.net中的一般处理程序实例

最近在学习一般处理程序，也学习了一些jQuery的异步操作，于是就想着亲手做一个小的登陆，锻炼一下自己。

1、首先新建了一个项目LoginDemo,在此基础上又添加了一个一般处理程序BackLogin.ashx,具体代码如下

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1	///<span style="font-family: Arial, Helvetica, sans-serif;" class="">没有牵扯到数据库查询，在这写的比较简单</span>

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public class BackLogin : IHttpHandler     {           public void ProcessRequest(HttpContext context)         {             context.Response.ContentType = "text/plain";             string username = context.Request.Form["username"];             string password = context.Request.Form["password"];             if (username == " " || password == " ")             {                 context.Response.Write("请填写用户名或密码！");             }             else             {                 if (username == "001" && password == "001")                   {                     context.Response.Write("success");                 }                 else                 {                     context.Response.Write("用户名或密码错误，请重新登录！");                 }             }             context.Response.End();         }         public bool IsReusable         {             get             {                 return false;             }         }     }

2、添加一个Web页面Login.aspx,作为登陆页面，浏览器效果图如下所示

3、三种实现方式

1. Form表单形式

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<form action="BackLogin.ashx" method="post">         <input type="text" name="username" value="{num}">         <input type="text" name="password">         <input type="submit" value="登陆">     </form>

2、异步Post方式

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<script type="text/javascript">     $(function () {         $("#Login").click(function () {             $.post("BackLogin.ashx", { "username": $("#username").val(), "password": $("#password").val() },         function (msg) {             if (msg == "success") {                 alert("登陆成功");             }             else if (msg == "用户名或密码错误，请重新登录！") {                 alert("登录失败！");             }             else {                 alert("请输入用户名和密码！");             }         });         });         // $("form1").submit();     }) </script>

3、异步ajax

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<script type="text/javascript">           $(document).ready(function () {               $("#Login").click(function () {                   $.ajax({                       url: "BackLogin.ashx",                       type: "POST",                       data: "username=" + escape($('#username').val()) + "&password=" + escape($('#password').val()),                       dataType: "text/plain",                       async: "true",                       success: function (msg) {                           var data = eval("(" + msg.d + ")");                           if (data == "success") {                               alert("登陆成功！");                           }                           else {                               alert("登录失败！");                           }                       }                   });               })           });     </script>

4、运行效果

输入001,0010用户名、密码时浏览器显示如下：

编程序一定要先有思路，在思路的引导下，细心再细心