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Java Tutorial/JSTL/If - История изменений
2026-04-22T08:13:21Z
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http://www.jexp.ru/index.php?title=Java_Tutorial/JSTL/If&diff=3397&oldid=prev
в 17:44, 31 мая 2010
2010-05-31T17:44:26Z
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http://www.jexp.ru/index.php?title=Java_Tutorial/JSTL/If&diff=3398&oldid=prev
Admin: 1 версия
2010-05-31T15:23:27Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>== JSTL If Else Statement ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %><br />
<html><br />
<head><br />
<title>Using Choose,Otherwise and When</title><br />
</head><br />
<body><br />
<c:if test="${pageContext.request.method=="POST"}">Ok, we"ll<br />
send <br />
<c:out value="${param.enter}" /><br />
<c:choose><br />
<c:when test="${param.enter=="1"}">pizza.<br />
<br /><br />
</c:when><br />
<c:otherwise>pizzas.<br />
<br /><br />
</c:otherwise><br />
</c:choose><br />
</c:if><br />
<form method="post">Enter a number between 1 and 5:<br />
<input type="text" name="enter" /><br />
<input type="submit" value="Accept" /><br />
<br /><br />
</form><br />
</body><br />
</html></source><br />
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<!-- end source code --><br />
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== JSTL If Statement ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %><br />
<html><br />
<head><br />
<title>If with Body</title><br />
</head><br />
<body><br />
<c:if test="${pageContext.request.method=="POST"}"><br />
<c:if test="${param.guess=="5"}">You guessed my number!<br />
<br /><br />
<br /><br />
<br /><br />
</c:if><br />
<c:if test="${param.guess!="5"}">You did not guess my number!<br />
<br /><br />
<br /><br />
<br /><br />
</c:if><br />
</c:if><br />
<form method="post">Guess what number I am thinking of?<br />
<input type="text" name="guess" /><br />
<input type="submit" value="Try!" /><br />
<br /><br />
</form><br />
</body><br />
</html></source><br />
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<!-- end source code --><br />
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== JSTL If Statement without Body ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %><br />
<html><br />
<head><br />
<title>If with NO Body</title><br />
</head><br />
<body><br />
<c:if test="${pageContext.request.method=="POST"}"><br />
<c:if test="${param.guess=="5"}" var="result" /><br />
I tested to see if you picked my number, the result was <br />
<c:out value="${result}" /><br />
</c:if><br />
<form method="post">Guess what number I am thinking of?<br />
<input type="text" name="guess" /><br />
<input type="submit" value="Try!" /><br />
<br /><br />
</form><br />
</body><br />
</html></source><br />
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<!-- end source code --><br />
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== JSTL If Statement with True Value ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %><br />
<HTML><br />
<HEAD><TITLE>JSTL "if" tag</TITLE></HEAD><br />
<BODY><br />
<c:if test="true">Hello world!</c:if><br />
</BODY><br />
</HTML></source><br />
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<!-- end source code --><br />
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== JSTL If With Logical Operator And/Or ==<br />
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<!-- start source code --><br />
<br />
<source lang="java"><br />
<%@ taglib prefix="c" uri="http://java.sun.ru/jstl/core" %><br />
<%@ taglib prefix="fmt" uri="http://java.sun.ru/jstl/fmt" %><br />
<html><br />
<head><br />
<title>EL Expression Examples</title><br />
</head><br />
<body><br />
<h1>EL Expression Examples</h1><br />
<h2>Logical Operators</h2><br />
<c:set var="guess" value="12"/><br />
<b>Your guess is </b><br />
<c:out value="${guess}"/><br />
<br/><br />
<c:if test="${(guess >= 10) && (guess <= 20)}"><br />
<b>You"re in range!</b><br/><br />
</c:if><br />
<c:if test="${(guess < 10) || (guess > 20)}"><br />
<b>Try again!</b><br/><br />
</c:if><br />
</body><br />
</html></source><br />
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<!-- end source code --><br />
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== NULL value And Boolean ==<br />
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<!-- start source code --><br />
<br />
<source lang="java"><br />
<%@ taglib prefix="c" uri="http://java.sun.ru/jstl/core" %><br />
<%@ taglib prefix="fmt" uri="http://java.sun.ru/jstl/fmt" %><br />
<html><br />
<head><br />
<title>EL Expression Examples</title><br />
</head><br />
<body><br />
<h1>EL Expression Examples</h1><br />
<br />
<h2>Boolean and Null Values</h2><br />
<c:set var="StrVar" value="true"/><br />
<c:if test="${StrVar}"><br />
equal!<br />
</c:if><br/><br />
null == null<br />
<c:out value="${null == null}"/><br />
<br />
</body><br />
</html></source><br />
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<!-- end source code --><br />
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== Set Test Result to Variable ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
<!--<br />
Licensed to the Apache Software Foundation (ASF) under one or more<br />
contributor license agreements. See the NOTICE file distributed with<br />
this work for additional information regarding copyright ownership.<br />
The ASF licenses this file to You under the Apache License, Version 2.0<br />
(the "License"); you may not use this file except in compliance with<br />
the License. You may obtain a copy of the License at<br />
http://www.apache.org/licenses/LICENSE-2.0<br />
Unless required by applicable law or agreed to in writing, software<br />
distributed under the License is distributed on an "AS IS" BASIS,<br />
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<br />
See the License for the specific language governing permissions and<br />
limitations under the License.<br />
--><br />
<html><br />
<head><br />
<title>Tag Plugin Examples: if</title><br />
</head><br />
<body><br />
<h1>Tag Plugin Examples - &lt;c:if></h1><br />
<hr><br />
<font color="#000000"/><br />
</br><br />
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %><br />
<h3>Set the test result to a variable</h3><br />
<c:if test="${1==1}" var="theTruth" scope="session"/><br />
The result of testing for (1==1) is: ${theTruth}<br />
<h3>Conditionally execute the body</h3><br />
<c:if test="${2>0}"><br />
It"s true that (2>0)!<br />
</c:if><br />
</body><br />
</html></source><br />
<br />
<br />
<!-- end source code --></div>
Admin