验证码
实现代码
public void ValidateImg() { VerifyCodeSugar v = new VerifyCodeSugar(); //是否随机字体颜色 v.SetIsRandomColor = true; //随机码的旋转角度 v.SetRandomAngle = 4; //文字大小 v.SetFontSize = 15; //背景色 //v.SetBackgroundColor //前景噪点数量 //v.SetForeNoisePointCount = 3; //v.SetFontColor =Color.Red; //...还有更多设置不介绍了 var questionList = new Dictionary<string, string>() { {"1+1=？","2"}, {"喜羊羊主角叫什么名字？","喜羊羊" }, {"【我爱你】中间的那个字？","爱" }, }; var questionItem = v.GetQuestion();//不赋值为随机验证码 例如： 1*2=? 这种 //指定验证文本 //v.SetVerifyCodeText v.SetVerifyCodeText = questionItem.Key; Session["VerifyCode"] = questionItem.Value; //输出图片 v.OutputImage(System.Web.HttpContext.Current.Response); }
封装类
using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.IO; using System.Linq; using System.Text; using System.Web; namespace Idea.Models { /// <summary> /// 验证码类 /// </summary> public class VerifyCodeSugar { private Random objRandom = new Random(); #region setting /// <summary> /// //验证码长度 /// </summary> public int SetLength = 4; /// <summary> /// 验证码字符串 /// </summary> public string SetVerifyCodeText { get; set; } /// <summary> /// 是否加入小写字母 /// </summary> public bool SetAddLowerLetter = false; /// <summary> /// 是否加入大写字母 /// </summary> public bool SetAddUpperLetter = false; /// <summary> /// 字体大小 /// </summary> public int SetFontSize = 18; /// <summary> /// //字体颜色 /// </summary> public Color SetFontColor = Color.Blue; /// <summary> /// 字体类型 /// </summary> public string SetFontFamily = "Verdana"; /// <summary> /// 背景色 /// </summary> public Color SetBackgroundColor = Color.AliceBlue; /// <summary> /// 前景噪点数量 /// </summary> public int SetForeNoisePointCount = 2; /// <summary> /// 随机码的旋转角度 /// </summary> public int SetRandomAngle = 40; /// <summary> /// 是否随机字体颜色 /// </summary> public bool SetIsRandomColor = false; /// <summary> /// 图片宽度 /// </summary> private int SetWith { get { return this.SetVerifyCodeText.Length * SetFontSize; } } /// <summary> /// 图片高度 /// </summary> private int SetHeight { get { return Convert.ToInt32((60.0 / 100) * SetFontSize + SetFontSize); } } #endregion #region Constructor Method public VerifyCodeSugar() { this.GetVerifyCodeText(); } #endregion #region Private Method /// <summary> /// 得到验证码字符串 /// </summary> private void GetVerifyCodeText() { //没有外部输入验证码时随机生成 if (String.IsNullOrEmpty(this.SetVerifyCodeText)) { StringBuilder objStringBuilder = new StringBuilder(); //加入数字1-9 for (int i = 1; i <= 9; i++) { objStringBuilder.Append(i.ToString()); } //加入大写字母A-Z，不包括O if (this.SetAddUpperLetter) { char temp = ' '; for (int i = 0; i < 26; i++) { temp = Convert.ToChar(i + 65); //如果生成的字母不是'O' if (!temp.Equals('O')) { objStringBuilder.Append(temp); } } } //加入小写字母a-z，不包括o if (this.SetAddLowerLetter) { char temp = ' '; for (int i = 0; i < 26; i++) { temp = Convert.ToChar(i + 97); //如果生成的字母不是'o' if (!temp.Equals('o')) { objStringBuilder.Append(temp); } } } //生成验证码字符串 { int index = 0; for (int i = 0; i < SetLength; i++) { index = objRandom.Next(0, objStringBuilder.Length); this.SetVerifyCodeText += objStringBuilder[index]; objStringBuilder.Remove(index, 1); } } } } /// <summary> /// 得到验证码图片 /// </summary> private Bitmap GetVerifyCodeImage() { Bitmap result = null; //创建绘图 result = new Bitmap(SetWith, SetHeight); using (Graphics objGraphics = Graphics.FromImage(result)) { objGraphics.SmoothingMode = SmoothingMode.HighQuality; //清除整个绘图面并以指定背景色填充 objGraphics.Clear(this.SetBackgroundColor); //创建画笔 using (SolidBrush objSolidBrush = new SolidBrush(this.SetFontColor)) { this.AddForeNoisePoint(result); this.AddBackgroundNoisePoint(result, objGraphics); //文字居中 StringFormat objStringFormat = new StringFormat(StringFormatFlags.NoClip); objStringFormat.Alignment = StringAlignment.Center; objStringFormat.LineAlignment = StringAlignment.Center; //字体样式 Font objFont = new Font(this.SetFontFamily, objRandom.Next(this.SetFontSize - 3, this.SetFontSize), FontStyle.Regular); //验证码旋转，防止机器识别 char[] chars = this.SetVerifyCodeText.ToCharArray(); for (int i = 0; i < chars.Length; i++) { //转动的度数 float angle = objRandom.Next(-this.SetRandomAngle, this.SetRandomAngle); objGraphics.TranslateTransform(12, 12); objGraphics.RotateTransform(angle); objGraphics.DrawString(chars[i].ToString(), objFont, objSolidBrush, -2, 2, objStringFormat); objGraphics.RotateTransform(-angle); objGraphics.TranslateTransform(2, -12); } } } return result; } /// <summary> /// 