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JSP: EL String concatenation 

Dr. Xi
Joined:
04/09/2007
Posts:
710

June 16, 2010 16:06:51    Last update: June 16, 2010 16:06:51
The + operator which is used in Java to concatenate strings does not work in JSP. In JSP, you simply string them together without the + operator. 

<!DOCTYPE html>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<html>
<head>
<title>Test Page</title>
</head>

<body>
    <c:set var="majorVersion" value="1"/>
    <c:set var="minorVersion" value="03"/>
    Full version: <c:out value="${majorVersion}.${minorVersion}"/>
    <br>
    
    <c:set var="fullVersion" value="${majorVersion}.${minorVersion}"/>
    <c:if test="${'1.03' == fullVersion}">
	Can't use concatenation directly in test condition, set 
	variable fullVersion first!
    </c:if>
</body>
</html>
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