag is very useful because it calculates the value of the expression and then uses the calculated result to set the value of a JavaBean object or java.util.Map object.
<c:set var="<string>" value="<string>" target="<string>" property="<string>" scope="<string>"/>
The <c:set> tag has the following attributes:
| Attribute | Description | Is it necessary | Default value |
|---|---|---|---|
| value | The value to be stored | No | The content of the subject |
| target | The object to which the attribute to be modified belongs | No | None |
| property | The attribute to be modified | No | None |
| var | Variable to store information | No | None |
| scope | The scope of var attribute | No | Page |
If the target attribute is specified, then the property attribute also needs to be specified.
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title>c:set Tag Example</title>
</head>
<body>
<c:set var="salary" scope="session" value="${2000*2">/>
<c:out value="${salary}"/>
</body>
</html>
The running result is as follows:
4000