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package org.javaee7.servlet.event.listeners;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @author Arun Gupta
*/
@WebServlet(urlPatterns = "/TestServlet")
public class TestServlet extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet Event Listeners</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet Event Listeners</h1>");
out.println("<h2>Setting, updating, and removing ServletContext Attributes</h2>");
request.getServletContext().setAttribute("attribute1", "attribute-value1");
request.getServletContext().setAttribute("attribute1", "attribute-updated-value1");
request.getServletContext().removeAttribute("attribute1");
out.println("done");
out.println("<h2>Setting, updating, and removing HttpSession Attributes</h2>");
request.getSession(true).setAttribute("attribute1", "attribute-value1");
request.getSession().setAttribute("attribute1", "attribute-updated-value1");
request.getSession().removeAttribute("attribute1");
out.println("done");
out.println("<h2>Setting, updating, and removing ServletRequest Attributes</h2>");
request.setAttribute("attribute1", "attribute-value1");
request.setAttribute("attribute1", "attribute-updated-value1");
request.removeAttribute("attribute1");
out.println("done");
out.println("<h2>Invalidating session</h2>");
request.getSession().invalidate();
out.println("done");
out.println("<br><br>Check output in server log");
out.println("</body>");
out.println("</html>");
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}