asp.net cookies的简单应用-记住用户

时间:2011-12-27 23:31来源: 作者:admin 点击: 次

在我们开发网站或者论坛的时候，我们经常遇到需要记住用户等一些功能，现总结如下：

正文

CookiesHelper.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;

namespace TLibrary.ObjectHelper
{
    public class CookiesHelper
    {

        #region 获取Cookie

        /// <summary>
        /// 获得Cookie的值
        /// </summary>
        /// <param name="cookieName"></param>
        /// <returns></returns>
        public static string GetCookieValue(string cookieName)
        {
            return GetCookieValue(cookieName, null);
        }

        /// <summary>
        /// 获得Cookie的值
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string GetCookieValue(string cookieName,string key)
        {
            HttpRequest request = HttpContext.Current.Request;
            if (request != null)
                return GetCookieValue(request.Cookies[cookieName], key);
            return "";
        }

        /// <summary>
        /// 获得Cookie的子键值
        /// </summary>
        /// <param name="cookie"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string GetCookieValue(HttpCookie cookie, string key)
        {
            if (cookie != null)
            {
                if (!string.IsNullOrEmpty(key) && cookie.HasKeys)
                    return cookie.Values[key];
                else
                    return cookie.Value;
            }
            return "";
        }

        /// <summary>
        /// 获得Cookie
        /// </summary>
        /// <param name="cookieName"></param>
        /// <returns></returns>
        public static HttpCookie GetCookie(string cookieName)
        {
            HttpRequest request = HttpContext.Current.Request;
            if (request != null)
                return request.Cookies[cookieName];
            return null;
        }

        #endregion

        #region 删除Cookie

        /// <summary>
        /// 删除Cookie
        /// </summary>
        /// <param name="cookieName"></param>
        public static void RemoveCookie(string cookieName)
        {
            RemoveCookie(cookieName,null);
        }

        /// <summary>
        /// 删除Cookie的子键
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="key"></param>
        public static void RemoveCookie(string cookieName,string key)
        {
            HttpResponse response = HttpContext.Current.Response;
            if (response != null)
            {
                HttpCookie cookie = response.Cookies[cookieName];
                if (cookie != null)
                {
                    if (!string.IsNullOrEmpty(key) && cookie.HasKeys)
                        cookie.Values.Remove(key);
                    else
                        response.Cookies.Remove(cookieName);
                }
            }
        }

        #endregion

        #region 设置/修改Cookie

        /// <summary>
        /// 设置Cookie子键的值
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SetCookie(string cookieName, string key, string value)
        {
            SetCookie(cookieName, key, value, null);
        }

        /// <summary>
        /// 设置Cookie值
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SetCookie(string key, string value)
        {
            SetCookie(key, null, value, null);
        }

        /// <summary>
        /// 设置Cookie值和过期时间
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <param name="expires"></param>
        public static void SetCookie(string key, string value, DateTime expires)
        {
            SetCookie(key, null, value, expires);
        }

        /// <summary>
        /// 设置Cookie过期时间
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="expires"></param>
        public static void SetCookie(string cookieName, DateTime expires)
        {
            SetCookie(cookieName, null, null, expires);
        }

        /// <summary>
        /// 设置Cookie
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <param name="expires"></param>
        public static void SetCookie(string cookieName, string key, string value, DateTime? expires)
        {
            HttpResponse response = HttpContext.Current.Response;
            if (response != null)
            {
                HttpCookie cookie = response.Cookies[cookieName];
                if (cookie != null)
                {
                    if (!string.IsNullOrEmpty(key) && cookie.HasKeys)
                        cookie.Values.Set(key, value);
                    else
                        if (!string.IsNullOrEmpty(value))
                            cookie.Value = value;
                    if (expires != null)
                        cookie.Expires = expires.Value;
                    response.SetCookie(cookie);
                }
            }

        }

        #endregion

        #region 添加Cookie

        /// <summary>
        /// 添加Cookie
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void AddCookie(string key, string value)
        {
            AddCookie(new HttpCookie(key, value));
        }

        /// <summary>
        /// 添加Cookie
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <param name="expires"></param>
        public static void AddCookie(string key, string value, DateTime expires)
        {
            HttpCookie cookie = new HttpCookie(key, value);
            cookie.Expires = expires;
            AddCookie(cookie);
        }

