代码是以前项目中的 后来移植到core的上面
以下是代码(封装的类):
public class ValidateCode { private string code; private const int ImageHeigth = 22; //验证码图片的高度 private const double ImageLengthBase = 13; //验证码图片中每个字符的宽度 private const int ImageLineNumber = 10; //噪音线的数量 private const int ImagePointNumber = 50; //噪点的数量 private int length; public string key; //此处用来保存验证码到Session的Key的 private string url = "/imagecode/"; //设置验证码的长度和内容 public ValidateCode() { this.length = 4; this.code = string.Empty; } ///<summary> ///产生随机的验证码并加入缓存 ///</summary> /// <param name = "length" > 验证码长度 </ param > ///< returns ></ returns > public string CreateCode(int length) { if (length <= 0) { return string.Empty; } Random random = new Random(); StringBuilder builder = new StringBuilder(); //产生随机的验证码并拼接起来 for (int i = 0; i < length; i++) { builder.Append(random.Next(0, 10)); } this.code = builder.ToString(); // MCachedHelper.Set<string>(key, code, DateTime.Now.AddMinutes(2)); RedisHelper.StringSet(key, code, 2, RedisFolderEnum.code, RedisEnum.Four); return this.code; } //图形码的内容 可以自定义字母什么的 private static char[] constant = { '0','1','2','3','4','5','6','7','8','9' }; /// <summary> /// Creates the code. /// </summary> public string CreateCode() { Random random = new Random(); StringBuilder builder = new StringBuilder(); for (int i = 0; i < 4; i++) //i<6 生成的就是六位的 { builder.Append(constant[random.Next(0, 10)]); } this.code = builder.ToString(); //将图形码的内容存储在redis中 验证是取就可以 RedisHelper.StringSet(key, code, 2, RedisFolderEnum.code, RedisEnum.Four); return builder.ToString(); } /// <summary> /// 根据长度产生验证码 , 并将验证码画成图片 /// </summary> /// <param name="length">Length.</param> public void CreateValidateImage(int length) { this.CreateCode(); this.CreateValidateImage(this.code); } /// <summary> /// 将验证码存储在七牛云上 /// </summary> /// <param name="localFile"></param> /// <param name="saveKey"></param> public static void UploadFile(string localFile, string saveKey) { #region Mac mac = new Mac("", "");//七牛云ak // 上传策略,参见 // https://developer.qiniu.com/kodo/manual/put-policy PutPolicy putPolicy = new PutPolicy(); // 如果需要设置为"覆盖"上传(如果云端已有同名文件则覆盖),请使用 SCOPE = "BUCKET:KEY" // putPolicy.Scope = bucket + ":" + saveKey; putPolicy.Scope = "img-s-code"; // 上传策略有效期(对应于生成的凭证的有效期) putPolicy.SetExpires(3600); // 上传到云端多少天后自动删除该文件,如果不设置(即保持默认默认)则不删除 putPolicy.DeleteAfterDays = 1; string jstr = putPolicy.ToJsonString(); //获取上传凭证 var uploadToken = Auth.CreateUploadToken(mac, jstr); Qiniu.Common.Config.AutoZone("", "img-s-code", false);//七牛云ak 详情看我的七牛云图片上传 FormUploader upLoader = new FormUploader(false); HttpResult result = upLoader.UploadFile(localFile, saveKey, uploadToken); #endregion if (result.Code != 200) { throw new Exception(result.RefText); } return; } /// <summary> /// 根据产生的验证码生成图片 /// </summary> /// <param name="code">Code.</param> public void CreateValidateImage(string code) { if (!string.IsNullOrEmpty(code)) { //this.Session[key] = code; //初始化位图Bitmap对象,指定图片对象的大小(宽,高) Bitmap image = new Bitmap((int)Math.Ceiling((double)(code.Length * ImageLengthBase)), ImageHeigth); //初始化一块画布 Graphics graphics = Graphics.FromImage(image); Random random = new Random(); try { int num5; graphics.Clear(Color.White); //绘制噪音线 for (num5 = 0; num5 < ImageLineNumber; num5++) { int num = random.Next(image.Width); int num3 = random.Next(image.Height); int num2 = random.Next(image.Width); int num4 = random.Next(image.Height); graphics.DrawLine(new Pen(Color.Silver), num, num3, num2, num4); } //验证码字体样式 Font font = new Font("Tahoma", 10, FontStyle.Italic | FontStyle.Bold); LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true); //绘制验证码到画布 graphics.DrawString(code, font, brush, (float)3, (float)2); //绘制噪点 for (num5 = 0; num5 < ImagePointNumber; num5++) { int x = random.Next(image.Width); int y = random.Next(image.Height); image.SetPixel(x, y, Color.FromArgb(random.Next())); } graphics.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); //保存图片 if (!Directory.Exists(url)) { Directory.CreateDirectory(url);//如果文件夹不存在就创建它 } image.Save(url + key + ".gif", ImageFormat.Gif); UploadFile(url + key + ".gif", key + ".gif"); } finally { graphics.Dispose(); image.Dispose(); } } } //Properties public string Code { get; set; } public int Length { get { return this.length; } set { this.length = value; } } }
下面是使用方法:
validatecode.key = Guid.NewGuid().ToString(); validatecode.CreateValidateImage(4); validate = new ValidateCodeView { name = validatecode.key, 返回的key imgUrl = $"{_validate.Url}{validatecode.key}.gif" 返回的验证码图片 };
验证方法:
比对输入的值==redis存储的值