Java Tutorial/JSTL/Introduction
Содержание
JSTL in XML Format
<source lang="java">
<?xml version="1.0"?>
<jsp:root xmlns:jsp="http://java.sun.ru/JSP/Page"
version="1.2">
<jsp:directive.page contentType="text/html"/> <jsp:directive.page import="java.util.Date, java.util.Locale"/> <jsp:directive.page import="java.text.*"/> <jsp:declaration>
String getDateTimeStr(Locale l) {
DateFormat df = SimpleDateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.MEDIUM, l);
return df.format(new Date());
}
</jsp:declaration> <html> <head>
<title>Example JSP in XML format</title>
</head>
<body>
This is the output of a simple JSP using XML format.
<jsp:scriptlet> // Note we need to declare CDATA because we don"t escape the less than symbol
for (int i = 1; i <=10; i++) {
out.println(i);
if (i < 10) {
out.println(", ");
}
}
</jsp:scriptlet>
Use a jsp:expression to write the date and time in the browser"s locale: <jsp:expression>getDateTimeStr(request.getLocale())</jsp:expression>
<jsp:text>
<p>This sentence is enclosed in a jsp:text element.</p>
</jsp:text> </body> </html> </jsp:root></source>
JSTL JSP XML Format Page
<source lang="java">
<tags:xhtmlbasic xmlns:tags="urn:jsptagdir:/WEB-INF/tags"
xmlns:jsp="http://java.sun.ru/JSP/Page" xmlns:fmt="http://java.sun.ru/jstl/fmt" xmlns="http://www.w3.org/1999/xhtml"> <jsp:directive.page contentType="text/html" /> <head> <title>JSPX - XHTML Basic Example</title> </head> <body>
JSPX - XHTML Basic Example
<p/>
<p/>
<p/>
<jsp:useBean id="now" class="java.util.Date" />
<fmt:formatDate value="${now}" pattern="MMMM d, yyyy, H:mm:ss"/>
</body>
</tags:xhtmlbasic></source>
Setup Environment for Development Custom Tag
MyTag.java
<source lang="java">
package taglib; import javax.servlet.jsp.*; import javax.servlet.jsp.tagext.*; import java.io.IOException; public class MyTag extends TagSupport {
public int doStartTag() throws JspException
{
return EVAL_BODY_INCLUDE;
}
public int doAfterBody() throws JspException
{
System.out.println("Hello!");
return SKIP_BODY;
}
}</source>
Setup Environment for JSTL
web.xml
<source lang="java">
<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.ru/dtd/web-app_2_3.dtd"> <web-app>
<context-param> <param-name>javax.servlet.jsp.jstl.fmt.timeZone</param-name> <param-value>US/Central</param-value> </context-param> <context-param> <param-name>database-driver</param-name> <param-value>org.gjt.mm.mysql.Driver</param-value> </context-param> <context-param> <param-name>database-url</param-name> <param-value> jdbc:mysql://localhost/forum?user=forumuser</param-value> </context-param> <taglib> <taglib-uri>http://java.sun.ru/jstl/fmt</taglib-uri> <taglib-location>/WEB-INF/fmt.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java.sun.ru/jstl/fmt-rt</taglib-uri> <taglib-location>/WEB-INF/fmt-rt.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java.sun.ru/jstl/core</taglib-uri> <taglib-location>/WEB-INF/c.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java.sun.ru/jstl/core-rt</taglib-uri> <taglib-location>/WEB-INF/c-rt.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java.sun.ru/jstl/sql</taglib-uri> <taglib-location>/WEB-INF/sql.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java.sun.ru/jstl/sql-rt</taglib-uri> <taglib-location>/WEB-INF/sql-rt.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java.sun.ru/jstl/x</taglib-uri> <taglib-location>/WEB-INF/x.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java.sun.ru/jstl/x-rt</taglib-uri> <taglib-location>/WEB-INF/x-rt.tld</taglib-location> </taglib> <taglib> <taglib-uri> http://java.jeffheaton.ru/taglib/jstl/forum</taglib-uri> <taglib-location>/WEB-INF/forum.tld</taglib-location> </taglib> <taglib> <taglib-uri>/tlt</taglib-uri> <taglib-location>/WEB-INF/taglib.tld</taglib-location> </taglib>
</web-app></source>
