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| 23. 58. 11. Repeat Tag |
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package beans;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import java.util.HashMap;
import java.io.IOException;
/**
* SimpleTag handler that accepts a num attribute and
* invokes its body 'num' times.
*/
public class RepeatSimpleTag extends SimpleTagSupport {
private int num;
public void doTag() throws JspException, IOException {
for (int i=0; i<num; i++) {
getJspContext().setAttribute("count", String.valueOf( i + 1 ) );
getJspBody().invoke(null);
}
}
public void setNum(int num) {
this.num = num;
}
}
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web.xml |
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<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<taglib>
<taglib-uri>
http://jakarta.apache.org/tomcat/jsp2-example-taglib
</taglib-uri>
<taglib-location>
/WEB-INF/tags/jsp2-example-taglib.tld
</taglib-location>
</taglib>
<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.com/jstl/fmt</taglib-uri>
<taglib-location>/WEB-INF/fmt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/fmt-rt</taglib-uri>
<taglib-location>/WEB-INF/fmt-rt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/c.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/core-rt</taglib-uri>
<taglib-location>/WEB-INF/c-rt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/sql</taglib-uri>
<taglib-location>/WEB-INF/sql.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/sql-rt</taglib-uri>
<taglib-location>/WEB-INF/sql-rt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/x</taglib-uri>
<taglib-location>/WEB-INF/x.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/x-rt</taglib-uri>
<taglib-location>/WEB-INF/x-rt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>
http://java.jeffheaton.com/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>
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jsp2-example-taglib.tld |
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<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<%@ taglib prefix="tags" uri="http://jakarta.apache.org/tomcat/jsp2-example-taglib"%>
<html>
<head>
<title>JSP 2.0 Examples - Repeat SimpleTag Handler</title>
</head>
<body>
<h1>JSP 2.0 Examples - Repeat SimpleTag Handler</h1>
<hr>
<P>This tag handler accepts a "num" parameter and repeats the body of the
tag "num" times. It's a simple example, but the implementation of
such a tag in JSP 2.0 is substantially simpler than the equivalent
JSP 1.2-style classic tag handler.</p>
<P>The body of the tag is encapsulated in a "JSP Fragment" and passed
to the tag handler, which then executes it five times, inside a
for loop. The tag handler passes in the current invocation in a
scoped variable called count, which can be accessed using the EL.</p>
<br>
<b><u>Result:</u></b><br>
<mytag:repeat num="5">
Invocation <c:out value="${count}"/> of 5<br>
</mytag:repeat>
</body>
</html>
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 Download: RepeatTag.zip( 1,083 k) |
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