转载原创）验证码参考网址：
https://blog.csdn.net/ChaITSimpleLove/article/details/80531791
首先通过Nuget： Install-Package ZKWeb.System.Drawing
1.项目右键新建一个类ValidationCode.cs
添加引用:
using System.DrawingCore;
using System.DrawingCore.Drawing2D;
using System.DrawingCore.Imaging;
using System.IO;
生产验证码代码;
namespace lwz
{
public class ValidationCode
{
//***********************************************
public sealed class VerifyCodeHelper
{
#region 单例模式
//创建私有化静态obj锁
private static readonly object _ObjLock = new object();
//创建私有静态字段，接收类的实例化对象
private static VerifyCodeHelper _VerifyCodeHelper = null;
//构造函数私有化
private VerifyCodeHelper() { }
//创建单利对象资源并返回
public static VerifyCodeHelper GetSingleObj()
{
if (_VerifyCodeHelper == null)
{
lock (_ObjLock)
{
if (_VerifyCodeHelper == null)
_VerifyCodeHelper = new VerifyCodeHelper();
}
}
return _VerifyCodeHelper;
}
#endregion
#region 生产验证码
public enum VerifyCodeType { NumberVerifyCode, AbcVerifyCode, MixVerifyCode };
/// <summary>
/// 1.数字验证码
/// </summary>
/// <param name="length"></param>
/// <returns></returns>
private string CreateNumberVerifyCode(int length)
{
int[] randMembers = new int[length];
int[] validateNums = new int[length];
string validateNumberStr = "";
//生成起始序列值
int seekSeek = unchecked((int)DateTime.Now.Ticks);
Random seekRand = new Random(seekSeek);
int beginSeek = seekRand.Next(0, Int32.MaxValue - length * 10000);
int[] seeks = new int[length];
for (int i = 0; i < length; i++)
{
beginSeek += 10000;
seeks[i] = beginSeek;
}
//生成随机数字
for (int i = 0; i < length; i++)
{
Random rand = new Random(seeks[i]);
int pownum = 1 * (int)Math.Pow(10, length);
randMembers[i] = rand.Next(pownum, Int32.MaxValue);
}
//抽取随机数字
for (int i = 0; i < length; i++)
{
string numStr = randMembers[i].ToString();
int numLength = numStr.Length;
Random rand = new Random();
int numPosition = rand.Next(0, numLength - 1);
validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
}
//生成验证码
for (int i = 0; i < length; i++)
{
validateNumberStr += validateNums[i].ToString();
}
return validateNumberStr;
}
/// <summary>
/// 2.字母验证码
/// </summary>
/// <param name="length">字符长度</param>
/// <returns>验证码字符</returns>
private string CreateAbcVerifyCode(int length)
{
char[] verification = new char[length];
char[] dictionary = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
};
Random random = new Random();
for (int i = 0; i < length; i++)
{
verification[i] = dictionary[random.Next(dictionary.Length - 1)];
}
return new string(verification);
}
/// <summary>
/// 3.混合验证码
/// </summary>
/// <param name="length">字符长度</param>
/// <returns>验证码字符</returns>
private string CreateMixVerifyCode(int length)
{
char[] verification = new char[length];
char[] dictionary = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
};
Random random = new Random();
for (int i = 0; i < length; i++)
{
verification[i] = dictionary[random.Next(dictionary.Length - 1)];
}
return new string(verification);
}
/// <summary>
/// 产生验证码（随机产生4-6位）
/// </summary>
/// <param name="type">验证码类型：数字，字符，符合</param>
/// <returns></returns>
public string CreateVerifyCode(VerifyCodeType type)
{
string verifyCode = string.Empty;
Random random = new Random();
int length = random.Next(4, 6);
switch (type)
{
case VerifyCodeType.NumberVerifyCode:
verifyCode = GetSingleObj().CreateNumberVerifyCode(length);
break;
case VerifyCodeType.AbcVerifyCode:
verifyCode = GetSingleObj().CreateAbcVerifyCode(length);
break;
case VerifyCodeType.MixVerifyCode:
verifyCode = GetSingleObj().CreateMixVerifyCode(length);
