c#通用登录模块分享

// 举个例子：一个网站有用户系统、商家系统、网站后台3个系统
//可以分3个userType, user ,shop , system
//网站后台一般都有角色，如admin,employee
//那么网站的角色就有 user,shop,admin,employee,但是admin和employee在一个客户端是不能同时登陆的，所以他们是同一类用户（system）

使用方法：

1、添加一个类LoginUser.cs 代码如下：

代码：

namespace MVCCommonAuth
{
  #region 功能说明
  // 举个例子：一个网站有用户系统、商家系统、网站后台3个系统
  //可以分3个userType, user ,shop , system
  //网站后台一般都有角色，如admin,employee
  //那么网站的角色就有 user,shop,admin,employee,但是admin和employee在一个客户端是不能同时登陆的，所以他们是同一类用户（system）
  #endregion

  public enum UserType
  {
    User,
    Shop,
    System
  }

  [Serializable]
  public class LoginUser
  {
    private static string DESKEY = DateTime.Now.ToString("1234MMdd");
    public int ID { get; set; }
    public string UserName { get; set; }
    public string Roles { get; set; }
    public DateTime Expires { get; set; }

    public readonly static string cookieNamePrefix = "authcookie";

    public void Login(string userType, string domain = null, string path = null)
    {
      var keyName = cookieNamePrefix + userType;
      var json = JsonConvert.SerializeObject(this);
      var value = EncryptString(json, DESKEY);

      Httpcookie cookie = new Httpcookie(keyName, value);
      cookie.Expires = Expires;
      if (!string.IsNullOrWhiteSpace(domain))
      {
 cookie.Domain = domain;
      }
      if (path != null)
      {
 cookie.Path = path;
      }
      HttpContext.Current.Items[keyName] = this;
      HttpContext.Current.Response.cookies.Add(cookie);
    }


    /// 

    /// 从cookie读取用户信息
    /// 
    /// 
    private static LoginUser BuildUser(string keyName)
    {
      var cookie = HttpContext.Current.Request.cookies[keyName];
      if (cookie != null && !string.IsNullOrEmpty(cookie.Value))
      {
 try
 {
   var json = DecryptString(cookie.Value, DESKEY);
   var loginuser = JsonConvert.DeserializeObject(json);
   if (loginuser != null)
   {
     if (loginuser.Expires >= DateTime.Now)
     {
return loginuser;
     }
   }
 }
 catch
 {
   //do nothing
 }
      }
      return null;
    }

    public static LoginUser GetUser(string userType)
    {
      var keyName = cookieNamePrefix + userType;
      if (!HttpContext.Current.Items.Contains(keyName))
      {
 var user = BuildUser(keyName);
 HttpContext.Current.Items[keyName] = user;
 return user;
      }
      else
      {
 return HttpContext.Current.Items[keyName] as LoginUser;
      }
    }

    public static int GetUserID(string userType)
    {
      var user = GetUser(userType);
      if (user != null)
 return user.ID;
      return 0;
    }

    /// 

    /// 退出cookie登录
    /// 
    public static void Logout(string userType)
    {
      var keyName = cookieNamePrefix + userType;

      Httpcookie cookie = new Httpcookie(keyName, string.Empty);
      cookie.Expires = DateTime.Now.AddMonths(-1);
      HttpContext.Current.Response.cookies.Add(cookie);
    }


    #region 字符串加密

    /// 
  
    /// 利用DES加密算法加密字符串（可解密）  
    /// 
  
    /// 被加密的字符串  
    /// 密钥（只支持8个字节的密钥）  
    /// 加密后的字符串  
    private static string EncryptString(string plaintext, string key)
    {
      //访问数据加密标准(DES)算法的加密服务提供程序 (CSP) 版本的包装对象  
      DESCryptoServiceProvider des = new DESCryptoServiceProvider();
      des.Key = ASCIIEncoding.ASCII.GetBytes(key);　//建立加密对象的密钥和偏移量  
      des.IV = ASCIIEncoding.ASCII.GetBytes(key);　 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法  

      byte[] inputByteArray = Encoding.Default.GetBytes(plaintext);//把字符串放到byte数组中  

      MemoryStream ms = new MemoryStream();//创建其支持存储区为内存的流　  
      //定义将数据流链接到加密转换的流  
      CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
      cs.Write(inputByteArray, 0, inputByteArray.Length);
      cs.FlushFinalBlock();
      //上面已经完成了把加密后的结果放到内存中去  
      StringBuilder ret = new StringBuilder();
      foreach (byte b in ms.ToArray())
      {
 ret.AppendFormat("{0:X2}", b);
      }
      ret.ToString();
      return ret.ToString();
    }
    /// 
  
