在JSP 中使用 JSTL 按不同條件輸出內容
<%@ page language="java" contentType="text/html;charset=UTF-8" %>
<%@ taglib uri="/WEB-INF/tld/c-rt.tld" prefix="c-rt" %>
<html>
<head>
<title>Java Code Geeks Snippets - Conditional Content with JSTL in JSP Page</title>
</head>
<body>
<%-- if condition --%>
<c-rt:if test='${param.myparam1 == "myvalue1"}'>
This is printed if parameter "myparam1" equals "myvalue1" </br>
</c-rt:if>
<%-- if/else condition --%>
<c-rt:choose>
<c-rt:when test='${param.myparam2 == "myvalue2"}'>
This is printed if parameter "myparam2" equals "myvalue2" </br>
</c-rt:when>
<c-rt:otherwise>
This is printed if parameter "myparam2" DOES NOT equal "myvalue2" </br>
</c-rt:otherwise>
</c-rt:choose>
<%-- multiple conditions --%>
<c-rt:choose>
<c-rt:when test='${param.myparam3 == "0"}'>
This is printed if parameter "myparam1" equals 0 </br>
</c-rt:when>
<c-rt:when test='${param.myparam3 == "1"}'>
This is printed if parameter "myparam1" equals 1 </br>
</c-rt:when>
<c-rt:otherwise>
This is printed for any other value of the parameter </br>
</c-rt:otherwise>
</c-rt:choose>
</body>
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