網上有很多關於驗證碼做法的資料,但是真正做得完整的卻非常少,所以昨天晚上參考了作者：CSDN 上kwklover 的在ASP.NET下實現數字和字符相混合的驗證碼 (混合,完整,遺憾的是vb.net,說到這裏我想我得感謝stone(QQ9337874),因爲我在把VB譯成C#的過程中幾番出錯,最終這段翻譯由他完成)!!
隨機漢字參考了http://navicy.cnblogs.com/archive/2005/05/08/150756.html這篇文章的,
而最終的純數字以及GDI+繪圖則是從□☆近三十☆(QQ19302038)傳給我的一個OA案例裏面分離出來的!
所以完整的說,這裏面幾乎都是別人做好了的,我只是整理出來了!
完整的下載地址是 http://www.cnblogs.com/Files/thcjp/gdi.rar
下面把代碼的重點部分貼出來，如果看源文件有什麼不明白可以問偶 ＱＱ１１０５３５８０８
效果如圖(我確實懶了點,按紐的名字都沒有改,哈哈)
需要說明的是,因爲提交對比後,頁面是重新刷新了,所以文本框裏面看見的和後面圖片顯示不一樣,這個不需要太多說明吧!!
混合模式刷新出現約界錯誤 已經被 stone(QQ9337874) 修正!!
下面是ＧＤＩ＋繪圖的代碼段，以及顯示的調用等
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.Drawing2D;using System.Drawing.Imaging;using System.Drawing.Text;using System.Drawing;using System.Text; public partial class png : System.Web.UI.Page
{
private readonly string ImagePath = "Validator.jpg"; private static string gif = ""; protected void Page_Load(object sender, EventArgs e)
{
switch (Request.QueryString["aa"]) { case "1": gif = stxt(); Session["gif"]= stxt(); break; case "2": gif = GetRandomint(); Session["gif"]= GetRandomint(); break; case "3": gif = RndNum(3); Session["gif"]= RndNum(3); break; default: gif = RndNum(3); Session["gif"]= GetRandomint(); break;
} ///創建Bmp位圖 Bitmap bitMapImage = new System.Drawing.Bitmap(Server.MapPath(ImagePath)); Graphics graphicImage = Graphics.FromImage(bitMapImage); ///設置畫筆的輸出模式 graphicImage.SmoothingMode = SmoothingMode.HighSpeed; ///添加文本字符串 graphicImage.DrawString(gif, new Font("Arial", 20, FontStyle.Bold), SystemBrushes.WindowText, new Point(0, 0)); ///設置圖像輸出的格式 Response.ContentType = "image/jpeg"; ///保存數據流 bitMapImage.Save(Response.OutputStream, ImageFormat.Jpeg); ///釋放佔用的資源 graphicImage.Dispose(); bitMapImage.Dispose(); }返回純數字
private String GetRandomint() { Random random = new Random(); return (random.Next(100000, 999999).ToString());
}
返回文字＼數字＼字母混合的
public static 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,W,X,Y,Z,呵,哈,彈,簧,秤,嬉,戲"; String[] VcArray = Vchar.Split(','); String VNum = ""; Random random = new Random(); for (int i = 1; i <= VcodeNum; i++) { int iNum = 0; while ((iNum = Convert.ToInt32(VcArray.Length * random.NextDouble())) ==VcArray.Length ) { iNum = Convert.ToInt32(VcArray.Length * random.NextDouble()); } VNum += VcArray[iNum]; // VNum += VcArray[Convert.ToInt32(VcArray.Length*random.NextDouble())]; } return VNum; } 返回漢字的
public static object[] CreateRegionCode(int strlength) { //定義一個字符串數組儲存漢字編碼的組成元素 string[] rBase=new String [16]{"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"}; Random rnd=new Random(); //定義一個object數組用來 object[] bytes=new object[strlength]; /**//*每循環一次產生一個含兩個元素的十六進制字節數組，並將其放入bject數組中 每個漢字有四個區位碼組成 區位碼第1位和區位碼第2位作爲字節數組第一個元素 區位碼第3位和區位碼第4位作爲字節數組第二個元素 */ for(int i=0;i<strlength;i++) { //區位碼第1位 int r1=rnd.Next(11,14); string str_r1=rBase[r1].Trim(); //區位碼第2位 rnd=new Random(r1*unchecked((int)DateTime.Now.Ticks)+i);//更換隨機數發生器的種子避免產生重複值 int r2; if (r1==13) { r2=rnd.Next(0,7); } else { r2=rnd.Next(0,16); } string str_r2=rBase[r2].Trim(); //區位碼第3位 rnd=new Random(r2*unchecked((int)DateTime.Now.Ticks)+i); int r3=rnd.Next(10,16); string str_r3=rBase[r3].Trim(); //區位碼第4位 rnd=new Random(r3*unchecked((int)DateTime.Now.Ticks)+i); int r4; if (r3==10) { r4=rnd.Next(1,16); } else if (r3==15) { r4=rnd.Next(0,15); } else { r4=rnd.Next(0,16); } string str_r4=rBase[r4].Trim(); //定義兩個字節變量存儲產生的隨機漢字區位碼 byte byte1=Convert.ToByte(str_r1 + str_r2,16); byte byte2=Convert.ToByte(str_r3 + str_r4,16); //將兩個字節變量存儲在字節數組中 byte[] str_r=new byte[]{byte1,byte2}; //將產生的一個漢字的字節數組放入object數組中 bytes.SetValue(str_r,i); } return bytes; } private string stxt() { Encoding gb = Encoding.GetEncoding("gb2312"); //調用函數產生4個隨機中文漢字編碼 object[] bytes = CreateRegionCode(3); //根據漢字編碼的字節數組解碼出中文漢字 string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[]))); string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[]))); string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[]))); string txt = str1 + str2 + str3; return txt; }我們調用頁的代碼如下
ＨＴＭＬ代碼
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="view.aspx.cs" Inherits="view" %><!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>無標題頁</title></head><body> <form id="form1" runat="server"> <div> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> <asp:Image ID="Image1" runat="server" ImageUrl="png.aspx" /><br /> <br /> <asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="Button" /> <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"> <asp:ListItem Value="3">默認</asp:ListItem> <asp:ListItem Value="1">文字</asp:ListItem> <asp:ListItem Value="2">數字</asp:ListItem> <asp:ListItem Value="3">混合</asp:ListItem> </asp:DropDownList></div> </form></body></html>ＣＳ代碼
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { switch (DropDownList1.SelectedValue) { case "1": Image1.ImageUrl = "png.aspx?aa=1"; break; case "2": Image1.ImageUrl = "png.aspx?aa=2"; break; case "3": Image1.ImageUrl = "png.aspx?aa=3"; break; } } protected void Button2_Click(object sender, EventArgs e) { if (TextBox1.Text == Session["gif"].ToString()) Response.Write("OK,正確"); else Response.Write("驗證碼不符合"); }