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J2EE —— 第 13 章 Java Serer Pages 文档

J2EE —— 第 13 章 Java Serer Pages 文档. JSP 文档的好处. 编辑 验证 名称空间 数据交换 简化了复杂性 提高了灵活度. 标准语法和 XML 语法. 创建 JSP 文档. <%@ taglib uri= " http://java.sun.com/jsp/jstl/core " prefix="c" %> <img src="duke.waving.gif"> <input type="text" name="username" size="25">

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J2EE —— 第 13 章 Java Serer Pages 文档

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  1. J2EE——第13章JavaSerer Pages文档

  2. JSP文档的好处 • 编辑 • 验证 • 名称空间 • 数据交换 • 简化了复杂性 • 提高了灵活度

  3. 标准语法和XML语法

  4. 创建JSP文档 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <img src="duke.waving.gif"> <input type="text" name="username" size="25"> <c:if test="${fn:length(userNameBean.name) > 0}" > <%@include file="response.jsp" %> <html xmlns:c="http://java.sun.com/jsp/jstl/core"> <img src="duke.waving.gif" /> <input type="text" name="username" size="25" /> <c:if test="${fn:length(userNameBean.name) gt 0}" > <jsp:directive.include="response.jsp" /> • 保存为.jspx

  5. 声明标签库 <books xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:c="http://java.sun.com/jsp/jstl/core" xmlns:u="urn:jsptld:/WEB-INF/tlds/my.tld“ xmlns:u1="urn:jsptagdir:/WEB-INF/tags/mytaglibs/"> <books> <jsp:useBean xmlns:jsp="http://java.sun.com/JSP/Page" id="bookDB" class="database.BookDB" scope="page"> <jsp:setProperty name="bookDB" property="database" value="${bookDBAO}" /> </jsp:useBean> <c:forEach xmlns:c="http://java.sun.com/jsp/jstl/core" var="book" begin="0" items="${bookDB.books}"> ... </c:forEach> </books>

  6. 在JSP文档中包括指令 <books xmlns:jsp="http://java.sun.com/JSP/Page"> <jsp:directive.page errorPage="errorpage.jsp" /> ... </books> <jsp:root version="2.0" > <books ...> ... </books> <jsp:directive.include file="magazine.jspx" /> </jsp:root>

  7. 创建静态内容 <c:forEach var="counter" begin="1" end="${3}"> <jsp:text>${counter}</jsp:text> </c:forEach> • <jsp:text>保留所有空白字符#x20,#x9,#xD,#xA <c:forEach var="i" begin="1" end="${x}"> <![CDATA[<blockquote>]]> </c:forEach> ... <c:forEach var="i" begin="1" end="${x}"> <![CDATA[</blockquote>]]> </c:forEach>

  8. 创建动态内容 • EL表达式、脚本元素、标准动作、定制标签 • JSP文档中，EL操作符<、>、<=、>=、!=要分别替换为lt、gt、le、ge、ne <jsp:element name="${content.headerName}" xmlns:jsp="http://java.sun.com/JSP/Page"> <jsp:attribute name="lang">${content.lang}</jsp:attribute> <jsp:body>${content.body}</jsp:body> </jsp:element> <h1 lang="fr">Heading in French</h1> <jsp:declaration> declaration goes here </jsp:declaration> <jsp:scriptlet> code fragment goes here </jsp:scriptlet> <jsp:expression> expression goes here </jsp:expression>

  9. 使用jsp:root和jsp:output元素 <jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.0" > <books>...</books> <magazines>...</magazines> </jsp:root> <jsp:output doctype-root-element="books" doctype-system="books.dtd" /> <!DOCTYPE books SYSTEM "books.dtd" > • 生成XML声明 <?xml version="1.0" encoding="UTF-8" ?> • <jsp:output omit-xml-declaration=“false" /> • 没有jsp:root

  10. 确定JSP文档到容器 • 在web.xml中将jspproperty-group的is-xml元素设置为true • 使用Java Servlet规范2.4版本的web.xml文件，并为JSP文档提供.jspx扩展名 • 在JSP文档中包含一个jsp:root元素

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