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PowerTag.java
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/*
* Created on 02.11.2004
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package de.th.web;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
/**
* @author thohened
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class PowerTag implements IterationTag {
PageContext pageContext;
private int number;
private int power;
private int counter;
private int result = 1;
public void setNumber(int number) {
this.number = number;
}
public void setPower(int power) {
this.power = power;
}
public void setParent(Tag t) {
}
public void setPageContext(PageContext p) {
pageContext = p;
}
public void release() {
}
public Tag getParent() {
return null;
}
public int doStartTag() {
return EVAL_BODY_INCLUDE;
}
public int doAfterBody() {
System.out.println("doAfterBody()");
counter++;
result *= number;
if (counter == power)
return SKIP_BODY;
else
return EVAL_BODY_AGAIN;
}
public int doEndTag() throws JspException {
System.out.println("doEndTag()");
try {
JspWriter out = pageContext.getOut();
out.println(number + "^" + power + " = " + result);
}
catch (Exception e) {
}
return EVAL_PAGE;
}
}
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powertagdemo.jsp
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<%@ taglib uri="/mytld" prefix="easy"%>
Power Tag
Power Tag
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web.xml
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template
/mytld
/WEB-INF/mytld.tld
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mytld.tld
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1.0
1.2
myPowerTag
de.th.web.PowerTag
number
true
power
true