import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class AutoServlet3 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
//client browser will request the page according to user choice
Cookie refresh = null;
Cookie viewingTimes = null;
for(Cookie c : request.getCookies()) {
if (c.getName().equals("refresh")) {
refresh = c;
}
if (c.getName().equals("viewingTimes")) {
viewingTimes = c;
}
}
if(refresh == null){
refresh = new Cookie("refresh","5");
response.addCookie(refresh);
}
if(viewingTimes == null){
viewingTimes = new Cookie("viewingTimes","1");
viewingTimes.setMaxAge(60);
response.addCookie(viewingTimes);
}
String refreshRate = request.getParameter("refreshRate");
if(refreshRate != null){
refresh.setValue(refreshRate);
response.addCookie(refresh);
}
response.addHeader("Refresh", refresh.getValue());
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
out.println("Client Refresh");
out.println("This page is automatically refreshed every "+refresh.getValue()+" seconds");
out.print("
");
//More HTML or dynamic content
out.println("This page has been refreshed " + viewingTimes.getValue() + " times.");
int tmp = new Integer(viewingTimes.getValue());
out.println("");
viewingTimes.setValue(""+(++tmp));
response.addCookie(viewingTimes);
} //end doGet
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
}