现在验证码的形式越来越丰富，今天要实现的是在点击图片中的文字来进行校验的验证码，如图
这种验证码验证是验证鼠标是否选中了图片中文字的位置，以及选择的顺序，产生验证码的时候可以提供一组底图，然后随机获取一张图片，随机选取几个字，然后把文字的顺序打乱，分别随机放到图片的一个位置上,然后记录文字的位置和顺序，验证的时候验证一下文字的位置和顺序即可
验证码图片的类
/// <summary> /// 二维码图片 /// </summary> public class VerCodePic { /// <summary> /// 图片链接 /// </summary> public string PicURL { get; set; } /// <summary> /// 第一个字位置 /// </summary> public FontPoint Font1 { get; set; } /// <summary> /// 第二个字位置 /// </summary> public FontPoint Font2 { get; set; } /// <summary> /// 第三个字位置 /// </summary> public FontPoint Font3 { get; set; } /// <summary> /// 第四个字位置 /// </summary> public FontPoint Font4 { get; set; } } /// <summary> /// 文字位置 /// </summary> public class FontPoint { public int X { get; set; } public int Y { get; set; } }
生成验证码图片验证码的方法，在这个方法中指定了生成的验证码图片中字体大小为20个像素，因为验证码底图的大小是固定的，所以就把验证码底图按照字体的大小分成了若干个网格位置，指定一个文字在图片中的位置时只需要随机获取其中一个网格即可，如果这个网格中没有指定过文字，那就把文字放到这个网格中。
提前设定网格的方法
private static ArrayList _FontPoint; public static ArrayList FontPoint { get { if (_FontPoint==null) { _FontPoint = new ArrayList(); for (int x=0;x<10;x++) { for (int y=0;y<5;y++) { _FontPoint.Add(new Models.FontPoint() { X = x * 28, Y = y * 20 }); } } } return _FontPoint; } }
我选定的验证码底图为280*100的，所以按照上边的方法将图片分成了若干个网格，在下边设定一个文字位置的时候随机选取其中一个位置，而且给每个字都设定了不一样的颜色
/// <summary> /// 根据文字和图片获取验证码图片 /// </summary> /// <param name="content"></param> /// <param name="picFileName"></param> /// <returns></returns> public static VerCodePic GetVerCodePic(string content,string picFileName,int fontSize=20) { ClassLoger.Info("FileHelper.GetVerCodePic","开始生成二维码"); Bitmap bmp = new Bitmap(picFileName); List<int> hlist = new List<int>(); VerCodePic codepic = new VerCodePic(); int i = Utils.GetRandom(0, SystemSet.FontPoint.Count - 1); codepic.Font1 = SystemSet.FontPoint[i] as FontPoint; hlist.Add(i); A: int i2 = Utils.GetRandom(0, SystemSet.FontPoint.Count - 1); if (hlist.Contains(i2)) goto A; codepic.Font2 = SystemSet.FontPoint[i2] as FontPoint; hlist.Add(i2); B: int i3 = Utils.GetRandom(0, SystemSet.FontPoint.Count - 1); if (hlist.Contains(i3)) goto B; hlist.Add(i3); codepic.Font3 = SystemSet.FontPoint[i3] as FontPoint; C: int i4 = Utils.GetRandom(0, SystemSet.FontPoint.Count - 1); if (hlist.Contains(i4)) goto C; hlist.Add(i4); codepic.Font4 = SystemSet.FontPoint[i4] as FontPoint;string fileName = (content + "-" + picFileName+"-"+i+"|"+i2+"|"+i3+"|"+i4).MD5()+Path.GetExtension(picFileName); string dir = Path.Combine(SystemSet.ResourcesPath, SystemSet.VerCodePicPath); string filePath = Path.Combine(dir, fileName); if (File.Exists(filePath)) { codepic.PicURL = string.Format("{0}/{1}/{2}", SystemSet.WebResourcesSite, SystemSet.VerCodePicPath, fileName); return codepic; } if (!Directory.Exists(dir)) { Directory.CreateDirectory(dir); } Graphics g = Graphics.FromImage(bmp); Font font = new Font("微软雅黑", fontSize, GraphicsUnit.Pixel); SolidBrush sbrush = new SolidBrush(Color.Black); SolidBrush sbrush1 = new SolidBrush(Color.Peru); SolidBrush sbrush2 = new SolidBrush(Color.YellowGreen); SolidBrush sbrush3 = new SolidBrush(Color.SkyBlue); List<char> fontlist = content.ToList(); ClassLoger.Info("FileHelper.GetVerCodePic", fontlist.Count.ToString()); g.DrawString(fontlist[0].TryToString(), font, sbrush, new PointF(codepic.Font1.X, codepic.Font1.Y)); g.DrawString(fontlist[1].TryToString(), font, sbrush1, new PointF(codepic.Font2.X, codepic.Font2.Y)); g.DrawString(fontlist[2].TryToString(), font, sbrush2, new PointF(codepic.Font3.X, codepic.Font3.Y)); g.DrawString(fontlist[3].TryToString(), font, sbrush3, new PointF(codepic.Font4.X, codepic.Font4.Y)); bmp.Save(filePath, ImageFormat.Jpeg); codepic.PicURL = string.Format("{0}/{1}/{2}",SystemSet.WebResourcesSite, SystemSet.VerCodePicPath, fileName); return codepic; }
