.Net Core中通过Json或直接获取图形验证码（数字验证码、字母验证码、混合验证码）
很多人写的博客大家看了会一知半解，不知道怎么用，应该引用什么类库或者代码不全，这样很多小白很是头疼，尤其是尝新技术更是如此。我们这边不止告诉你步骤，而且还提供开源demo。随着时间的推移，我们的demo库会日益强大请及时收藏GitHub。
1.首先你需要Nuget引用类库
Install-Package ZKWeb.System.Drawing -Version 4.0.1
2.创建公共类VerifyCodeHelper和CommonHelper
（1）CommonHelper中添加图形处理方法
#region 验证码public static byte[] Bitmap2Byte(Bitmap bitmap)
{using (MemoryStream stream = new MemoryStream())
{
bitmap.Save(stream, ImageFormat.Jpeg);byte[] data = new byte[stream.Length];
stream.Seek(0, SeekOrigin.Begin);
stream.Read(data, 0, Convert.ToInt32(stream.Length));return data;
}
}#endregion
（2）VerifyCodeHelper添加图形处理方法
public 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 Bitmap CreateBitmapByImgVerifyCode(string verifyCode, int width, int height)
{
Font font = new Font("Arial", 14, (FontStyle.Bold | FontStyle.Italic));
Brush brush;
Bitmap bitmap = new Bitmap(width, height);
Graphics g = Graphics.FromImage(bitmap);
SizeF totalSizeF = g.MeasureString(verifyCode, font);
SizeF curCharSizeF;
PointF startPointF = new PointF(0, (height - totalSizeF.Height) / 2);
Random random = new Random(); //随机数产生器g.Clear(Color.White); //清空图片背景色 for (int i = 0; i < verifyCode.Length; i++)
{
brush = new LinearGradientBrush(new Point(0, 0), new Point(1, 1), Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)), 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 Pen(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, Color.FromArgb(random.Next()));
}
g.DrawRectangle(new Pen(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)
{
Font font = new Font("Arial", 14, (FontStyle.Bold | FontStyle.Italic));
Brush brush;
Bitmap bitmap = new Bitmap(width, height);
Graphics g = Graphics.FromImage(bitmap);
SizeF totalSizeF = g.MeasureString(verifyCode, font);
SizeF curCharSizeF;
PointF startPointF = new PointF(0, (height - totalSizeF.Height) / 2);
Random random = new Random(); //随机数产生器g.Clear(Color.White); //清空图片背景色 for (int i = 0; i < verifyCode.Length; i++)
{
brush = new LinearGradientBrush(new Point(0, 0), new Point(1, 1), Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)), 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 Pen(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, Color.FromArgb(random.Next()));
}
g.DrawRectangle(new Pen(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
3.后台控制器根据请求返回相应图形数据
#region 验证码#region 混合验证码[HttpGet]public string MixVerifyCodeJson()
{string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.MixVerifyCode);var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);byte[] imgBt = CommonHelper.Bitmap2Byte(bitmap);string uuid = Guid.NewGuid().ToString();return CommonHelper.CodeJson(uuid, Convert.ToBase64String(imgBt));
}
[HttpGet]public IActionResult MixVerifyCode()
{string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.MixVerifyCode);var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);
MemoryStream stream = new MemoryStream();
bitmap.Save(stream, ImageFormat.Png);return File(stream.ToArray(), "image/png");
}#endregion#region 数字验证码[HttpGet]public string NumberVerifyCodeJson()
{string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.NumberVerifyCode);var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);byte[] imgBt = CommonHelper.Bitmap2Byte(bitmap);string uuid = Guid.NewGuid().ToString();return CommonHelper.CodeJson(uuid, Convert.ToBase64String(imgBt));
}
[HttpGet]public IActionResult NumberVerifyCode()
{string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.NumberVerifyCode);var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);
MemoryStream stream = new MemoryStream();
