数字验证码代码（验证码的代码）

今天给各位分享数字验证码代码的知识，其中也会对验证码的代码进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！

本文目录一览：

• 1、如何用Java代码段生成四位数字加字母的验证码？
• 2、利用c#语言生成四位数字的验证码的代码并详细注释
• 3、如何输入正确的数字字符串验证码

如何用Java代码段生成四位数字加字母的验证码？

不知道你问的是不是生成这种图片验证码？如果只要一个随机四位数 那这行代码就够了(new Random().nextInt(9000) + 1000;),如果是生成页面图片验证码就是下面的了: //设定 响应模式 resp.setContentType("image/jpeg"); // 生成令牌环数据; Integer token = new Random().nextInt(9000) + 1000; // 保存令牌环数据到session中 req.getSession().setAttribute(IMAGE_TOKEN_NAME, token); // 生成令牌环图片 ServletOutputStream out = resp.getOutputStream(); BufferedImage img = new BufferedImage(60, 20, BufferedImage.TYPE_INT_RGB); Graphics g = img.getGraphics(); g.setColor(Color.YELLOW); g.fillRect(0, 0, img.getWidth(), img.getHeight()); g.setColor(Color.BLUE); g.setFont(new Font("", Font.BOLD, 18)); g.drawString(String.valueOf(token), 10, 16); ImageIO.write(img, "jpg", out); out.close();

下面简单的介绍他们的功能和用途，执行效率等。每个都有各自的优缺点看你是做甚什么方面的研究开发用。.net，是网站编程，现在很多都用这个，但是这个语言编程都有统一思路，很好掌握。窒息那个效率不是很高；php 支持跨平台，很容易学会，执行的效率很高；asp是ASP.net的前身，它比较稳定，比.net要弱一点。但是比.net好学。jsp 是网页编程，这个学习大约一周就能搞定，不过这个得多实践，不然的话，时间长了，就容易忘记。

我自己做的系统里面用作验证码的JSP的%@page contentType="image/jpeg;charset=utf-8"%%@page import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*" %%@ page import="java.io.OutputStream" %html body %! Color getRandColor(int fc,int bc) { Random rd=new Random(); if(fc255) fc=255; if(bc255) bc=255; int red=fc+rd.nextInt(bc-fc); int green=fc+rd.nextInt(bc-fc); int blue=fc+rd.nextInt(bc-fc); return new Color(red,green,blue); } % % Random r=new Random(); response.addHeader("Pragma","No-cache"); response.addHeader("Cache-Control","no-cache"); response.addDateHeader("expires",0); int width=90; int height=23; BufferedImage pic=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics gc=pic.getGraphics(); gc.setColor(getRandColor(200,250)); gc.fillRect(0,0,width,height); String[] rNum ={"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","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"}; int[] style = {Font.PLAIN,Font.BOLD,Font.ITALIC,Font.PLAIN+Font.BOLD, Font.BOLD+Font.ITALIC,Font.PLAIN+Font.ITALIC,Font.PLAIN+Font.BOLD+Font.ITALIC}; gc.setColor(Color.WHITE); gc.drawLine(0,30,90,10); gc.setColor(getRandColor(160,200)); for (int i=0;i50;i++) { int x = r.nextInt(width); int y = r.nextInt(height); int xl = r.nextInt(10); int yl = r.nextInt(10); gc.drawLine(x,y,x+xl,y+yl); } gc.setColor(getRandColor(60,150)); String rt = ""; for(int i=0;i4;i++){ String temp = rNum[r.nextInt(62)]; rt = rt+temp; gc.setFont(new Font("Times New Roman",style[r.nextInt(7)],15)); gc.drawString(temp,5+i*15+r.nextInt(10),10+r.nextInt(10)); } gc.dispose(); session.setAttribute("randNum",rt); OutputStream os=response.getOutputStream(); ImageIO.write(pic,"JPEG",os); System.out.println("当前验证码为:"+session.getAttribute("randNum")); os.flush(); os.close(); os=null; response.flushBuffer(); out.clear(); out = pageContext.pushBody(); % /body/html

利用c#语言生成四位数字的验证码的代码并详细注释

public byte[] GetVerifyCode(string code)

{

int codeW = 80;

int codeH = 30;

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" };

//验证码的字符集，去掉了一些容易混淆的字符

char[] character = { '1', '2', '3', '4', '5', '6', '7', '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、验证码加密

WebHelper.WriteSession(code, Md5.md5(chkCode.ToLower(), 16));

//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 3; 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, (float)0);

}

//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);

return ms.ToArray();

}

catch (Exception)

{

return null;

}

finally

{

g.Dispose();

bmp.Dispose();

}

}

如何输入正确的数字字符串验证码

纯数字验证码的时候用到的，整理如下：

复制代码 代码如下:

$('#mobile-vcode').unbind();

$("#mobile-vcode").bind("keyup change",function () {

$(this).val($(this).val().replace(/\D/g,''));

if($(this).val().length==4){

/*ajax检测验证码是否正确，正确则激活按钮*/

}

});

数字验证码代码的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于验证码的代码、数字验证码代码的信息别忘了在本站进行查找喔。