Ajax+asp.net实现用户登陆

时间：2021-05-28

以用户登录为例练习ajax的使用方法

login.html

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <script type="text/javascript"> var obj = createobj(); function login(name, pwd) { var urlstr = "http://localhost:14248/server.aspx?username=" + name + "&password=" + pwd; obj.open("get", urlstr, true); obj.onreadystatechange = dowork; obj.send(); } function dowork() { if (obj.readyState == 4) { if (obj.status == 200) { document.getElementById("msg").innerText = obj.responseText; } } } //创建对象 function createobj() { var xmlHttp = null; try { //非IE浏览器 xmlHttp = new XMLHttpRequest(); } catch (e) { //IE浏览器 try{ xmlHttp = new ActiveXObject("Msxml2.HTTP"); } catch (e) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } } return xmlHttp; } </script></head><body> <table> <tr> <td align="center" colspan="2">登录</td> </tr> <tr> <td>用户名：</td> <td><input type="text" id="username" name="username" /></td> </tr> <tr> <td>密码：</td> <td><input type="password" id="password" name="password" /></td> </tr> <tr> <td > <input type="submit" value="登录" onclick="login(document.getElementById('username').value,document.getElementById('password').value)" /> </td> <td> <input type="reset" value="清空" /> </td> <td><span id="msg"></span></td> </tr> </table></body></html>

DAL.cs

using System;using System.Collections.Generic;using System.Data;using System.Data.SqlClient;using System.Linq;using System.Web; namespace AJAXtest{ public class DAL { private string connstr = "server=acer-pc;database=mydatabase;user id=sa;password=123456"; public DataTable selectDB(string sql) { DataTable dt = new DataTable(); try { SqlConnection conn = new SqlConnection(connstr); SqlDataAdapter sda = new SqlDataAdapter(sql, conn); sda.Fill(dt); } catch(Exception e) {} return dt; } }}

BLL.cs

using System;using System.Collections.Generic;using System.Data;using System.Linq;using System.Web; namespace AJAXtest{ public class BLL { public bool login(string username,string password) { try { string sql = "select password from Users where username='" + username + "'"; DAL sqlSelect = new DAL(); DataTable dt = sqlSelect.selectDB(sql); if (dt.Rows[0]["password"].ToString() != password) return false; } catch (Exception) { } return true; } }}

Server.aspx.cs

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls; namespace AJAXtest{ public partial class Server : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string username = Request["username"].ToString(); string password = Request["password"].ToString(); BLL b = new BLL(); if (b.login(username, password)) { Response.Write("登录成功"); Response.End(); } else { Response.Write("登录失败"); Response.End(); } } }}

Server.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Server.aspx.cs" Inherits="AJAXtest.Server" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title></head><body> <form id="form1" runat="server"> <div> </div> </form></body></html>

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