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Jsp的表达式语言(el)

2008-04-12 22:29 531 查看

推荐网址：

http://www.oracle.com/technology/global/cn/sample_code/tutorials/jsp20/simpleel.html

http://www.ibm.com/developerworks/cn/java/j-jstl0211/

实例：

<%@page contentType="text/html"%>

<%@page pageEncoding="UTF-8"%>

<%--

The taglib directive below imports the JSTL library. If you uncomment it,

you must also add the JSTL library to the project. The Add Library... action

on Libraries node in Projects view can be used to add the JSTL 1.1 library.

--%>

<%--

<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

--%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

"http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

</head>

<body>

<%@ include file="test.jsp" %>

pageContext.setAttribute("color","#FFFFCC");

<h1>变化的背景色</h1>

<h1>比较运算符</h1>

<b>

4 > 3 $...{4 > 3}<br/>

4 < 3 $...{4 < 3}<br/>

4 ≥ 3 $...{4 >= 3}<br/>

4 ≤ 3 $...{4 le 3} <br/>

4 = 4 $...{4 == 4}

</b>

<h1>Empty 运算符</h1>

$...{empty(Null)}

$...{empty("test")}

<b>

</b>

<%--

This example uses JSTL, uncomment the taglib directive above.

To test, display the page like this: index.jsp?sayHello=true&name=Murphy

--%>

<%--

<c:if test="${param.sayHello}">

Hello $...{param.name}!

</c:if>

--%>

</body>

</html>

结果：

test

JSP Page

变化的背景色

比较运算符

4 > 3 true
4 < 3 false
4 ≥ 3 true
4 ≤ 3 false
4 = 4 true

Empty 运算符

true false

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标签： jsp 语言 html null c

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