Java Tutorial/JSTL/Set — различия между версиями
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Текущая версия на 15:23, 31 мая 2010
Содержание
Do Calculation In Set
<%@ taglib prefix="c" uri="http://java.sun.ru/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.ru/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="${1 + 2 * 4 - 6 / 2}"/>
<c:out value="${appleCount}" />
</body>
</html>
JSTL Set With Body
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
<head>
<title>Set Examples</title>
</head>
<body>
<h3>Set With Body</h3>
<c:set var="str">Hello, Again World</c:set>
str =
<c:out value="${str}" />
<br />
</body>
</html>
JSTL Set Without Body
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
<head>
<title>Set Examples</title>
</head>
<body>
<h3>Set With No Body</h3>
<c:set var="str" value="Hello World" />
str =
<c:out value="${str}" />
<br />
</body>
</html>
Remove Variable
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
<head>
<title>Set Examples</title>
</head>
<body>
<h3>Remove Example</h3>
<c:set var="test" value="Hello World" scope="page" />
The value in the variable test before remove is
<c:out value="${test}" />
<br />
<c:remove var="test" scope="page" />
The value in the variable test after remove is
<c:out value="${test}" />
<br />
</body>
</html>
Set Comma Delimited String to Variable
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.ru/jstl/core-rt" prefix="c-rt" %>
<html>
<head>
<title>Count to 10 Example(tracking even and odd)</title>
</head>
<body>
<c:set var="days" value="A,B,C,D,E,F,G" />
<table border="0">
<c:forEach var="i" items="${days}" varStatus="status">
<jsp:useBean id="status"
type="javax.servlet.jsp.jstl.core.LoopTagStatus" />
<c-rt:choose>
<c-rt:when test="<%=status.getCount()%2==0%>">
<c:set var="color" value="#cccccc" />
</c-rt:when>
<c-rt:otherwise>
<c:set var="color" value="#dddddd" />
</c-rt:otherwise>
</c-rt:choose>
<tr>
<td width="200" bgcolor="<c:out value="${color}"/>">
<c:out value="${i}" />
</td>
</tr>
</c:forEach>
</table>
</body>
</html>
Set Value for Variable
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<table border="1">
<tr>
<TH>Scoped Variable</th>
<TH>Current Value</th>
</tr>
<tr>
<td>
<b>Page Scope</b>
(scopeVarPage)</td>
<td> 
<c:out value="${scopeVarPage}" />
</td>
</tr>
<tr>
<td>
<b>Request Scope</b>
(scopeVarRequest)</td>
<td> 
<c:out value="${scopeVarRequest}" />
</td>
</tr>
<tr>
<td>
<b>Session Scope</b>
(scopeVarSession)</td>
<td> 
<c:out value="${scopeVarSession}" />
</td>
</tr>
<tr>
<td>
<b>Application Scope</b>
(applicationVarPage)</td>
<td> 
<c:out value="${scopeVarApplication}" />
</td>
</tr>
</table>
Set Variable as Session Scope
<%@ taglib prefix="c" uri="http://java.sun.ru/jstl/core" %>
<html>
<body>
This JSP stores the ultimate answer in a session-scoped variable where
the other JSPs in the web application can access it.
<p />
<c:set var="theUltimateAnswer" value="${41+1}" scope="session" />
Click
== Set Variable Scope Page ==
<!-- start source code -->
<source lang="java">
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
<head>
<title>Set in Scope Examples</title>
</head>
<body>
<c:set var="test" value="Page Level Value" scope="page" />
<table border="1">
<tr>
<td>
<b>Default Level</b>
</td>
<td>
<c:out value="${test}" />
</td>
</tr>
<tr>
<td>
<b>Page Level</b>
</td>
<td>
<c:out value="${pageScope.test}" />
</td>
</tr>
<tr>
<td>
<b>Request Level</b>
</td>
<td>
<c:out value="${requestScope.test}" />
</td>
</tr>
<tr>
<td>
<b>Session Level</b>
</td>
<td>
<c:out value="${sessionScope.test}" />
</td>
</tr>
<tr>
<td>
<b>Application Level</b>
</td>
<td>
<c:out value="${applicationScope.test}" />
</td>
</tr>
</table>
</body>
</html>
Set Variable Scope to Application
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
<head>
<title>Set in Scope Examples</title>
</head>
<body>
<c:set var="test" value="Application Level Value" scope="application" />
<table border="1">
<tr>
<td>
<b>Default Level</b>
</td>
<td>
<c:out value="${test}" />
</td>
</tr>
<tr>
<td>
<b>Page Level</b>
</td>
<td>
<c:out value="${pageScope.test}" />
</td>
</tr>
<tr>
<td>
<b>Request Level</b>
</td>
<td>
<c:out value="${requestScope.test}" />
</td>
</tr>
<tr>
<td>
<b>Session Level</b>
</td>
<td>
<c:out value="${sessionScope.test}" />
</td>
</tr>
<tr>
<td>
<b>Application Level</b>
</td>
<td>
<c:out value="${applicationScope.test}" />
</td>
</tr>
</table>
</body>
</html>
Set Variable Scope to Request
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
<head>
<title>Set in Scope Examples</title>
</head>
<body>
<c:set var="test" value="Request Level Value" scope="request" />
<table border="1">
<tr>
<td>
<b>Default Level</b>
</td>
<td>
<c:out value="${test}" />
</td>
</tr>
<tr>
<td>
<b>Page Level</b>
</td>
<td>
<c:out value="${pageScope.test}" />
</td>
</tr>
<tr>
<td>
<b>Request Level</b>
</td>
<td>
<c:out value="${requestScope.test}" />
</td>
</tr>
<tr>
<td>
<b>Session Level</b>
</td>
<td>
<c:out value="${sessionScope.test}" />
</td>
</tr>
<tr>
<td>
<b>Application Level</b>
</td>
<td>
<c:out value="${applicationScope.test}" />
</td>
</tr>
</table>
</body>
</html>
Set Variable To Page Scope
<%@ taglib prefix="c" uri="http://java.sun.ru/jstl/core" %>
<c:set var="names" value="A B C, D" scope="page" />
<html>
<head>
<title>forEach and status</title>
</head>
<body>
<c:forEach items="${pageScope.names}"
var="currentName"
varStatus="status"
>
Family member #<c:out value="${status.count}" /> is
<c:out value="${currentName}" /> <br />
</c:forEach>
</body>
</html>
