怎样将数据存入cookie和取出cookie

怎么将数据存入cookie和取cookie
1.存入

//存cookie
@RequestMapping("/selectUsers7")
public String selectUsers7(HttpServletResponse response)
{
    Cookie cookie=new Cookie("loginUname","zhangsan");
    cookie.setPath("/");
    cookie.setMaxAge(3600);
    response.addCookie(cookie);

    return "showUsers";//转发
}

2.取出

方式1:

//取cookie
@RequestMapping("/selectUsers8")
public String selectUsers8(HttpServletRequest request)
{
     Cookie[] arr=   request.getCookies();
     if(arr!=null)
     {
           for(Cookie cookie:arr)
           {
               if(cookie.getName().equals("loginUname"))
                      System.out.println(cookie.getValue());
           }
     }
     return "showUsers";
}

方式2:

@RequestMapping("/selectUsers9")
public String selectUsers9(@CookieValue(value="loginUname") String loginUname) {

    System.out.println(loginUname);
    return "showUsers";
}