.net中編寫簡單驗證碼
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;
using System.IO;
public partial class yanzhma : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
CheckCodeImage(CheckCode());
}
//隨機生成驗證碼字符串
private string CheckCode() {
int number;
string strCode = string.Empty;
//隨機種子
Random random = new Random();
for (int i = 0; i < 4;i++ ) {//四位校驗碼
number = random.Next();
//字符從0-9,A—Z中隨機產生,對應的AscII碼爲48-57,65-90
number = number % 36;
if (number < 10)
{
number += 48;
}
else {
number += 55;
}
strCode += ((char)number).ToString();
}
//在Cookie中保存校驗碼
Response.Cookies.Add(new HttpCookie("CheckCode", strCode));
return strCode;
}
//根據校驗碼輸出圖片
private void CheckCodeImage(string checkCode) {
//若校驗碼爲空,直接返回
if(checkCode==null || checkCode.Trim()==string .Empty){
return;
}
//根據校驗碼輸出圖片長度
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((double)(checkCode.Length * 15)), 20);
//創建Graphics對象,繪製圖片
Graphics g = Graphics.FromImage(image);
try
{
Random random = new Random();
//清空背景顏色
g.Clear(Color.White);
//繪製圖片的噪音線10條
for (int i = 0; i < 10; i++)
{
//噪音線的起點座標(x1,y1)終點座標(x2,y2)
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
//用銀色繪製噪音線
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
//輸出圖片校驗碼字體
Font font = new Font("Arial", 12, FontStyle.Italic);
//線性變換畫刷
Brush brush = new SolidBrush(Color.Chocolate);
g.DrawString(checkCode, font,brush, 2, 2);
//繪製圖片的噪音點
for (int i = 0; i < 50; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//繪製圖片邊框
g.DrawRectangle(new Pen(Color.SaddleBrown), 0, 0, image.Width - 1, image.Height - 1);
//創建內流輸出圖片
using (MemoryStream ms = new MemoryStream())
{
image.Save(ms,System.Drawing.Imaging.ImageFormat.Png);//保存圖片格式爲png
Response.ClearContent();
Response.ContentType = "image/Png";
//輸出二進制流
Response.BinaryWrite(ms.ToArray());
}
}
catch (Exception oe)
{
Response.Write(oe.ToString());
}
finally {
g.Dispose();
image.Dispose();
}
}
}
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;
using System.IO;
public partial class yanzhma : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
CheckCodeImage(CheckCode());
}
//隨機生成驗證碼字符串
private string CheckCode() {
int number;
string strCode = string.Empty;
//隨機種子
Random random = new Random();
for (int i = 0; i < 4;i++ ) {//四位校驗碼
number = random.Next();
//字符從0-9,A—Z中隨機產生,對應的AscII碼爲48-57,65-90
number = number % 36;
if (number < 10)
{
number += 48;
}
else {
number += 55;
}
strCode += ((char)number).ToString();
}
//在Cookie中保存校驗碼
Response.Cookies.Add(new HttpCookie("CheckCode", strCode));
return strCode;
}
//根據校驗碼輸出圖片
private void CheckCodeImage(string checkCode) {
//若校驗碼爲空,直接返回
if(checkCode==null || checkCode.Trim()==string .Empty){
return;
}
//根據校驗碼輸出圖片長度
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((double)(checkCode.Length * 15)), 20);
//創建Graphics對象,繪製圖片
Graphics g = Graphics.FromImage(image);
try
{
Random random = new Random();
//清空背景顏色
g.Clear(Color.White);
//繪製圖片的噪音線10條
for (int i = 0; i < 10; i++)
{
//噪音線的起點座標(x1,y1)終點座標(x2,y2)
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
//用銀色繪製噪音線
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
//輸出圖片校驗碼字體
Font font = new Font("Arial", 12, FontStyle.Italic);
//線性變換畫刷
Brush brush = new SolidBrush(Color.Chocolate);
g.DrawString(checkCode, font,brush, 2, 2);
//繪製圖片的噪音點
for (int i = 0; i < 50; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//繪製圖片邊框
g.DrawRectangle(new Pen(Color.SaddleBrown), 0, 0, image.Width - 1, image.Height - 1);
//創建內流輸出圖片
using (MemoryStream ms = new MemoryStream())
{
image.Save(ms,System.Drawing.Imaging.ImageFormat.Png);//保存圖片格式爲png
Response.ClearContent();
Response.ContentType = "image/Png";
//輸出二進制流
Response.BinaryWrite(ms.ToArray());
}
}
catch (Exception oe)
{
Response.Write(oe.ToString());
}
finally {
g.Dispose();
image.Dispose();
}
}
}
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