ASP.NET MVC使用Authorize过滤器验证用户登录

落日映苍穹つ 2021-09-17 02:48 359阅读 0赞

ASP.NET MVC使用Authorize过滤器验证用户登录。Authorize过滤器首先运行在任何其它过滤器或动作方法之前，主要用来做登录验证或者权限验证。

**示例：**使用Authorize过滤器实现简单的用户登录验证。

**1、创建登录控制器LoginController**

/// <summary>
    /// 登录控制器
    /// </summary>
    [AllowAnonymous]
    public class LoginController : Controller
    {
        /// <summary>
        /// 登录页面
        /// </summary>
        public ActionResult Index()
        {
            return View();
        }
    
        /// <summary>
        /// 登录
        /// </summary>
        [HttpPost]
        public ActionResult Login(string loginName, string loginPwd)
        {
            if (loginName == "admin" && loginPwd == "123456")
            {
                //登录成功
                Session["LoginName"] = loginName;
                return RedirectToAction("Index", "Home");
            }
            else
            {
                //登录失败
                return RedirectToAction("Index", "Login");
            }
        }
    
        /// <summary>
        /// 注销
        /// </summary>
        public ActionResult Logout()
        {
            Session.Abandon();
            return RedirectToAction("Index", "Login");
        }
    }

注意：在登录控制器LoginController上添加AllowAnonymous特性，该特性用于标记在授权期间要跳过AuthorizeAttribute的控制器和操作。

**2、创建登录页面**

@{
        ViewBag.Title = "登录页面";
        Layout = null;
    }
    
    <h2>登录页面</h2>
    
    <form action='@Url.Action("Login","Login")' id="form1" method="post">
        用户：<input type="text" name="loginName" /><br />
        密码：<input type="password" name="loginPwd" /><br />
        <input type="submit" value="登录">
    </form>

效果图：

![20181127102721970.png][]

**3、创建主页控制器LoginController**

public class HomeController : Controller
    {
        public ActionResult Index()
        {
            //获取当前登录用户
            string loginName = Session["LoginName"].ToString();
            ViewBag.Message = "当前登录用户：" + loginName;
            return View();
        }
    }

**4、创建主页页面**

@{
        ViewBag.Title = "Index";
        Layout = null;
    }
    
    <h2>Index</h2>
    <h3>@ViewBag.Message</h3>
    <a href="@Url.Action("Logout","Login")">注销</a>

效果图：

![20181127102925180.png][]

**5、创建授权过滤器LoginAuthorizeAttribute类**

创建Filter目录，在该目录下创建授权过滤器LoginAuthorizeAttribute类，继承AuthorizeAttribute。

using System.Web.Mvc;
    
    namespace MvcApp.Filter
    {
        /// <summary>
        /// 授权过滤器
        /// </summary>
        public class LoginAuthorizeAttribute : AuthorizeAttribute
        {
            public override void OnAuthorization(AuthorizationContext filterContext)
            {
                //判断是否跳过授权过滤器
                if (filterContext.ActionDescriptor.IsDefined(typeof(AllowAnonymousAttribute), true)
                   || filterContext.ActionDescriptor.ControllerDescriptor.IsDefined(typeof(AllowAnonymousAttribute), true))
                {
                    return;
                }
    
                //判断登录情况
                if (filterContext.HttpContext.Session["LoginName"] == null || filterContext.HttpContext.Session["LoginName"].ToString()=="")
                {
                    //HttpContext.Current.Response.Write("认证不通过");
                    //HttpContext.Current.Response.End();
    
                    filterContext.Result = new RedirectResult("/Login/Index");
                }
            }
        }
    }

通常Authorize过滤器也是在全局过滤器上面的，在App\_Start目录下的FilterConfig类的RegisterGlobalFilters方法中添加：

using System.Web;
    using System.Web.Mvc;
    using MvcApp.Filter;
    
    namespace MvcApp
    {
        public class FilterConfig
        {
            public static void RegisterGlobalFilters(GlobalFilterCollection filters)
            {
                filters.Add(new HandleErrorAttribute());
    
                //添加全局授权过滤器
                filters.Add(new LoginAuthorizeAttribute());
            }
        }
    }

Global.asax下的代码：

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.Mvc;
    using System.Web.Optimization;
    using System.Web.Routing;
    
    namespace MvcApp
    {
        public class MvcApplication : System.Web.HttpApplication
        {
            protected void Application_Start()
            {
                AreaRegistration.RegisterAllAreas();
                FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
                RouteConfig.RegisterRoutes(RouteTable.Routes);
                BundleConfig.RegisterBundles(BundleTable.Bundles);
            }
        }
    }

[20181127102721970.png]: /images/20210724/b563dee939a54de88a53d515fcada6f7.png
[20181127102925180.png]: /images/20210724/e59d5972c9a0415989584f6b0799d163.png