Creating Your Own Custom JSP Tags

package com.examscam.servlet.tags;

import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

import com.examscam.common.Timer;


public class TimerTag extends TagSupport {


	public int doStartTag() throws JspException {
		JspWriter out = pageContext.getOut();
		ServletRequest request = pageContext.getRequest();
		ServletResponse response = pageContext.getResponse();
		ServletContext application = pageContext.getServletContext();
		HttpSession session = pageContext.getSession();

		Timer t = (Timer)session.getAttribute("timer");
		if (t==null){
			t = new Timer();
			session.setAttribute("timer", t);
		}
		try {
			out.print("<BR/><B>Elapsed Time: </B>" + t.getElapsedTime());
			out.print("<BR/><I>Start Time: </I>" + t.getStartTime());
		} catch (IOException e) {

			e.printStackTrace();
		}
		
		return SKIP_BODY;

	}
}