-- 作者：admin
-- 发布时间：2009/5/6 22:52:11
-- 一个EL的练习
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<html>
<head>
<title>EL Expression Examples</title>
</head>
<body>
<h1>EL Expression Examples</h1>
<h2>Arithmetic Operators in Expressions</h2>
<c:set var="appleCount" value="${1 + 2 * 4 - 6 / 2}" />
<b>There are ${1 + 2 * 4 - 6 / 2} apples on the table.</b>
<br />
<b>There are <fmt:formatNumber pattern="00000"> ${1 + 2 * 4 - 6 / 2}</fmt:formatNumber>
apples on the table.</b>
<br />
<b>It feels like ${-4 - 8} degree today.</b>
<br />
<c:set var="myGrade" value="11" />
<br />
<b>The average grade is ${(myGrade == 10) ? "perfect" : "good"}. </b>
<br />
<b>There are ${23/54} remaining. </b>
<br />
<b>There are ${6 div 2} apples on the table.</b>
<br />
<b>There are ${2003 div 8} apples on the table.</b>
<br />
<b>There are ${2003 mod 8} apples on the table.</b>
<br />
<b>There are ${2003 % 8} apples on the table.</b>
<br />
<h2>Logical Operators</h2>
<c:set var="guess" value="12" />
<b>Your guess is ${guess}.</b>
<br />
<c:if test="${(guess >= 10) && (guess <= 20)}">
<b>You\'re in range!</b>
<br />
</c:if>
<c:if test="${(guess < 10) || (guess > 20)}">
<b>Try again!</b>
<br />
</c:if>
<c:set var="guess" value="1" />
<b>Your guess is ${guess}.</b>
<br />
<c:if test="${(guess >= 10) and (guess <= 20)}">
<b>You\'re in range!</b>
<br />
</c:if>
<c:if test="${(guess < 10) or (guess > 20)}">
<b>Try again!</b>
<br />
</c:if>
<h2>Comparison Operators</h2>
4 > \'3\' ${4 > \'3\'}
<br />
\'4\' > 3 ${\'4\' > 3}
<br />
\'4\' > \'3\' ${\'4\' > \'3\'}
<br />
4 >= 3 ${4 >= 3}
<br />
4 <= 3 ${4 < 3}
<br />
4 == \'4\' ${4 == 4}
<br />
<h2>empty Operator</h2>
empty "" ${empty ""}
<br />
empty "sometext" ${empty "sometext"}<br/> empty Junk ${empty Junk}
<br />
empty guess ${empty guess}
<br />
<h2>Boolean and Null Values</h2>
<c:set var="StrVar" value="true" />
<c:if test="${StrVar}">
equal!
</c:if>
<br />
null == null ${null == null}
<br />
"null" == null ${"null" == null}
<br />
</body>
</html>
注意：
<fmt:formatNumber pattern="#####"> ${1 + 2 * 4 - 6 / 2}</fmt:formatNumber>可以去除小数点
[此贴子已经被作者于2010-12-12 11:01:07编辑过]
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