彩色验证码代码,Java代码库,德仔网

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【Java】彩色验证码
作者:dezai / 发布于2014/2/26/ 468
彩色验证码
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <base href="<%=basePath%>">
 
  <title>image page</title>
 
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0"> 
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
 

 </head>

 <body>
    <%@ page contentType="image/jpeg" import="java.awt.*,
    java.awt.image.*,java.util.*,javax.imageio.*,java.io.OutputStream" %>
    <%!
    Color getRandColor(int fc,int bc){//给定范围获得随机颜色
        Random random = new Random();
        if(fc>255) fc=255;
        if(bc>255) bc=255;
        int r=fc+random.nextInt(bc-fc);
        int g=fc+random.nextInt(bc-fc);
        int b=fc+random.nextInt(bc-fc);
        return new Color(r,g,b);
        }
    %>
    <%
    //设置页面不缓存
    response.setHeader("Pragma","No-cache");
    response.setHeader("Cache-Control","no-cache");
    response.setDateHeader("Expires", 0);
   
    // 在内存中创建图象
    int width=60, height=20;
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
   
    // 获取图形上下文
    Graphics g = image.getGraphics();
   
    //生成随机类
    Random random = new Random();
   
    // 设定背景色
    g.setColor(getRandColor(200,250));
    g.fillRect(0, 0, width, height);
   
    //设定字体
    g.setFont(new Font("Times New Roman",Font.PLAIN,18));
   
    //画边框
    //g.setColor(new Color());
    //g.drawRect(0,0,width-1,height-1);
   
    // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
    g.setColor(getRandColor(160,200));
    for (int i=0;i<155;i++)
    {
    int x = random.nextInt(width);
    int y = random.nextInt(height);
        int xl = random.nextInt(12);
        int yl = random.nextInt(12);
    g.drawLine(x,y,x+xl,y+yl);
    }
   
    // 取随机产生的认证码(4位数字)
    String sRand="";
    String randString = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    for (int i=0;i<4;i++){
     //String rand=String.valueOf(random.nextInt(10));
      String rand = String.valueOf(randString.charAt(random.nextInt(61)));
      sRand+=rand;
      // 将认证码显示到图象中
      g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
     //调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
      g.drawString(rand,13*i+6,16);
    }
   
    // 将认证码存入SESSION
    session.setAttribute("rand",sRand);
   
    // 图象生效
    g.dispose();
   
    // 输出图象到页面
    OutputStream output=response.getOutputStream();
    ImageIO.write(image, "JPEG", output);
    output.flush();
    out.clear();
    out = pageContext.pushBody();
    %>
 </body>
</html>
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