using System.Collections.Generic
using System.Drawing
using System.Drawing.Drawing2D
using System.Drawing.Imaging
using System.IO
using System.Linq
using System.Web
using System.Web.Mvc
namespace News.Controllers
{
public class ImageCodeController : Controller
{
//
// GET: /ImageCode/
public ActionResult Index()
{
return View()
}
/// <summary>
/// 比较图片中的字符和用户输入的字符
/// </summary>
/// <param name="uCode"></param>
/// <returns></returns>
public string GetCodeResult(string uCode)
{
string oldcode = Session["oldcode"] as string
if (uCode.ToLower() == oldcode.ToLower())
{
return "yes"//用户输入正确
}
else
{
return "no"//用户输入错误
}
}
/// <summary>
/// 生成指定长度的字符串
/// </summary>
/// <returns></returns>
public ActionResult SecurityCode()
{
string code = CreateRandomCode(4)//验证码的字符为4个
Session["oldcode"] = code//生成后，存在session中，用于和用户输入的值比较
return File(CreateValidateGraphic(code), "image/Jpeg")
}
/// <summary>
/// 生成随机的字符串
/// </summary>
/// <param name="codeCount"></param>
/// <returns></returns>
public string CreateRandomCode(int codeCount)
{
string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,a,b,c,d,e,f,g,h,i,g,k,l,m,n,o,p,q,r,F,G,H,I,G,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,s,t,u,v,w,x,y,z"
string[] allCharArray = allChar.Split(',')
string randomCode = ""
int temp = -1
Random rand = new Random()
for (int i = 0i <codeCounti++)
{
if (temp != -1)
{
rand = new Random(i * temp * ((int)DateTime.Now.Ticks))
}
int t = rand.Next(35)
if (temp == t)
{
return CreateRandomCode(codeCount)
}
temp = t
randomCode += allCharArray[t]
}
return randomCode
}
/// <summary>
/// 创建验证码图片
/// </summary>
/// <param name="validateCode"></param>
/// <returns></returns>
public byte[] CreateValidateGraphic(string validateCode)
{
Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 16.0), 27)
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 = 0i <25i++)
{
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, x2, y1, y2)
}
Font font = new Font("Arial", 13, (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, 3, 2)
//画图片的前景干扰线
for (int i = 0i <100i++)
{
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), 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
return stream.ToArray()
}
finally
{
g.Dispose()
image.Dispose()
}
}
#endregion
}
}
----------------------控制器（上）------页面（下）-------------------------------
@{
Layout = null
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
<script src="~/js/jquery-1.7.2.min.js"></script>
</head>
<body>
<div>
<img src="/ImageCode/SecurityCode" id="imageclick" onclick="this.src=this.src+'?'" />
<input type="text" value="" id="uCode" />
<a href="javaScript:" id="click">确定</a>
</div>
</body>
</html>
<script type="text/javascript">
$("#click").click(function () {
//用户输入
var uCode = $.trim($("#uCode").val())
//图片中显示的
//获取点击图片后获取的值,并和用户输入的值进行比较
$.post("/ImageCode/GetCodeResult", { uCode: uCode }, function (data) {
if (data == "yes") {
alert("yes")
} else {
alert("验证码输入错误，请重新输入")
//$("#imageclick").click()//错误后，自动点击图片，生成下一个验证码（可选）
}
})
})
</script>
#include<time.h>#include<stdlib.h>
main()
{
char a[27]="abcdefghijklmnopqrstuvwxyz"//定义一个包含26个小写字母的字符串
int i,j char output[5]=""
srand((int)time(0))//初始化随机数发生器
for(i=0i<4i++)
{
j= rand()%26//取得0~25的随机数
printf("%c",a[j])//从字符串中随机取一个小写字母，并循环四次，获得四个随机的小写字母 output[i]=a[j]
}
}
<script>function yzm(){
var arr = ['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','0','1','2','3','4','5','6','7','8','9']
var str = ''
for(var i = 0 i < 4 i ++ )
str += ''+arr[Math.floor(Math.random() * arr.length)]
return str
}
</script>
<button onclick="document.getElementById('yzm').innerHTML = yzm()">重获验证码</button>
<div id="yzm"></div>
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