        /// <summary>
        /// 添加为Cookie.Values集合
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void AddCookie(string cookieName,string key, string value)
        {
            HttpCookie cookie = new HttpCookie(cookieName);
            cookie.Values.Add(key, value);
            AddCookie(cookie);
        }

        /// <summary>
        /// 添加为Cookie集合
        /// </summary>
        /// <param name="cookieName">Cookie名称</param>
        /// <param name="expires">过期时间</param>
        public static void AddCookie(string cookieName, DateTime expires)
        {
            HttpCookie cookie = new HttpCookie(cookieName);
            cookie.Expires = expires;
            AddCookie(cookie);
        }

        /// <summary>
        /// 添加为Cookie.Values集合
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <param name="expires"></param>
        public static void AddCookie(string cookieName, string key, string value, DateTime expires)
        {
            HttpCookie cookie = new HttpCookie(cookieName);
            cookie.Expires = expires;
            cookie.Values.Add(key, value);
            AddCookie(cookie);
        }

        /// <summary>
        /// 添加Cookie
        /// </summary>
        /// <param name="cookie"></param>
        public static void AddCookie(HttpCookie cookie)
        {
            HttpResponse response = HttpContext.Current.Response;
            if (response != null)
            {
                //指定客户端脚本是否可以访问[默认为false]
                cookie.HttpOnly = true;
                //指定统一的Path，比便能通存通取
                cookie.Path = "/";
                //设置跨域,这样在其它二级域名下就都可以访问到了
                //cookie.Domain = "chinesecoo.com";
                response.AppendCookie(cookie);
            }
        }

        #endregion
    }
}

代码注意事项:

1. Cookies添加的时候注意一个Cookie可以添加多个子键

2. 假如你不显示的设置 HttpCookie.Expires 那么此 cookie 生命期即为浏览器进程——关闭浏览器则过期

3. 需要了解HttpCookie.Domain和HttpCookie.Path这两个属性，对于跨域和存储路径等高级应用有帮助

以下看实际调用代码

页面加载

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            HttpCookie Cookie = CookiesHelper.GetCookie("UserInfo");
            if (Cookie != null)
            {
                this.txtUserName.Value = Cookie.Values["uName"];
            }
        }
    }

代码说明：

1. this.txtUserName是界面上输入用户名的控件，换成自己的控件名称就行；

2. UserInfo为Cookie的名称，uName为Cookie的子键。

这段代码的功能是在页面加载的时候显示用户Cookie中记录的用户名，这里也可以做成连密码一起记录然后在这里显示，这样用户就可以直接点登录按钮了

登录验证

        string uName = this.txtUserName.Value.Trim();

        //验证用户名密码
        if (IsLogin(uName, this.txtPass.Value.Trim()))
        {
            //记住我的名字
            if (!string.IsNullOrEmpty(Request["remUsername"]))
            {
                HttpCookie Cookie = CookiesHelper.GetCookie("UserInfo");
                if (Cookie == null)
                {
                    Cookie = new HttpCookie("UserInfo");
                    Cookie.Values.Add("uName", uName);
                    //设置Cookie过期时间
                    Cookie.Expires = DateTime.Now.AddDays(365);
                    CookiesHelper.AddCookie(Cookie);
                }
                else if (!Cookie.Values["uName"].Equals(uName))
                    CookiesHelper.SetCookie("UserInfo", "uName", uName);
            }
            Response.Redirect("~/index.aspx");
        }

代码说明：

1. this.txtUserName和this.txtPass是界面上输入用户名和密码的控件，换成自己的控件名称就行；

2. IsLogin方法是用来验证用户名和密码是否正确的，这里替换成自己的验证方法就行了。

3. Request["remUsername"]是获得界面上是否选中了[记住我的名称]复选框

这段代码的功能是在用户登录成功之后，如果选中了记住登录用户名就把用户名存入客户端的Cookie中，并设置过期时间为1年。

补充

1. 根据实际的经验，一般的情况下在本地调试不设置Domain属性，挂上服务器上配上域名之后就得指定Domain参数了，否则Cookies出不来的。

(责任编辑：admin)

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asp.net cookies的简单应用-记住用户

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