break;
}
return verifyCode;
}
#endregion
#region 验证码图片
/// <summary>
/// 验证码图片 => Bitmap
/// </summary>
/// <param name="verifyCode">验证码</param>
/// <param name="width">宽</param>
/// <param name="height">高</param>
/// <returns>Bitmap</returns>
public System.DrawingCore.Bitmap CreateBitmapByImgVerifyCode(string verifyCode, int width, int height)
{
System.DrawingCore.Font font = new System.DrawingCore.Font("Arial", 14, (System.DrawingCore.FontStyle.Bold | System.DrawingCore.FontStyle.Italic));
System.DrawingCore.Brush brush;
System.DrawingCore.Bitmap bitmap = new System.DrawingCore.Bitmap(width, height);
System.DrawingCore.Graphics g = System.DrawingCore.Graphics.FromImage(bitmap);
System.DrawingCore.SizeF totalSizeF = g.MeasureString(verifyCode, font);
System.DrawingCore.SizeF curCharSizeF;
System.DrawingCore.PointF startPointF = new System.DrawingCore.PointF(0, (height - totalSizeF.Height) / 2);
Random random = new Random(); //随机数产生器
g.Clear(System.DrawingCore.Color.White); //清空图片背景色
for (int i = 0; i < verifyCode.Length; i++)
{
brush = new LinearGradientBrush(new System.DrawingCore.Point(0, 0), new System.DrawingCore.Point(1, 1), System.DrawingCore.Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)), System.DrawingCore.Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)));
g.DrawString(verifyCode[i].ToString(), font, brush, startPointF);
curCharSizeF = g.MeasureString(verifyCode[i].ToString(), font);
startPointF.X += curCharSizeF.Width;
}
//画图片的干扰线
for (int i = 0; i < 10; i++)
{
int x1 = random.Next(bitmap.Width);
int x2 = random.Next(bitmap.Width);
int y1 = random.Next(bitmap.Height);
int y2 = random.Next(bitmap.Height);
g.DrawLine(new System.DrawingCore.Pen(System.DrawingCore.Color.Silver), x1, y1, x2, y2);
}
//画图片的前景干扰点
for (int i = 0; i < 100; i++)
{
int x = random.Next(bitmap.Width);
int y = random.Next(bitmap.Height);
bitmap.SetPixel(x, y, System.DrawingCore.Color.FromArgb(random.Next()));
}
g.DrawRectangle(new System.DrawingCore.Pen(System.DrawingCore.Color.Silver), 0, 0, bitmap.Width - 1, bitmap.Height - 1); //画图片的边框线
g.Dispose();
return bitmap;
}
/// <summary>
/// 验证码图片 => byte[]
/// </summary>
/// <param name="verifyCode">验证码</param>
/// <param name="width">宽</param>
/// <param name="height">高</param>
/// <returns>byte[]</returns>
public byte[] CreateByteByImgVerifyCode(string verifyCode, int width, int height)
{
System.DrawingCore.Font font = new System.DrawingCore.Font("Arial", 14, (System.DrawingCore.FontStyle.Bold | System.DrawingCore.FontStyle.Italic));
System.DrawingCore.Brush brush;
System.DrawingCore.Bitmap bitmap = new System.DrawingCore.Bitmap(width, height);
System.DrawingCore.Graphics g = System.DrawingCore.Graphics.FromImage(bitmap);
System.DrawingCore.SizeF totalSizeF = g.MeasureString(verifyCode, font);
System.DrawingCore.SizeF curCharSizeF;
System.DrawingCore.PointF startPointF = new System.DrawingCore.PointF(0, (height - totalSizeF.Height) / 2);
Random random = new Random(); //随机数产生器
g.Clear(System.DrawingCore.Color.White); //清空图片背景色
for (int i = 0; i < verifyCode.Length; i++)
{
brush = new LinearGradientBrush(new System.DrawingCore.Point(0, 0), new System.DrawingCore.Point(1, 1), System.DrawingCore.Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)), System.DrawingCore.Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)));
g.DrawString(verifyCode[i].ToString(), font, brush, startPointF);
curCharSizeF = g.MeasureString(verifyCode[i].ToString(), font);
