PrimeExample.jsp Page that uses the PrimeTag custom tag
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!--
Illustration of PrimeTag 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 N-Digit Primes</TITLE>
<LINK REL=STYLESHEET
HREF="JSP-Styles.css"
TYPE="text/css">
</HEAD>
<BODY>
<H1>Some N-Digit Primes</H1>
<%@ taglib uri="cwp-taglib.tld" prefix="cwp" %>
<UL>
<LI>20-digit: <cwp:prime length="20" />
<LI>40-digit: <cwp:prime length="40" />
<LI>80-digit: <cwp:prime length="80" />
<LI>Default (50-digit): <cwp:prime />
</UL>
</BODY>
</HTML>
package cwp.tags;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.io.*;
/** Generates an N-digit random prime (default N = 50).
* Extends SimplePrimeTag, adding a length attribute
* to set the size of the prime. The doStartTag
* method of the parent class uses the len field
* to determine the approximate length of the prime.
* <P>
* Taken from Core Web Programming Java 2 Edition
* from Prentice Hall and Sun Microsystems Press,
* .
* May be freely used or adapted.
*/
public class PrimeTag extends SimplePrimeTag {
public void setLength(String length) {
try {
len = Integer.parseInt(length);
} catch(NumberFormatException nfe) {
len = 50;
}
}
}
PrimeExample.jsp Page that uses the PrimeTag custom tag
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