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驗證碼源代碼
下麵是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); /**////釋放占用的資源 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,嗬,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製字節數組，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位作為字節數組第一個元素 區位碼第3位和區位碼第4位作為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" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="https://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"); }
最後更新：2017-04-02 00:06:24