JSP-cooikeとsession

需要:cooikeとsessionでそれぞれアナログログインを行います(最初のページにユーザー名を入力し、後ろのページにユーザー名を表示します).
session:
MainServlet.java

package web;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class MainServlet extends HttpServlet {

	@Override
	protected void service(
			HttpServletRequest req, 
			HttpServletResponse res)
			throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		String path = req.getServletPath();
		if("/toLogin.do".equals(path)) {
			toLogin(req,res);
		} else if("/login.do".equals(path)) {
			login(req,res);
		}
	}

	private void toLogin(
			HttpServletRequest req, 
			HttpServletResponse res) throws ServletException, IOException {
		req.getRequestDispatcher("WEB-INF/login.jsp")
			.forward(req, res);
	}

	private void login(
			HttpServletRequest req, 
			HttpServletResponse res) throws ServletException, IOException {
		HttpSession hs = req.getSession();
		hs.setAttribute("userCode", req.getParameter("userCode"));
		req.getRequestDispatcher("WEB-INF/index.jsp")
			.forward(req, res);
	}

}

login.jsp

	
		
		
	
	
		

			

				
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index.jsp

  
       
    
  
  
    
 ！${userCode }。
  

cookie:
MainServlet.java

package web;

import java.io.IOException;
import java.net.URLEncoder;

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 MainServlet extends HttpServlet {

	@Override
	protected void service(
			HttpServletRequest req, 
			HttpServletResponse res)
			throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		String path = req.getServletPath();
		if("/toLogin.do".equals(path)) {
			toLogin(req,res);
		} else if("/login.do".equals(path)) {
			login(req,res);
		}
	}

	private void toLogin(
			HttpServletRequest req, 
			HttpServletResponse res) throws ServletException, IOException {
		req.getRequestDispatcher("WEB-INF/login.jsp")
			.forward(req, res);
	}

	private void login(
			HttpServletRequest req, 
			HttpServletResponse res) throws ServletException, IOException {
		Cookie c = new Cookie("userCode",
				URLEncoder.encode(req.getParameter("userCode"),"utf-8"));
		res.addCookie(c);		// response cookie， cookie 
								//（session ）
		req.getRequestDispatcher("WEB-INF/index.jsp")
			.forward(req, res);
	}

}

login.jspは上と同じです
index.jsp

  
       
    
  
  
    
 ！${cookie.userCode.value }。