    /// 利用DES解密算法解密密文（可解密）  
    /// 
  
    /// 被解密的字符串  
    /// 密钥（只支持8个字节的密钥，同前面的加密密钥相同）  
    /// 返回被解密的字符串  
    private static string DecryptString(string ciphertext, string key)
    {
      try
      {
 DESCryptoServiceProvider des = new DESCryptoServiceProvider();

 byte[] inputByteArray = new byte[ciphertext.Length / 2];
 for (int x = 0; x < ciphertext.Length / 2; x++)
 {
   int i = (Convert.ToInt32(ciphertext.Substring(x * 2, 2), 16));
   inputByteArray[x] = (byte)i;
 }

 des.Key = ASCIIEncoding.ASCII.GetBytes(key);　//建立加密对象的密钥和偏移量，此值重要，不能修改  
 des.IV = ASCIIEncoding.ASCII.GetBytes(key);
 MemoryStream ms = new MemoryStream();
 CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

 cs.Write(inputByteArray, 0, inputByteArray.Length);

 cs.FlushFinalBlock();

 //建立StringBuild对象，createDecrypt使用的是流对象，必须把解密后的文本变成流对象  
 StringBuilder ret = new StringBuilder();

 return System.Text.Encoding.Default.GetString(ms.ToArray());
      }
      catch (Exception)
      {
 return "error";
      }
    }

    #endregion
  }
}

2、登录处理过程，写入cookie：

    [HttpPost]
    public ActionResult Login(string username,string userpass)
    {
      if (username=="admin" && userpass=="admin")
      {
 LoginUser loginuser = new LoginUser();
 loginuser.ID = 1;
 loginuser.UserName = username;
 loginuser.Roles = "Administrator";
 loginuser.Expires = DateTime.Now.AddHours(2);

 loginuser.Login("Administrator");

 return Content("登录成功");
 //return RedirectToAction("Index", "Home");
      }

      return RedirectToAction("Login");
    }

3、判断用户是否登录：

//是否登录
if(LoginUser.GetUserID("Administrator") > 0)
{

}
// 用户ID
int userID=LoginUser.GetUserID("Administrator")

//获取用户名
string userName= LoginUser.GetUser("Administrator").UserName

再来分享一个示例

1.HTML部分：
 

2.引入登录插件：login.js

(function ($) {
  $.fn.login = function (option) {
    var defaults = {
      url: '/account/login/',
      msg: $(this).find('.msg'),
      userName: $(this).find("input[name='userName']"),
      password: $(this).find("input[name='password']"),
      button: $(this).find("#button")
    };
    var options = $.extend(defaults, option);
    var errMsg = {
      'inputUserName': '请输入用户名',
      'inputPassword': '请填写登录密码',
      'passwordLength': '密码应在6-32位字符内',
      'noreg': '此账号未注册',
      'inviladUserName': '帐号不存在',
      'accountNotMatch': '账号密码不匹配',
      'userLocked': '帐号锁定中，暂时无法登录',
      'serverdown': '服务器繁忙，请稍后再试'
    };
    //提交数据
    function submit() {
      var userNameInput = $.trim(options.userName.val());
      var passwordInput = $.trim(options.password.val());
      if (userNameInput == '') {
 showMsg('登录名不能为空');
 options.userName.focus();
 return;
      }
      if (passwordInput == '') {
 showMsg('密码不能为空');
 options.password.focus();
 return;
      }
      $.ajax({
 type: "POST",
 url: options.url,
 data: "userName=" + userNameInput + "&password=" + passwordInput,
 success: function (msg) {
   var result = eval("[" + msg + "]")[0];
   if (result.status == "ok") {
     //登录成功处理
     showMsg("登录成功....");
   } else {
     showMsg(errMsg[result.status]);
   }
 }
      });
    }
    //显示错误信息
    function showMsg(msg) {
      options.msg.html(msg);
    }
    //绑定按钮事件
    options.button.bind('click', function () {
      submit();
      return false;
    });
  };
})(jQuery);

3.页面调用插件：

4.后台处理逻辑（请根据实际需求做相应调整）

using System;
using System.Web;
using System.Web.UI;
namespace Whir.SiteFactory.Website.Admin.Account
{
  public partial class AjaxLogin : Page
  {
    protected void Page_Load(object sender, EventArgs e)
    {
      string status = ProcessLogin();
      Response.Clear();
      Response.Write(status);
      Response.End();
    }
    private string ProcessLogin()
    {
      try
      {
 string userName = HttpContext.Current.Request.Form["userName"];
 string password = HttpContext.Current.Request.Form["password"];
 if (string.IsNullOrEmpty(userName))
 {
   return "{status:'inputUserName'}"; //请输入用户名
 }
 if (string.IsNullOrEmpty(password))
 {
   return "{status:'inputPassword'}"; //请填写登录密码
 }
 if (password.Length < 6 || password.Length > 32)
 {
   return "{status:'passwordLength'}"; //密码应在6-32位字符内
 }
 //var user = UserService.GetUserByName(userName);
 //if (user == null)
 //{
 //  return "{status:'inviladUserName'}"; //帐号不存在
 //}
 //if (user.IsLocked)
 //{
 //  return "{status:'userLocked'}"; //帐号锁定中，暂时无法登录
 //}
 //if (user.Password.ToLower() != password.ToMd5().ToLower())
 //{ 
 //  return "{accountNotMatch:'ok'}"; //账号密码不匹配
 //}
 //其他操作：
 //写入客户端cookie
 //登录日志
 return "{status:'ok'}"; //登录成功
      }
      catch (Exception ex)
      {
 return "{status:'serverdown'}"; //服务器繁忙，请稍后再试
      }
    }
  }
}