bitmap.Save(stream, ImageFormat.Png);return File(stream.ToArray(), "image/png");
}#endregion#region 字母验证码[HttpGet]public IActionResult 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);return File(stream.ToArray(), "image/png");
}
[HttpGet]public string AbcVerifyCodeJson()
{string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.AbcVerifyCode);var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);byte[] imgBt = CommonHelper.Bitmap2Byte(bitmap);string uuid = Guid.NewGuid().ToString();return CommonHelper.CodeJson(uuid, Convert.ToBase64String(imgBt));
}#endregion#endregion
4.前端请求分为直接请求文件或json图形数据并渲染至Img标签
<script type="text/javascript">$(function () {
refreshNumJson();
refreshMixJson();
refreshAbcJson();
});
function refreshNum() {var id = document.getElementById("numImg");var str = "/Verify/NumberVerifyCode?random=" + Math.random();
id.setAttribute("src", str);
}
function refreshNumJson() {
$.ajax({
type: "get",
contentType: 'application/json',
url: '/Verify/NumberVerifyCodeJson?' + Math.random(),
dataType: 'json',async: false,
success: function (data) {
$("#numImgJson").attr("src", "data:image/png;base64," + data.msg);
console.log(data.code);
},
error: function (xhr) {
console.log(xhr.responseText);
}
});
}
function refreshMix() {var id = document.getElementById("mixImg");var str = "/Verify/MixVerifyCode?random=" + Math.random();
id.setAttribute("src", str);
}
function refreshMixJson() {
$.ajax({
type: "get",
contentType: 'application/json',
url: '/Verify/MixVerifyCodeJson?' + Math.random(),
dataType: 'json',async: false,
success: function (data) {
$("#mixImgJson").attr("src", "data:image/png;base64," + data.msg);
console.log(data.code);
},
error: function (xhr) {
console.log(xhr.responseText);
}
});
}
function refreshAbc() {var id = document.getElementById("abcImg");var str = "/Verify/AbcVerifyCode?random=" + Math.random();
id.setAttribute("src", str);
}
function refreshAbcJson() {
$.ajax({
type: "get",
contentType: 'application/json',
url: '/Verify/AbcVerifyCodeJson?' + Math.random(),
dataType: 'json',async: false,
success: function (data) {
$("#abcImgJson").attr("src", "data:image/png;base64," + data.msg);
console.log(data.code);
},
error: function (xhr) {
console.log(xhr.responseText);
}
});
}</script>
<h2>图形数字验证码</h2>
<img id="numImgJson" title="数字验证码Json获取" alt="vcode" style="cursor:pointer;" onclick="refreshNumJson()" />
<a href="javascript:void(0);" onclick="refreshNumJson()">看不清，换一张</a>
<img id="numImg" title="数字验证码" src="/Verify/NumberVerifyCode?random=1994" alt="vcode" style="cursor:pointer;" onclick="refreshNum()" />
<a href="javascript:void(0);" onclick="refreshNum()">看不清，换一张</a>
<h2>图形字母验证码</h2>
<img id="abcImgJson" title="图形字母验证码Json获取" alt="vcode" style="cursor:pointer;" onclick="refreshAbcJson()" />
<a href="javascript:void(0);" onclick="refreshAbcJson()">看不清，换一张</a>
<img id="abcImg" title="图形字母验证码" src="/Verify/AbcVerifyCode?random=1994" alt="vcode" style="cursor:pointer;" onclick="refreshAbc()" />
<a href="javascript:void(0);" onclick="refreshAbc()">看不清，换一张</a>
<h2>图形混合验证码</h2>
<img id="mixImgJson" title="图形混合验证码Json获取" alt="vcode" style="cursor:pointer;" onclick="refreshMixJson()" />
<a href="javascript:void(0);" onclick="refreshMixJson()">看不清，换一张</a>
<img id="mixImg" title="图形混合验证码" src="/Verify/MixVerifyCode?random=1994" alt="vcode" style="cursor:pointer;" onclick="refreshMix()" />
<a href="javascript:void(0);" onclick="refreshMix()">看不清，换一张</a>
5.效果如图
开源地址 动动小手，点个推荐吧！
注意：我们机遇屋该项目将长期为大家提供asp.net core各种好用demo，旨在帮助.net开发者提升竞争力和开发速度，建议尽早收藏该模板集合项目。
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