Tài liệu Fallback element

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Including Files and Applets in JSP Pages 1 Table of content • The jsp:include action Using jsp:include to include pages at request time. • The include directive To include files at page translation time. • The jsp:plugin action To include applets for the Java Plug-in. 2 Including Pages at RequestTime: jsp:include • Format • • Purpose • To reuse JSP, HTML, or plain text content • To permit updates to the included content without changing the main JSP page(s) 3 Including Pages at RequestTime: jsp:include • Function A portable mechanism that lets you insert any of the following into the JSP output: The content of an HTML page The content of a plain text document The ouput of JSP page The output of a servlet 4 Including Pages at RequestTime: jsp:include The page Attribute: • URLs that do not start with a slash are interpreted relative to the location of the main page( main directory). • URLs that start with a slash are interpreted relative to the base Web application directory, not relative to the server root. http://host/headlines/sports/table-tennis.jsp. Ex:  5 Including Pages at RequestTime: jsp:include • Notes • Output can not contain JSP. • You are permitted to include files from WEB-INF. • Url start with slashes  The server always interprets them relative to the current Web application.  The browser always interprets them relative to the server root. 6 Including Pages at RequestTime: jsp:include The flush Attribute • This attribute is optional. • The output stream of the main page should flushed before the inclusion of the page 7 Including Pages at RequestTime: jsp:include • Example: A news Headline page … Here is a summary of our three most recent news stories:
8 Including Pages at RequestTime: jsp:include 9 Including Files at Page Translation Time: <%@ include … %> • Format • <%@ include file="Relative address" %> • Purpose • To reuse JSP content in multiple pages 10 • Including Files at Page Translation Time: <%@ include … Example <%--%> footer.jsp --% > The include Directive Example

The include Directive Example



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

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Including Files at Page Translation Time: • Differences between jsp:include and include directive <%@ include … %> 12 Including Files at Page Translation Time: <%@ include … %> • Example: Reusing Footers SomeRandomPage.jsp ContactSection.jsp …… bla, bla bla <%@ include file="/WEBINF/ContactSection.jsp" %> <%! private int accessCount = 0; private Date accessDate = new Date(); %> …… This page has been accessed <%= ++accessCount %> at <%= accessDate %>. 13 Including Files at Page Translation Time: <%@ include … %> • Example: Reusing Footers 14 Applets and jsp:plugin • What is applets 15 • What is applets Applets and jsp:plugin 16 Applets and jsp:plugin • Why Applets? • When UI requirements demand it • Major drawbacks • Alternatives • Options for Deploying Applets • Develop the applets with JDK 1.1 or even 1.02 • Have users install any version of the Java 2 Plug-in, then use Java 2 for the applets • Have users install version 5 or 6 of the Java Runtime Environment (JRE), then use JDK 1.5/1.6 for the applets 17 • Using jsp:plugin • APPLET Tag Applets and jsp:plugin • Equivalent jsp:plugin 18 Applets and jsp:plugin WindowUtilities.java public static void setNativeLookAndFeel() • Example PluginApplet.jsp PluginApplet.java public void init() TextPanel.java DrawingPanel drawingPanel; public TextPanel() DrawingPanel.java public void paintComponent(Graphics g) public void setFontName(String fontName) 19 Applets and jsp:plugin • Example 20
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