.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

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>`

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

加载中...

3、三种实现方式

1. Form表单形式

    <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

<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

<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：

加载中... 编程序一定要先有思路，在思路的引导下，细心再细心