image.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing.Imaging;
using System.IO;
using System.Drawing;
public partial class image : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string tmp = RndNum(4);
Session["yanzheng"] = tmp;
this.ValidateCode(tmp);
}
private void ValidateCode(string VNum)
{
Bitmap Img = null;
Graphics g = null;
MemoryStream ms = null;
int gheight = VNum.Length * 12;
Img = new Bitmap(gheight, 25);
g = Graphics.FromImage(Img);
//背景颜色
g.Clear(Color.White);
//文字字体
Font f = new Font("Arial Black", 10);
//文字颜色
SolidBrush s = new SolidBrush(Color.Black);
g.DrawString(VNum, f, s, 3, 3);
ms = new MemoryStream();
Img.Save(ms, ImageFormat.Jpeg);
Response.ClearContent();
Response.ContentType = "image/Jpeg";
Response.BinaryWrite(ms.ToArray());
g.Dispose();
Img.Dispose();
Response.End();
}
private string RndNum(int VcodeNum)
{
string Vchar = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p" +
",q,r,s,t,u,v,w,x,y,z";
string[] VcArray = Vchar.Split(new Char[] { ',' });
string VNum = "";
int temp = -1;
Random rand = new Random();
for (int i = 1; i < VcodeNum + 1; i++)
{
if (temp != -1)
{
rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
}
int t = rand.Next(35);
if (temp != -1 && temp == t)
{
return RndNum(VcodeNum);
}
temp = t;
VNum += VcArray[t];
}
return VNum;
}
}
login.aspx:
<%@ Page Language="C#" Debug="true" AutoEventWireup="true" CodeFile="login.aspx.cs" Inherits="login" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
<script language="JavaScript" type="text/javascript">
<!--
function CheckForm(thisform)
{
if(thisform.T_name.value=="") {
thisform.T_name.focus();
thisform.T_name.select();
alert("请输入用户名!");
return false;
}
if(thisform.T_pwd.value=="") {
thisform.T_pwd.focus();
thisform.T_pwd.select();
alert("请输入密码!");
return false;
}
if(thisform.T_yz.value=="") {
thisform.T_yz.focus();
thisform.T_yz.select();
alert("请输入验证图片!");
return false;
}
}
--->
</script>
</head>
<body onkeydown="if(event.keyCode==13){ event.keyCode=8; document.getElementById('Button1').click();}">
<form action="login.aspx" runat="server" method="post" name="thisform" id="thisform" onsubmit="return CheckForm(this);">
<div align="center">
<table width="50%" border="0" cellspacing="0">
<tr>
<td height="30" colspan="2"><div align="center">用户登陆</div></td>
</tr>
<tr>
<td width="50%" align="right">帐号：</td>
<td height="25" align="left"><label>
<input type="text" name="T_name" />
</label></td>
</tr>
<tr>
<td align="right">密码：</td>
<td height="25" align="left"><label>
<input type="password" name="T_pwd" size="21" />
</label></td>
</tr>
<tr>
<td align="right">验证图片：</td>
<td height="25" align="left"><label>
<input name="T_yz" type="text" size="8" />
<asp:ImageButton ID="ImageButton1" runat="server" /></label></td>
</tr>
<tr>
<td height="25" colspan="2" align="center"><label>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click1" Text="确 定" /> </label></td>
</tr>
</table>
</div>
</form>
</body>
</html>
login.aspx.cs:
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class login : System.Web.UI.Page
{
string str_yzma, T_yz, T_name, T_pwd, S_tr;
SqlConnection Scon;
SqlCommand Scmd;
protected void Page_Load(object sender, EventArgs e)
{
ImageButton1.ImageUrl = "image.aspx";
if (IsPostBack)
{
str_yzma = Session["yanzheng"].ToString();
T_yz = Request.Form.Get("T_yz").ToString();
T_name = Request.Form.Get("T_name").ToString();
T_pwd = Request.Form.Get("T_pwd").ToString();
}
}
protected void Button1_Click1(object sender, EventArgs e)
{
//str_yzma = Session["yanzheng"].ToString();
//T_yz = Request.Form.Get("T_yz").ToString();
//T_name = Request.Form.Get("T_name").ToString();
//T_pwd = Request.Form.Get("T_pwd").ToString();
if (str_yzma != T_yz)
{
Response.Write("<script>alert('验证码错误！');</script>");
}
else
{
S_tr = "select * from Fzfs_user where U_name = '" + T_name + "' and U_pwd ='" + T_pwd + "'";
Scon = new SqlConnection(ConfigurationSettings.AppSettings["dsn"]);
Scmd = new SqlCommand(S_tr, Scon);
Scmd.Connection.Open();
SqlDataReader Rd = Scmd.ExecuteReader();
if (Rd.Read())
{
Response.Write("<script> alert('恭喜～！你登录成功')</script>");
Rd.Close();
Scon.Close();
}
else
{
Response.Write("<script> alert('帐号/密码错误')</script>");
}
}
}
}
config 自己修改