添加前景噪点 /// </summary> /// <param name="objBitmap"></param> private void AddForeNoisePoint(Bitmap objBitmap) { for (int i = 0; i < objBitmap.Width * this.SetForeNoisePointCount; i++) { objBitmap.SetPixel(objRandom.Next(objBitmap.Width), objRandom.Next(objBitmap.Height), this.SetFontColor); } } /// <summary> /// 添加背景噪点 /// </summary> /// <param name="objBitmap"></param> /// <param name="objGraphics"></param> private void AddBackgroundNoisePoint(Bitmap objBitmap, Graphics objGraphics) { using (Pen objPen = new Pen(Color.Azure, 0)) { for (int i = 0; i < objBitmap.Width * 2; i++) { objGraphics.DrawRectangle(objPen, objRandom.Next(objBitmap.Width), objRandom.Next(objBitmap.Height), 1, 1); } } } /// <summary> /// 获取随机颜色 /// </summary> /// <returns></returns> private Color GetRandomColor() { Random RandomNum_First = new Random((int)DateTime.Now.Ticks); // 对于C#的随机数，没什么好说的 System.Threading.Thread.Sleep(RandomNum_First.Next(50)); Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks); // 为了在白色背景上显示，尽量生成深色 int int_Red = RandomNum_First.Next(256); int int_Green = RandomNum_Sencond.Next(256); int int_Blue = (int_Red + int_Green > 400) ? 0 : 400 - int_Red - int_Green; int_Blue = (int_Blue > 255) ? 255 : int_Blue; return Color.FromArgb(int_Red, int_Green, int_Blue); } #endregion #region Public Method /// <summary> /// 输出验证码图片 /// </summary> /// <param name="objHttpResponse">Http响应实例</param> /// <returns>输出是否成功</returns> public bool OutputImage(HttpResponse objHttpResponse) { bool result = false; if (this.SetIsRandomColor) { this.SetFontColor = GetRandomColor(); ; } using (Bitmap objBitmap = this.GetVerifyCodeImage()) { if (objBitmap != null) { using (MemoryStream objMS = new MemoryStream()) { objBitmap.Save(objMS, ImageFormat.Jpeg); HttpContext.Current.Response.ClearContent(); HttpContext.Current.Response.ContentType = "image/Jpeg"; HttpContext.Current.Response.BinaryWrite(objMS.ToArray()); HttpContext.Current.Response.Flush(); HttpContext.Current.Response.End(); result = true; } } } return result; } /// <summary> /// 获取问题 /// </summary> /// <param name="questionList">默认数字加减验证</param> /// <returns></returns> public KeyValuePair<string, string> GetQuestion(Dictionary<string, string> questionList = null) { if (questionList == null) { questionList = new Dictionary<string, string>(); var operArray = new string[] { "+", "*", "num" }; var left = objRandom.Next(0, 10); var right = objRandom.Next(0, 10); var oper = operArray[objRandom.Next(0, operArray.Length)]; if (oper == "+") { string key = string.Format("{0}+{1}=?", left, right); string val = (left + right).ToString(); questionList.Add(key, val); } else if (oper == "*") { string key = string.Format("{0}×{1}=?", left, right); string val = (left * right).ToString(); questionList.Add(key, val); } else { var num = objRandom.Next(1000, 9999); ; questionList.Add(num.ToString(), num.ToString()); } } return questionList.ToList()[objRandom.Next(0, questionList.Count)]; } #endregion } }
/// <summary>
/// 生成验证码图片
/// </summary>
public static string build(HttpResponseBase response)
{
string checkCode = GenerateCheckCode();
if (checkCode == null || checkCode.Trim() == String.Empty)
return "";
//控制图片大小(长,宽)
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
Graphics g = Graphics.FromImage(image);
try {
//生成随机生成器
Random random = new Random();
//清空图片背景色
Color color = Color.FromArgb(171, 156, 137);
g.Clear(color);
//画图片的背景噪音线
for (int i = 0; i < 1; i++) {
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
//控制图片上字体
Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
//System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Black, Color.Black, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2);
//画图片的前景噪音点
for (int i = 0; i < 1; i++) {
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线
//g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
response.ClearContent();
response.ContentType = "image/Gif";
response.BinaryWrite(ms.ToArray());
} finally {
g.Dispose();
image.Dispose();
}
return checkCode;
}
/// <summary>
/// 生成随机数
/// </summary>
/// <returns></returns>
private static string GenerateCheckCode()
{
int number;
char code;
string checkCode = String.Empty;
System.Random random = new Random();
for (int i = 0; i < 4; i++) {
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
checkCode += code.ToString();
}
return checkCode;
}