startPointF.X += curCharSizeF.Width;
}
//画图片的干扰线
for (int i = 0; i < 10; i++)
{
int x1 = random.Next(bitmap.Width);
int x2 = random.Next(bitmap.Width);
int y1 = random.Next(bitmap.Height);
int y2 = random.Next(bitmap.Height);
g.DrawLine(new System.DrawingCore.Pen(System.DrawingCore.Color.Silver), x1, y1, x2, y2);
}
//画图片的前景干扰点
for (int i = 0; i < 100; i++)
{
int x = random.Next(bitmap.Width);
int y = random.Next(bitmap.Height);
bitmap.SetPixel(x, y, System.DrawingCore.Color.FromArgb(random.Next()));
}
g.DrawRectangle(new System.DrawingCore.Pen(System.DrawingCore.Color.Silver), 0, 0, bitmap.Width - 1, bitmap.Height - 1); //画图片的边框线
g.Dispose();
//保存图片数据
MemoryStream stream = new MemoryStream();
bitmap.Save(stream, ImageFormat.Jpeg);
//输出图片流
return stream.ToArray();
}
#endregion
}
}
}
2.新建一个验证码控制器：ValidationCodeController
添加引用:
using static lwz.ValidationCode;
using System.DrawingCore.Imaging;
using System.IO;
using Microsoft.AspNetCore.Http;
代码：
namespace lwz.Controllers
{
public class ValidationCodeController : Controller
{
/// <summary>
/// 数字验证码
/// </summary>
/// <returns></returns>
public FileContentResult NumberVerifyCode()
{
string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.NumberVerifyCode);
byte[] codeImage = VerifyCodeHelper.GetSingleObj().CreateByteByImgVerifyCode(code, 100, 40);
HttpContext.Session.SetString("Code", code);
return File(codeImage, @"image/jpeg");
}
/// <summary>
/// 字母验证码
/// </summary>
/// <returns></returns>
public FileContentResult AbcVerifyCode()
{
string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.AbcVerifyCode);
var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);
MemoryStream stream = new MemoryStream();
bitmap.Save(stream, ImageFormat.Png);
HttpContext.Session.SetString("Code", code);
return File(stream.ToArray(), "image/png");
}
public IActionResult ValidationCode()
{
/// <summary>
/// 混合验证码
/// </summary>
/// <returns></returns>
string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.MixVerifyCode);
var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);
MemoryStream stream = new MemoryStream();
bitmap.Save(stream, ImageFormat.Gif);
HttpContext.Session.SetString("Code", code);
return File(stream.ToArray(), "image/gif");
}
}
}
3.在其他需要引用“验证码控制器中的方法”的控制器编写代码
[HttpGet]
public IActionResult TeacherLogin(int i)
{
return View();
}
[HttpPost]
public IActionResult TeacherLogin(string Teachername, string Password, string Class, string Code_input)
{
string Code = HttpContext.Session.GetString("Code");
if (string.IsNullOrEmpty(Code_input))
{
var script = String.Format("<script>alert('验证码不为空，请重新登录！');location.href='{0}'</script>", Url.Action("TeacherLogin", "Teacher"));
return Content(script, "text/html");
}
if (Code != Code_input)
{
var script = String.Format("<script>alert('验证码错误，请重新登录！');location.href='{0}'</script>", Url.Action("TeacherLogin", "Teacher"));
return Content(script, "text/html");
}
}
4.登陆视图
<div class="Code_place">
@*<img id="nubImg" title="数字验证码" src="/Admin/AdminCode" alt="vcode" onclick="refresh()" style="cursor:pointer;" />*@
<img id="mixImg" title="数字字母混合验证码" src="/ValidationCode/ValidationCode" alt="vcode" onclick="this.src=this.src+'?'" style="cursor:pointer;" />
<p style="color:blue;font-size:14px;">看不清？点击图片</p>
</div>
<script type="text/javascript">
function refresh() {
var id = document.getElementById("nubImg");
var str = "/ValidationCode/ValidationCode?random=" + Math.random();
id.setAttribute("src", str);
}
</script>