获取图片验证码的api接口，在这个接口中从成语库中随机选取了一个成语，然后随机选取了一个图片，然后调用生成图片验证码的方法，生成了图片验证码，并且把验证码对应的信息缓存在redis中，设定缓存时间，将redis的key作为一个临时令牌随同验证码返回
/// <summary> /// 获取验证码，有效时间10分钟 /// </summary> /// <returns></returns> [HttpGet] [Route("vercode")] public JsonResult<VerCodePicViewModel> VerCodePic() { JsonResult<VerCodePicViewModel> result = new JsonResult<VerCodePicViewModel>(); result.code = 1; result.msg = "OK"; try { ClassLoger.Info("VerCodePic","开始获取成语"); cy_dictBll cybll = new cy_dictBll(); IList<cy_dict> cylist = cybll.GetAllcy_dict(); ClassLoger.Info("VerCodePic", cylist.Count.ToString()); int i = Utils.GetRandom(0, cylist.Count-1); ClassLoger.Info("VerCodePic",i.ToString()); cy_dict cy = cylist[i]; ClassLoger.Info("VerCodePic成语：",cy.chengyu); VerCodePicViewModel vcvm = new VerCodePicViewModel(); string sourcePic = FileHelper.GetVerCodePicResource(); if (sourcePic.IsNull() || !File.Exists(sourcePic)) { sourcePic = @"E:\WebResources\images\VerCodePicSource\1.jpg"; } ClassLoger.Info("VerCodePic图片",sourcePic); VerCodePic codepic = FileHelper.GetVerCodePic(cy.chengyu, sourcePic); vcvm.content = cy.chengyu; vcvm.MainPic = codepic.PicURL; result.Result = vcvm; string key = cookieKey(); RedisBase.Item_Set(key, codepic); RedisBase.ExpireEntryAt(key,DateTime.Now.AddMinutes(10)); result.ResultMsg = key; } catch (Exception ex) { ClassLoger.Error("AccountController.VerCodePic",ex); result.code = -1; result.msg = "AccountController.VerCodePic发生异常:"+ex.Message; } return result; }
效果如图：
图片验证码校验接口参数结构
public class CheckPicCodeViewModel { /// <summary> /// 客户端令牌 /// </summary> public string token { get; set; } public double x1 { get; set; } public double x2 { get; set; } public double x3 { get; set; } public double x4 { get; set; } public double y1 { get; set; } public double y2 { get; set; } public double y3 { get; set; } public double y4 { get; set; } }
验证码校验接口
/// <summary> /// 校验图片验证码是否正确 /// </summary> /// <param name="piccode"></param> /// <returns></returns> [HttpPost] [Route("checkpiccode")] public async Task<IHttpActionResult> CheckPicCode([FromBody]CheckPicCodeViewModel piccode) { JsonResult<bool> result = new JsonResult<bool>(); result.code = 1; result.msg = "OK"; if (piccode == null) { result.Result = false; result.ResultMsg = "参数错误"; return Ok(result); } if (string.IsNullOrEmpty(piccode.token) || !RedisBase.ContainsKey(piccode.token)) { result.Result = false; result.ResultMsg = "验证码已过期"; return Ok(result); } result.Result = await Task.Run<bool>(() => { bool flag = false; VerCodePic codepic = RedisBase.Item_Get<VerCodePic>(piccode.token); if (Math.Abs(codepic.Font1.X - piccode.x1) > 0.5 || Math.Abs(codepic.Font1.Y - piccode.y1) > 0.5 || Math.Abs(codepic.Font2.X - piccode.x2) > 0.5 || Math.Abs(codepic.Font2.Y - piccode.y2) > 0.5 || Math.Abs(codepic.Font3.X - piccode.x3) > 0.5 || Math.Abs(codepic.Font3.Y - piccode.y3) > 0.5 || Math.Abs(codepic.Font4.X - piccode.x4) > 0.5 || Math.Abs(codepic.Font4.Y - piccode.y4) > 0.5) { flag = false; result.ResultMsg = "验证码错误"; } else { flag = true; result.ResultMsg = "验证码正确"; } return flag; }); return Ok(result); }
传入用户选中的位置和顺序，并对其进行验证
相关文章
