验证码生成类

1.一般处理程序

/// 验证码生成类

/// </summary>

public class verify_code : IHttpHandler, IRequiresSessionState

{

public void ProcessRequest(HttpContext context)

{

int codeW = 80;

int codeH = 22;

int fontSize = 16;

string chkCode = string.Empty;

//颜色列表，用于验证码、噪线、噪点

Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue };

//字体列表，用于验证码

string[] font = { "Times New Roman", "Verdana", "Arial", "Gungsuh", "Impact" };

//验证码的字符集，去掉了一些容易混淆的字符

char[] character = { '2', '3', '4', '5', '6', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' };

Random rnd = new Random();

//生成验证码字符串

for (int i = 0; i < 4; i++)

{

chkCode += character[rnd.Next(character.Length)];

}

//写入Session

context.Session[DTKeys.SESSION_CODE] = chkCode;

//创建画布

Bitmap bmp = new Bitmap(codeW, codeH);

Graphics g = Graphics.FromImage(bmp);

g.Clear(Color.White);

//画噪线

for (int i = 0; i < 1; i++)

{

int x1 = rnd.Next(codeW);

int y1 = rnd.Next(codeH);

int x2 = rnd.Next(codeW);

int y2 = rnd.Next(codeH);

Color clr = color[rnd.Next(color.Length)];

g.DrawLine(new Pen(clr), x1, y1, x2, y2);

}

//画验证码字符串

for (int i = 0; i < chkCode.Length; i++)

{

string fnt = font[rnd.Next(font.Length)];

Font ft = new Font(fnt, fontSize);

Color clr = color[rnd.Next(color.Length)];

g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18 + 2, (float)0);

}

//画噪点

for (int i = 0; i < 100; i++)

{

int x = rnd.Next(bmp.Width);

int y = rnd.Next(bmp.Height);

Color clr = color[rnd.Next(color.Length)];

bmp.SetPixel(x, y, clr);

}

//清除该页输出缓存，设置该页无缓存

context.Response.Buffer = true;

context.Response.ExpiresAbsolute = System.DateTime.Now.AddMilliseconds(0);

context.Response.Expires = 0;

context.Response.CacheControl = "no-cache";

context.Response.AppendHeader("Pragma", "No-Cache");

//将验证码图片写入内存流，并将其以 "image/Png" 格式输出

MemoryStream ms = new MemoryStream();

try

{

bmp.Save(ms, ImageFormat.Png);

context.Response.ClearContent();

context.Response.ContentType = "image/Png";

context.Response.BinaryWrite(ms.ToArray());

}

finally

{

//显式释放资源 bmp.Dispose();

g.Dispose();

}

public bool IsReusable

{

get

{

return false;

}

2.页面使用

<dl>

<dd>

</a>

</dd>

</dl>

3.切换验证码

//切换验证码

function ToggleCode(obj, codeurl) {

$(obj).children("img").eq(0).attr("src", codeurl + "?time=" + Math.random());

}

4.MVC生成验证码

public class ValidateCode

{

public ValidateCode()

{

}

/// <summary>

/// 验证码的最大长度

/// </summary>

public int MaxLength

{

get { return 10; }

}

/// <summary>

/// 验证码的最小长度

/// </summary>

public int MinLength

{

get { return 1; }

}

/// <summary>

/// 生成验证码

/// </summary>

/// <param name="length">指定验证码的长度</param>

/// <returns></returns>

public string CreateValidateCode(int length,out string retInfo)

{

//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 = (int)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;

#region 字符数字随机

//StringBuilder sbcode = new StringBuilder();

//string strcode = "abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789";

//Random rand = new Random();

//for (int i = 0; i < length; i++)

//{

// sbcode.Append(strcode[rand.Next(0, strcode.Length)].ToString());

//}

//return sbcode.ToString(); #endregion

#region 验证码 +- 计算

string retcode="";

retInfo = "siweicn";

int seekSeek = unchecked((int)DateTime.Now.Ticks);

Random rand = new Random(seekSeek);

string stroper = "+*";

string oper = stroper[rand.Next(0, stroper.Length)].ToString();

string k1 = string.Empty;

string k2 = string.Empty;

switch (oper)

{

case "*":

{

k1 = rand.Next(1, 10).ToString();

k2 = rand.Next(1, 10).ToString();

retInfo = (int.Parse(k1) * int.Parse(k2)).ToString();

retcode = k1 + "* " + k2 + "=?";

break;

}

case "+":

{

k1 = rand.Next(1, 10).ToString();

k2 = rand.Next(1, 10).ToString();

retInfo = (int.Parse(k1) + int.Parse(k2)).ToString();

retcode = k1 + "+ " + k2 + "=?";

break;

}

return retcode;

#endregion

}

/// <summary>

/// 创建验证码的图片

/// </summary>

/// <param name="containsPage">要输出到的page对象</param>

/// <param name="validateNum">验证码</param>

public void CreateValidateGraphic(string validateCode)

{

//Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 13.0), 31);

Bitmap image = new Bitmap(82, 24);

Graphics g = Graphics.FromImage(image);

try

{

//生成随机生成器

Random random = new Random();

//清空图片背景色 g.Clear(Color.White);

//画图片的干扰线

for (int i = 0; i < 25; i++)

{

int x1 = random.Next(image.Width);

int x2 = random.Next(image.Width);

int y1 = random.Next(image.Height);

int y2 = random.Next(image.Height);

g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);

