vue通过class获取dom_.NET Core通过Json或直接获取图形验证码（务必收藏备用）
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vue通过class获取dom_.NET Core通过Json或直接获取图形验证码（务必收藏备用）
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(給DotNet加星標，提升.Net技能)
轉自：殷慈航cnblogs.com/jiyuwu/p/11803979.html很多人寫的博客大家看了會一知半解，不知道怎么用，應該引用什么類庫或者代碼不全，這樣很多小白很是頭疼，尤其是嘗新技術更是如此。我們這邊不止告訴你步驟，而且還提供開源demo。
隨著時間的推移，我們的demo庫會日益強大請及時收藏
GitHub：https://github.com/jiyuwu/TemplateCore
一、首先你需要Nuget引用類庫
Install-Package ZKWeb.System.Drawing -Version 4.0.1二、創建公共類VerifyCodeHelper和CommonHelper
1、CommonHelper中添加圖形處理方法
#region 驗證碼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
public static string CodeJson(string code, string msg){
return "{\"code\":\"" + code + "\",\"msg\":\"" + msg + "\"}";
}
2、VerifyCodeHelper添加圖形處理方法
public class VerifyCodeHelper{
#region 單例模式
//創建私有化靜態obj鎖
private static readonly object _ObjLock = new object();
//創建私有靜態字段，接收類的實例化對象
private static VerifyCodeHelper _VerifyCodeHelper = null;
//構造函數私有化
private VerifyCodeHelper() { }
//創建單利對象資源并返回
public static VerifyCodeHelper GetSingleObj(){
if (_VerifyCodeHelper == null)
{
lock (_ObjLock)
{
if (_VerifyCodeHelper == null)
_VerifyCodeHelper = new VerifyCodeHelper();
}
}
return _VerifyCodeHelper;
}
#endregion
#region 生產驗證碼
public enum VerifyCodeType { NumberVerifyCode, AbcVerifyCode, MixVerifyCode };
///
/// 1.數字驗證碼
///
///
///
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;
}
//生成隨機數字
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);
}
//抽取隨機數字
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));
}
//生成驗證碼
for (int i = 0; i < length; i++)
{
validateNumberStr += validateNums[i].ToString();
}
return validateNumberStr;
}
///
/// 2.字母驗證碼
///
/// 字符長度
/// 驗證碼字符
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);
}
///
/// 3.混合驗證碼
///
/// 字符長度
/// 驗證碼字符
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);
}
///
/// 產生驗證碼(隨機產生4-6位)
///
/// 驗證碼類型：數字，字符，符合
///
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 驗證碼圖片
///
/// 驗證碼圖片 => Bitmap
///
/// 驗證碼
/// 寬
/// 高
/// Bitmap
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(); //隨機數產生器
g.Clear(Color.White); //清空圖片背景色
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;
}
//畫圖片的干擾線
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);
}
//畫圖片的前景干擾點
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); //畫圖片的邊框線
g.Dispose();
return bitmap;
}
///
/// 驗證碼圖片 => byte[]
///
/// 驗證碼
/// 寬
/// 高
/// byte[]
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(); //隨機數產生器
g.Clear(Color.White); //清空圖片背景色
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;
}
//畫圖片的干擾線
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);
}
//畫圖片的前景干擾點
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); //畫圖片的邊框線
g.Dispose();
//保存圖片數據
MemoryStream stream = new MemoryStream();
bitmap.Save(stream, ImageFormat.Jpeg);
//輸出圖片流
return stream.ToArray();
}
#endregion
三、后臺控制器根據請求返回相應圖形數據
#region 驗證碼#region 混合驗證碼
[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 數字驗證碼
[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 字母驗證碼
[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
四、前端請求分為直接請求文件或json圖形數據并渲染至Img標簽
<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>圖形數字驗證碼h2>
<img id="numImgJson" title="數字驗證碼Json獲取"alt="vcode" style="cursor:pointer;" onclick="refreshNumJson()" />
<a href="javascript:void(0);" onclick="refreshNumJson()">看不清，換一張a>
<img id="numImg" title="數字驗證碼" src="/Verify/NumberVerifyCode?random=1994"alt="vcode" style="cursor:pointer;" onclick="refreshNum()" />
<a href="javascript:void(0);" onclick="refreshNum()">看不清，換一張a>
<h2>圖形字母驗證碼h2>
<img id="abcImgJson" title="圖形字母驗證碼Json獲取"alt="vcode" style="cursor:pointer;" onclick="refreshAbcJson()" />
<a href="javascript:void(0);" onclick="refreshAbcJson()">看不清，換一張a>
<img id="abcImg" title="圖形字母驗證碼" src="/Verify/AbcVerifyCode?random=1994"alt="vcode" style="cursor:pointer;" onclick="refreshAbc()" />
<a href="javascript:void(0);" onclick="refreshAbc()">看不清，換一張a>
<h2>圖形混合驗證碼h2>
<img id="mixImgJson" title="圖形混合驗證碼Json獲取"alt="vcode" style="cursor:pointer;" onclick="refreshMixJson()" />
<a href="javascript:void(0);" onclick="refreshMixJson()">看不清，換一張a>
<img id="mixImg" title="圖形混合驗證碼" src="/Verify/MixVerifyCode?random=1994"alt="vcode" style="cursor:pointer;" onclick="refreshMix()" />
<a href="javascript:void(0);" onclick="refreshMix()">看不清，換一張a>
五、效果如圖
注意：我們機遇屋該項目將長期為大家提供ASP.NET Core各種好用demo，旨在幫助.NET開發者提升競爭力和開發速度，建議盡早收藏該模板集合項目。
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