protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		//ZbV̕
		HttpSession session = request.getSession();
		
		//ZbVIuWFNglogino
		boolean login = false;
		if (session.getAttribute("login") != null) {
			login = (Boolean)session.getAttribute("login");
		}
		
		//ZbVIuWFNgdisplayUserNameoB
		String displayUserName = (String)session.getAttribute("displayUserName");
		
		//OCsFOCʂ
		if (!login) {
			response.sendRedirect("login.html");
		}
		
		//LbVNA
		response.setHeader("Cache-Control",
				"no-store,no-cache, must-revalidte");
		response.addHeader("Cache-Control",
				"post-check=0, pre-check=0");
		response.setHeader("Pragma", "no-cache");
		response.setDateHeader("Expires", 0);
		Date today = new Date();
		response.setDateHeader("Last-Modified", today.getTime());
		
		//o͐̃Reg^CvZbg
		response.setContentType("text/html; charset=UTF-8");
		
		//o͐oAϐoutɑ
		PrintWriter out = response.getWriter();
		
		//o͓eZbg
		out.println("<html><body>");
		out.println("Login: <b>" + displayUserName + "</b>");
		out.println("<hr>");
		out.println("<a href=\"Logout\">yOAEgz</a>");
		out.println("<hr>");
		out.println("fj[<br>");
		out.println("<ul>");
		out.println("<li><a href=\"WriteMessage\">bZ[W</a>");
		out.println("<li><a href=\"ShowMessage\">bZ[Wǂ</a>");
		out.println("</ul>");
		out.println("</body></html>");
		
		//o͂
		out.close();
	}