RepeatTag.java Custom tag that repeats the tag body a specified number of times
package cwp.tags;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.io.*;
/** A tag that repeats the body the specified
* number of times.
* <P>
* Taken from Core Web Programming Java 2 Edition
* from Prentice Hall and Sun Microsystems Press,
* .
* May be freely used or adapted.
*/
public class RepeatTag extends BodyTagSupport {
private int reps;
public void setReps(String repeats) {
try {
reps = Integer.parseInt(repeats);
} catch(NumberFormatException nfe) {
reps = 1;
}
}
public int doAfterBody() {
if (reps-- >= 1) {
BodyContent body = getBodyContent();
try {
JspWriter out = body.getEnclosingWriter();
out.println(body.getString());
body.clearBody(); // Clear for next evaluation
} catch(IOException ioe) {
System.out.println("Error in RepeatTag: " + ioe);
}
return(EVAL_BODY_TAG);
} else {
return(SKIP_BODY);
}
}
}
RepeatExample.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!--
Illustration of RepeatTag tag.
Taken from Core Web Programming Java 2 Edition
from Prentice Hall and Sun Microsystems Press,
.
May be freely used or adapted.
-->
<HTML>
<HEAD>
<TITLE>Some 40-Digit Primes</TITLE>
<LINK REL=STYLESHEET
HREF="JSP-Styles.css"
TYPE="text/css">
</HEAD>
<BODY>
<H1>Some 40-Digit Primes</H1>
Each entry in the following list is the first prime number
higher than a randomly selected 40-digit number.
<%@ taglib uri="cwp-taglib.tld" prefix="cwp" %>
<OL>
<!-- Repeats N times. A null reps value means repeat once. -->
<cwp:repeat reps='<%= request.getParameter("repeats") %>'>
<LI><cwp:prime length="40" />
</cwp:repeat>
</OL>
</BODY>
</HTML>
RepeatTag.java Custom tag that repeats the tag body a specified number of times
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