package com.cv.servlet.session.attribute;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.log4j.Logger;
/**
* Servlet implementation class ServletSessionAttributeServlet
*
* @author Chandra Vardhan
*
*/
public class ServletSessionAttributeServlet extends HttpServlet {
private static final Logger LOGGER = Logger.getLogger(ServletSessionAttributeServlet.class);
/**
* Constructor of the object.
*/
public ServletSessionAttributeServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
LOGGER.info("Entered into doGet(HttpServletRequest ,HttpServletResponse ) of ServletSessionAttributeServlet class... ");
doPost(request, response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to
* post.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
LOGGER.info("Entered into doPost(HttpServletRequest ,HttpServletResponse ) of ServletSessionAttributeServlet class... ");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
HttpSession httpSession = request.getSession();
synchronized (httpSession) {
httpSession.setAttribute("bar", "22");
LOGGER.info("httpSession.setAttribute('bar', '22')... ");
httpSession.setAttribute("foo", "42");
LOGGER.info("httpSession.setAttribute('foo', '42')... ");
try {
Thread.sleep(5000);
} catch (Exception e) {
e.printStackTrace();
}
Object barAttribute = httpSession.getAttribute("bar");
Object fooAttribute = httpSession.getAttribute("foo");
out.print("<font size=5> If you get the content in 'GREEN' color then that is correct... If you get 'RED' then that is WRONG...</font><br/>");
if("22".equalsIgnoreCase(barAttribute.toString())) {
out.print("<font color='GREEN'>The value of 'bar' attribute is : "+barAttribute+"</font><br/>");
LOGGER.info("httpSession.getAttribute('bar')..."+barAttribute);
out.print("<font color='GREEN'>The value of 'foo' attribute is : "+fooAttribute+"</font><br/>");
LOGGER.info("httpSession.getAttribute('foo')..."+fooAttribute);
} else {
out.print("<font color='RED'>The value of 'bar' attribute is : "+barAttribute+"</font><br/>");
LOGGER.info("httpSession.getAttribute('bar')..."+barAttribute);
out.print("<font color='RED'>The value of 'foo' attribute is : "+fooAttribute+"</font><br/>");
LOGGER.info("httpSession.getAttribute('foo')..."+fooAttribute);
}
}
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
} | 
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