控制器中的
public ActionResult valideCode() {
//创建长的为5的字符串
string strvalideCode = Title.GetRandomCode(5);
//将验证码传递到服务器以便验证验证码是否正确
Session["ValideCode"] = strvalideCode;
//将生成的字符串转换为字符串，二进制数组接收
byte[] ImgValideCode = Title.CreateImage(strvalideCode);
return File(ImgValideCode, "image/jpeg");
}
验证码的自定义类
/// <summary>
/// 获得随机字符串
/// </summary>
/// <param name="intLength">随机数的长度</param>
/// <returns>随机数字符串</returns>
public static string GetRandomCode(int intLength)
{
/*产生数字和密码混合的随机数*/
string strReturn = string.Empty;
Random random = new Random();//随机数
for (int i = 0; i < intLength; i++)
{
char cRerult;
int intRandom = random.Next();//产生一个非负随机整数
/*根据当前随机数来确定字符串*/
//intRandom % 3 获取的是intRandom/3 得到的余数
if (intRandom % 3 == 0)
{
//产生数字
//位数来产生数字
cRerult = (char)(0x30 + (intRandom % 10));
}
else if (intRandom % 3 == 1)
{
//位数产生大写字母:大写字符 65-97 A 65
//68 D 25 Z
cRerult = (char)(0x41 + (intRandom % 0x1a));
}
else
{
//余数为2
//产生小写字母 98-116
cRerult = (char)(0x61 + (intRandom % 0x1a));
}
strReturn += cRerult.ToString();
}
return strReturn;
}
/// <summary>
/// 根据字符串创建验证码 返回值：二进制数组
/// </summary>
/// <param name="strRandom">字符串</param>
/// <returns>图片</returns>
public static byte[] CreateImage(string strRandom)
{
//新增图片
Bitmap newBitmap = new Bitmap(strRandom.Length * 20, 30);
Graphics g = Graphics.FromImage(newBitmap);
g.Clear(Color.White);
//在图片上绘制文字
SolidBrush solidBrush = new SolidBrush(Color.Red);
g.DrawString(strRandom, new Font("Aril", 17), solidBrush, 12, 1);
//在图片上绘制干扰线
Random random = new Random();
for (int i = 0; i < 10; i++)
{
//产生一条线，并绘制到画布。 起始点（x,y） 总结点
int x1 = random.Next(newBitmap.Width);
int y1 = random.Next(newBitmap.Height);
int x2 = random.Next(newBitmap.Width);
int y2 = random.Next(newBitmap.Height);
g.DrawLine(new Pen(Color.DarkGray), x1, y1, x2, y2);
}
//绘制图片的前景干扰点
for (int i = 0; i < 100; i++)
{
int x = random.Next(newBitmap.Width);
int y = random.Next(newBitmap.Height);
newBitmap.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//在最外边绘制边框
g.DrawRectangle(new Pen(Color.Blue), 0, 0, newBitmap.Width, newBitmap.Height);
g.DrawRectangle(new Pen(Color.Blue), -1, -1, newBitmap.Width, newBitmap.Height);
//将图转保存到内存流中
MemoryStream ms = new MemoryStream();
newBitmap.Save(ms, ImageFormat.Jpeg);
return ms.ToArray();//将流内容写入byte数组返回