📄 jsp生成验证码源程序.htm
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<a href="13004003159.html" target=_blank>JSP彩色验证码</a> [2005-04-10]<br></table></td>
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<td height="36" align="center" valign="middle" bgcolor="#FFFFFF" style="word-break:break-all" class="title"><strong>JSP生成验证码源程序</strong></td>
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<td height="40" align="right" valign="middle" bgcolor="#FFFFFF" style="word-break:break-all">作者：unkown
文章来源：<a href="http://www.csdn.net" target=_blank>www.csdn.net</a><br>
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<iframe name="ad" frameborder=0 width=30 height=10 scrolling=no src=../count.jsp?news_id=3160></iframe>
次 加入时间：2005-04-11</td>
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<td height="623" align="left" valign="top" class="content"><br><table bgcolor="#CCCCCC" bordercolor="#666666" borderColorDark="#CCCCCC" borderColorLight="#666666" width="100%" border="1" cellpadding="0" cellspacing="4"><tr><td align="left" style="WORD-BREAK: break-all"><%@ page contentType="image/jpeg" import="java.awt.*, <br>java.awt.image.*,java.util.*,javax.imageio.*" %> <br><% <br>// 在内存中创建图象 <br>int width=60, height=20; <br>BufferedImage image = new BufferedImage(width, height, <br>BufferedImage.TYPE_INT_RGB); <br><br>// 获取图形上下文 <br>Graphics g = image.getGraphics(); <br><br>// 设定背景色 <br>g.setColor(new Color(0xDCDCDC)); <br>g.fillRect(0, 0, width, height); <br><br>//画边框 <br>g.setColor(Color.black); <br>g.drawRect(0,0,width-1,height-1); <br><br>// 取随机产生的认证码(4位数字) <br>String rand = request.getParameter("rand"); <br>rand = rand.substring(0,rand.indexOf(".")); <br>switch(rand.length()) <br>{ <br>case 1: rand = "000"+rand; break; <br>case 2: rand = "00"+rand; break; <br>case 3: rand = "0"+rand; break; <br>default: rand = rand.substring(0,4); break; <br>} <br><br>// 将认证码存入SESSION <br>session.setAttribute("rand",rand); <br><br>// 将认证码显示到图象中 <br>g.setColor(Color.black); <br>Integer tempNumber = new Integer(rand); <br>String numberStr = tempNumber.toString(); <br><br>g.setFont(new Font("Atlantic Inline",Font.PLAIN,18)); <br>String Str = numberStr.substring(0,1); <br>g.drawString(Str,8,17); <br><br>Str = numberStr.substring(1,2); <br>g.drawString(Str,20,15); <br>Str = numberStr.substring(2,3); <br>g.drawString(Str,35,18); <br><br>Str = numberStr.substring(3,4); <br>g.drawString(Str,45,15); <br><br>// 随机产生88个干扰点，使图象中的认证码不易被其它程序探测到 <br>Random random = new Random(); <br>for (int i=0;i<20;i++) <br>{ <br>int x = random.nextInt(width); <br>int y = random.nextInt(height); <br>g.drawOval(x,y,0,0); <br>} <br><br>// 图象生效 <br>g.dispose(); <br><br>// 输出图象到页面 <br>ImageIO.write(image, "JPEG", response.getOutputStream()); <br>%><br></td></tr></table><br></td>
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<td height="53" align="left" valign="top"><a href="13004003159.html" target=_blank>JSP彩色验证码</a> [2005-04-10]<br></td>
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