package com.tag;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.tagext.TagSupport;

public class EvalBodyTag extends TagSupport {

    private boolean show;

    public void setShow(boolean show){

        this.show = show;

    }

    public int doStartTag() throws JspException {

        // TODO Auto-generated method stub

        if(show==true)

            return super.EVAL_BODY_INCLUDE;

        else

            return super.SKIP_BODY;

    }

}

package com.tag;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.tagext.TagSupport;

public class ShowPageTag extends TagSupport {

    private boolean show;

    public void setShow(boolean show){

        this.show = show;

    }

    @Override

    public int doEndTag() throws JspException {

        System.out.println(show);

        if(show==true)

            return super.EVAL_PAGE;

        else

            return super.SKIP_PAGE;

    }

    @Override

    public int doStartTag() throws JspException {

        return super.EVAL_BODY_INCLUDE;

    }

}

package com.tag;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.tagext.IterationTag;

import javax.servlet.jsp.tagext.Tag;

import javax.servlet.jsp.tagext.TagSupport;

public class RepeatTag extends TagSupport{

    private int count;

    public void setCount(int count){

        this.count = count;

    }

    public int doAfterBody() throws JspException {

        count--;

        if(count>0)

            return RepeatTag.EVAL_BODY_AGAIN;

        else

            return RepeatTag.SKIP_BODY;

    }

    public int doStartTag() throws JspException {

        return Tag.EVAL_BODY_INCLUDE;

    }

}

package com.tag;

import java.io.IOException;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.tagext.BodyContent;

import javax.servlet.jsp.tagext.BodyTagSupport;

public class BodyContentTag extends BodyTagSupport {

    @Override

    public int doEndTag() throws JspException {

        BodyContent body = this.getBodyContent();

        String bc = body.getString();

        bc = bc.toUpperCase();

        try {

            this.pageContext.getOut().write(bc);

        } catch (IOException e) {

            e.printStackTrace();

            throw new RuntimeException(e);

        }

        return super.doStartTag();

    }

    @Override

    public int doStartTag() throws JspException {

        return super.EVAL_BODY_BUFFERED;

    }

}

<?xml version="1.0" encoding="UTF-8" ?>

<taglib xmlns="http://java.sun.com/xml/ns/j2ee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"

    version="2.0">

    <description>A tag library exercising SimpleTag handlers.</description>

    <tlib-version>1.0</tlib-version>

    <short-name>SimpleTagLibrary</short-name>

    <uri>http://self-tag-with-hello</uri>

    <tag>

        <name>helloWorld</name>

        <tag-class>com.tag.HelloWorldTag</tag-class>

        <body-content>empty</body-content>

          <attribute>

                <name>name</name>

                <required>true</required>

                <rtexprvalue>true</rtexprvalue>

          </attribute>

    </tag>

    <tag>

        <name>evalbody</name>

        <tag-class>com.tag.EvalBodyTag</tag-class>

        <body-content>JSP</body-content>

        <attribute>

            <name>show</name>

            <required>true</required>

        </attribute>

    </tag>

    <tag>

        <name>showpage</name>

        <tag-class>com.tag.ShowPageTag</tag-class>

        <body-content>JSP</body-content>

        <attribute>

            <name>show</name>

            <required>true</required>

        </attribute>

    </tag>

      <tag>

        <name>repeatbody</name>

        <tag-class>com.tag.RepeatTag</tag-class>

        <body-content>JSP</body-content>

        <attribute>

            <name>count</name>

            <required>true</required>

        </attribute>

    </tag>

      <tag>

        <name>changeContent</name>

        <tag-class>com.tag.BodyContentTag</tag-class>

        <body-content>JSP</body-content>

    </tag>

</taglib>