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Java/JSTL/Exceptions - История изменений
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Admin: 1 версия
2010-06-01T06:17:34Z
<p>1 версия</p>
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<td colspan="1" style="background-color: white; color:black; text-align: center;">Версия 06:17, 1 июня 2010</td>
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Admin
http://www.jexp.ru/index.php?title=Java/JSTL/Exceptions&diff=6736&oldid=prev
в 18:01, 31 мая 2010
2010-05-31T18:01:44Z
<p></p>
<p><b>Новая страница</b></p><div>== Catch an Exception? ==<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>Catch an Exception?</title><br />
</head><br />
<body><br />
<c:catch var="e"><br />
<c:set var="x" value="10" scope="page" /><br />
<c:set var="y" value="five" scope="page" /><br />
10 divided by 0 is <br />
<c:out value="${10/0}" /><br />
<br /><br />
</c:catch><br />
<c:if test="${e!=null}">The caught exception is:<br />
<c:out value="${e}" /><br />
<br /><br />
</c:if><br />
<c:if test="${e==null}">No exception was thrown<br />
<br /><br />
</c:if><br />
</body><br />
</html><br />
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</source><br />
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<!-- end source code --><br />
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== Catch an Exception in JSTL ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
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<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %><br />
<html><br />
<head><br />
<title>Catch an Exception</title><br />
</head><br />
<body><br />
<c:catch var="e"><br />
<c:set var="x" value="10" scope="page" /><br />
<c:set var="y" value="five" scope="page" /><br />
x divided by y is <br />
<c:out value="${x/y}" /><br />
<br /><br />
</c:catch><br />
<br /><br />
<c:if test="${e!=null}">The caught exception is:<br />
<c:out value="${e}" /><br />
<br /><br />
</c:if><br />
<c:if test="${e==null}">No exception was thrown<br />
<br /><br />
</c:if><br />
</body><br />
</html><br />
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<br />
</source><br />
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<!-- end source code --><br />
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== JSTL: catch Exception ==<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>The c:catch action</title><br />
</head><br />
<body><br />
<c:catch var="signalException"><br />
<%<br />
int i= (int) (Math.random() * 10);<br />
if (i < 5 )<br />
throw new NullPointerException(); %><br />
</c:catch><br />
<br />
<c:choose><br />
<c:when test="${signalException != null}"><br />
Exception occurs.<br />
</c:when><br />
<c:otherwise><br />
No Exception.<br />
</c:otherwise><br />
</c:choose><br />
</body><br />
</html><br />
<br />
<br />
</source><br />
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<!-- end source code --><br />
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== JSTL: Catch with if ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %><br />
<%<br />
int i= (int) (Math.random() * 10);<br />
pageContext.setAttribute("signalStrength", new Integer(i), PageContext.PAGE_SCOPE);<br />
%><br />
<html><br />
<head><br />
<title>The c:catch action</title><br />
</head><br />
<body><br />
<c:if test="${pageScope.signalStrength < 5}"><br />
<c:set var="signalFailure" value="true" scope="page" /><br />
</c:if><br />
<c:choose><br />
<c:when test="${pageScope.signalFailure == true}"><br />
Exception occurs.<br />
</c:when><br />
<c:otherwise><br />
No Exception.<br />
</c:otherwise><br />
</c:choose><br />
</body><br />
</html><br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
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== JSTL Exception: UnCaught Exception ==<br />
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<!-- start source code --><br />
<br />
<source lang="java"><br />
<br />
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %><br />
<html><br />
<head><br />
<title>Throw an Exception</title><br />
</head><br />
<body><br />
<c:set var="x" value="10" scope="page" /><br />
<c:set var="y" value="five" scope="page" /><br />
x divided by y is <br />
<c:out value="${x/y}" /><br />
<br /><br />
</body><br />
</html><br />
<br />
<br />
</source><br />
<br />
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<!-- end source code --><br />
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== JSTL Throw an Exception ==<br />
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<!-- start source code --><br />
<br />
<source lang="java"><br />
<br />
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %><br />
<html><br />
<head><br />
<title>Throw an Exception</title><br />
</head><br />
<body>10 divided by 0 is <br />
<c:out value="${10/0}" /><br />
<br /><br />
</body><br />
</html><br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --></div>