}

Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));

LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),

Color.Blue, Color.DarkRed, 1.2f, true);

g.DrawString(validateCode, font, brush, 0, 3);

//画图片的前景干扰点

for (int i = 0; i < 100; i++)

{

int x = random.Next(image.Width);

int y = random.Next(image.Height);

image.SetPixel(x, y, Color.FromArgb(random.Next()));

}

//画图片的边框线

g.DrawRectangle(new Pen(Color.Silver, 4), 0, 0, image.Width - 1, image.Height - 1);

//保存图片数据

MemoryStream stream = new MemoryStream();

image.Save(stream, ImageFormat.Jpeg);

//输出图片流 HttpContext.Current.Response.Clear();

HttpContext.Current.Response.ContentType = "image/jpeg";

HttpContext.Current.Response.BinaryWrite(stream.ToArray());

}

finally

{

g.Dispose();

image.Dispose();

}

/// <summary>

/// 得到验证码图片的长度

/// </summary>

/// <param name="validateNumLength">验证码的长度</param>

/// <returns></returns>

public static int GetImageWidth(int validateNumLength)

{

return (int)(validateNumLength * 12.0);

}

/// <summary>

/// 得到验证码的高度

/// </summary>

/// <returns></returns>

public static double GetImageHeight()

{

return 22.5;

}

5.控制器中创建验证码

[AllowAnonymous]

[OutputCache(Location = OutputCacheLocation.None)]

public void VCode()

{

var code = new ValidateCode();

string retInfo;

var codeStr = code.CreateValidateCode(5, out retInfo);

Session["vcode"] = retInfo;

code.CreateValidateGraphic(codeStr);

}

6.view页面使用验证码

<li>

验证码：

<img id="vcode"

alt="验证码" title="点击刷新验证码" src="@Url.Action("VCode", "控制器名称")" />

</li>

7.点击刷新重置验证码

$("#vcode").click(function () {

var $this = $(this);

$this.attr("src", '@Url.Action("VCode", "控制器名称")?_=' + new Date().getTime());

})

<?php

//验证码类

class ValidateCode {

private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子

private $code;//验证码

private $codelen = 4;//验证码长度

private $width = 130;//宽度

private $height = 50;//高度

private $img;//图形资源句柄

private $font;//指定的字体

private $fontsize = 20;//指定字体大小

private $fontcolor;//指定字体颜色

//构造方法初始化

public function __construct() {

$this->font = dirname(__FILE__).'/font/elephant.ttf';//注意字体路径要写对，否则显示不了图片

}

//生成随机码

private function createCode() {

$_len = strlen($this->charset)-1;

for ($i=0;$i<$this->codelen;$i++) {

$this->code .= $this->charset[mt_rand(0,$_len)];

}

//生成背景

private function createBg() {

$this->img = imagecreatetruecolor($this->width, $this->height);

$color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));

imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);

}

//生成文字

private function createFont() {

$_x = $this->width / $this->codelen;

for ($i=0;$i<$this->codelen;$i++) {

$this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));

imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);

}

//生成线条、雪花

private function createLine() {

//线条

for ($i=0;$i<6;$i++) {

$color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));

imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);

}

//雪花

for ($i=0;$i<100;$i++) {

$color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));

imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);

}

//输出

private function outPut() {

header('Content-type:image/png');

imagepng($this->img);

imagedestroy($this->img);

}

//对外生成

public function doimg() {

$this->createBg();

$this->createCode();

$this->createLine();

$this->createFont();

$this->outPut();

}

//获取验证码

public function getCode() {

return strtolower($this->code);

}

输出实例：

使用方法：

1、先把验证码类保存为一个名为 ValidateCode.class.php 的文件；

2、新建一个名为 captcha.php 的文件进行调用该类；

captcha.php

<?php

session_start();

require './ValidateCode.class.php'; //先把类包含进来，实际路径根据实际情况进行修改。

$_vc = new ValidateCode(); //实例化一个对象

$_vc->doimg();

$_SESSION['authnum_session'] = $_vc->getCode();//验证码保存到SESSION中

3、引用到页面中，代码如下：

4、一个完整的验证页面，代码如下：

<?php

session_start();

//在页首先要开启session,

//error_reporting(2047);

session_destroy();

//将session去掉，以每次都能取新的session值;

//用seesion 效果不错，也很方便

//by www.jbxue.com

<html>

<head>

<title>session 图片验证实例</title>

#login p{

margin-top: 15px;

line-height: 20px;

font-size: 14px;

font-weight: bold;

}

#login img{

cursor:pointer;

}

form{

margin-left:20px;

}

</style>

</head>

<body>

<p>此例为session验证实例</p>

<p>

</p>

<p>

</p>

</form>

<?php

//打印上一个session;

//echo "上一个session：<b>".$_SESSION["authnum_session"]."</b><br>";

$validate="";

if(isset($_POST["validate"])){

$validate=$_POST["validate"];

echo "您刚才输入的是：".$_POST["validate"]."<br>状态：";

if($validate!=$_SESSION["authnum_session"]){

//判断session值与用户输入的验证码是否一致;

echo "<font color=red>输入有误</font>";

}else{

echo "<font color=green>通过验证</font>";

}

本文链接：https://www.cnblogs.com/lovable/p/9187460.html

验证码生成类

验证码生成类

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