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Java/JSP/Page Context - История изменений
2026-04-11T09:14:48Z
История изменений этой страницы в вики
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http://jexp.ru/index.php?title=Java/JSP/Page_Context&diff=8707&oldid=prev
Admin: 1 версия
2010-06-01T07:10:47Z
<p>1 версия</p>
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<td colspan="1" style="background-color: white; color:black; text-align: center;">← Предыдущая</td>
<td colspan="1" style="background-color: white; color:black; text-align: center;">Версия 07:10, 1 июня 2010</td>
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Admin
http://jexp.ru/index.php?title=Java/JSP/Page_Context&diff=8706&oldid=prev
в 18:01, 31 мая 2010
2010-05-31T18:01:47Z
<p></p>
<p><b>Новая страница</b></p><div>== Application Object ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
//File Name: application_page1.jsp<br />
<%<br />
String theSharedObject = "JSP is cool";<br />
application.setAttribute("message", theSharedObject);<br />
%><br />
<HTML><br />
<HEAD><br />
<TITLE>Application Object - Page 1</TITLE><br />
</HEAD><br />
<BODY><br />
This page sets data that can be retrieved by other pages in the application.<P><br />
Click to see this in action.<br />
</BODY><br />
</HTML><br />
//File Name:application_page2.jsp<br />
<%<br />
// getAttribute() returns a java.lang.Object, so need to cast<br />
String theSharedObject = (String) application.getAttribute("message");<br />
%><br />
<HTML><br />
<HEAD><br />
<TITLE>Application Object - Page 2</TITLE><br />
</HEAD><br />
<BODY><br />
This page retrieves the message that was stored in the <i>application</i> object by another page.<br />
<P><br />
The message is <b><%= theSharedObject %></b><br />
</BODY><br />
</HTML><br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
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<br />
== JSP page scope ==<br />
<br />
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<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
<jsp:useBean id="myBookBean" class="com.jexp.Book"<br />
scope="page" /><br />
<html><br />
<head><br />
<title>page scope</title><br />
</head><br />
<body><br />
This page declares a page-scoped Book.<br />
</body><br />
</html><br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
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== Page directive attributes ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
<%@ page autoFlush="true"<br />
buffer="16kb"<br />
contentType="text/html"<br />
errorPage="myErrorPage.jsp"<br />
extends="org.apache.jasper.runtime.HttpJspBase"<br />
import="java.sql.*"<br />
info="This page has a set of page directive attributes"<br />
language="java"<br />
pageEncoding="UTF-8"<br />
session="false"<br />
%><br />
<HTML><br />
<HEAD><TITLE>Page directive attributes</TITLE></HEAD><br />
<BODY><br />
The JSP page used to generate this content defined values for all of the page directive"s <br />
attributes.<br />
</BODY><br />
</HTML><br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
== Set JSP PageContext attributes ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
<%@ taglib prefix="c" uri="http://java.sun.ru/jstl/core" %><br />
<%<br />
synchronized (pageContext) {<br />
Class thisClass = getClass();<br />
// session.setAttribute("thisClass", thisClass);<br />
pageContext.setAttribute("thisClass", thisClass, PageContext.PAGE_SCOPE);<br />
System.out.println("Stored reference");<br />
Class theClass = (Class) pageContext.getAttribute("thisClass", PageContext.PAGE_SCOPE);<br />
System.out.println("The retrieved reference is " + theClass);<br />
}<br />
%><br />
<html><br />
<body><br />
The class that instantiated this JSP is <c:out value="${pageScope.thisClass.name}" />.<br />
</body><br />
</html><br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
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== Set page parameters ==<br />
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<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
<html><br />
<head><br />
<title>Set page parameters</title><br />
</head><br />
<body><br />
This page allows you to enter information that is sent as request<br />
parameters to another page. The next page lists them. <P /><br />
<form action="listPageParameters.jsp" method="get"><br />
<table><br />
<tr><td>Enter an adjective:</td><br />
<td><input type="text" name="adjective" /></td><br />
</tr><br />
<tr><td>Enter a noun:</td><br />
<td><input type="text" name="noun" /></td><br />
</tr><br />
<tr><td>Enter a color:</td><br />
<td><input type="text" name="color" /></td><br />
</tr><br />
</table><br />
<input type="submit" value="Send parameters" /><br />
</form><br />
</body><br />
</html><br />
//listPageParameters.jsp<br />
<br />
<%@ taglib prefix="c" uri="http://java.sun.ru/jstl/core" %><br />
<html><br />
<head><br />
<title>List page parameters</title><br />
</head><br />
<body><br />
You entered the following parameters:<br /><br />
<ol><br />
<%-- "param" is an implicit object. It is a Map that maps a "key"<br />
(the parameter name) to a "value" --%><br />
<c:forEach var="pageParameter" items="${param}"><br />
<li> <c:out value="${pageParameter.key}" /> = <c:out value="${pageParameter.value}" /><br />
</c:forEach><br />
</ol><br />
</body><br />
</html><br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --></div>