Asp.net Web Api实现图片点击式图片验证码功能

/// <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; } }

 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;   }  }

/// <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;  }

/// <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;  }

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; } }

/// <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);  }