跪求高手解决，为啥不能创建cookies,不胜感激

为啥不能创建cookies啊，浏览器没问题，代码也没问题啊，而且代码执行两次
以下是运行结果：
nullcookies
sunshiwu66Fri Apr 06 11:37:09 CST 2012
1234Fri Apr 06 11:37:09 CST 2012
[Ljavax.servlet.http.Cookie;@1a6b16f创建Fri Apr 06 11:37:09 CST 2012
sunshiwu66Fri Apr 06 11:37:09 CST 2012
1234Fri Apr 06 11:37:09 CST 2012
[Ljavax.servlet.http.Cookie;@114a947创建Fri Apr 06 11:37:09 CST 2012
以下是代码：
package com.supershopping.sunshiwu.servlet;import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
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 com.supershopping.sunshiwu.daoImpl.UserOperateImpl;
import com.supershopping.sunshiwu.po.Userinfo;public class AutoLogin extends HttpServlet {
/**
 * 
 */
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);

}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html");
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
Userinfo ui=new Userinfo();
UserOperateImpl io=new UserOperateImpl();
String username=request.getParameter("username");
String userpass=request.getParameter("userpass");
System.out.println(username+new Date());
System.out.println(userpass+new Date());
if(!username.equals(null)&&!"".equals(username)){
if(!userpass.equals(null)&&!"".equals(userpass)){
ui.setUsername(username);
ui.setUserpass(userpass);
if(io.queryconfirm(ui)){
int seconds=24*60*60;
                    Cookie cookie = new Cookie("user", username+"=="+userpass);
                    cookie.setMaxAge(seconds);                                        
                    response.addCookie(cookie);
                    Cookie[] cookies = request.getCookies();
                 System.out.println(cookies+"创建"+new Date());
                    request.getSession().setAttribute("user", username);
                   request.getRequestDispatcher("Toindex").forward(request, response);
}
}
}
out.flush();
out.close();
}}