今天忙了一天,主要是考虑如何把验证码图片和加密的字符串一同返回，由于上司要求不能用状态来在页面直接传递值，所以只好用异步的了。
验证码的引用页面
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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" src="js/jquery-1.2.6.js"></script>
<script language="javascript" type="text/javascript">
function change()
{
var img = document.getElementById("Image1");
//var txt=img.getElementById("Text1");
img.src = img.src + '?';
$("#md5").load("ValiateCode.aspx", {id:"md5"});
}
function firstload() {
$("#md5").load("ValiateCode.aspx", { id: "md5" });
}
function test() {
var hid1 = document.getElementById("hid1");
if (hid1.value == "0") {
//如果是第一次加载，则操作
$("#md5").load("ValiateCode.aspx", { id: "md5" });
}
else {
//否则不动作
}
}
</script>
</head>
<body onload="test()">
<form id="form1" runat="server">
<div id="md5"></div>
<input type="hidden" id="hid1" runat="server" value="0" />
<div>
<img alt="" src="ValiateCode.aspx" id="Image1" runat="server"/><a href="javascript:change();">看不清,换一张</a>
</div>
</form>
</body>
</html>
生成验证码的页面
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ValiateCode.aspx.cs" Inherits="ValiateCode" %>
<!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>
</head>
<body>
<form id="form1" runat="server">
<div>
<div id="result" runat="server"></div>
</div>
</form>
</body>
</html>
public partial class ValiateCode : System.Web.UI.Page
{
public string VNum;
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
}
}
protected override void Render(HtmlTextWriter writer)
{
base.Render(writer);
if (Request.Form["id"] == null)
{
//这里用到session只局限于ValiateCode页面内部
VNum = this.GenerateNumber(5);
string md5String = Get_MD5_Method(VNum);
ChangeTextValue(md5String);
Session["VNum"] = VNum;
this.Validate_Code(VNum);
}
if (Request.Form["id"] != null)
{
//Response.ClearContent();//需要输出图象信息 要修改HTTP头
VNum = Session["VNum"].ToString();
Response.Write(Get_MD5_Method(VNum));
//Request.Form.Clear();
Response.End();
}
}
public string Get_MD5_Method(string strSource)
{
System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] bytResult = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(strSource));
//转换成字符串，并取9到25位15
string strResult = BitConverter.ToString(bytResult);
//转换成字符串，32位17
//string strResult = BitConverter.ToString(bytResult);
//BitConverter转换出来的字符串会在每个字符中间产生一个分隔符，需要去除掉20
//strResult = strResult.Replace("-", "");
return strResult;
}
private void ChangeTextValue(string md5String)
{
//HtmlInputControl input = (HtmlInputControl)this.FindControl("Text1");
// input.Value = md5String;
result.InnerText = md5String;
}
private static char[] constant = { '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', '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' };
public string GenerateNumber(int length)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
Random rd = new Random();
for (int i = 0; i < length; i++)
{
sb.Append(constant[rd.Next(62)]);
}
return sb.ToString();
}
private void Validate_Code(string Num)
{
int Gheight = (int)(Num.Length * 13);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(Gheight, 25);
Graphics g = Graphics.FromImage(image);
Rectangle rc = new Rectangle(0, 0, 65, 25);//定义一个矩形
g.FillRectangle(new SolidBrush(Color.LightYellow), rc);//填充矩形
g.DrawString(Num, new System.Drawing.Font("Arial", 12), new System.Drawing.SolidBrush(Color.Red), 3, 3);
//g.FillRectangle(new SolidBrush(new Point(0, 0), new Point(120, 30), Color.FromArgb(0, 0, 0, 0), Color.FromArgb(255, 255, 255, 255)), 0, 0, 120, 30);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
Response.ClearContent();//需要输出图象信息 要修改HTTP头
Response.ContentType = "image/bmp";
Response.BinaryWrite(ms.ToArray());
g.Dispose();
image.Dispose();
Response.End();
}
}
此内容由惯性聚合(RSS阅读器)自动聚合整理，仅供阅读参考。 原文来自 — 版权归原作者所有。