📄 jsp彩色验证码.htm
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<a href="13004003160.html" target=_blank>JSP生成验证码源程序</a> [2005-04-11]<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彩色验证码</strong></td>
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<td height="40" align="right" valign="middle" bgcolor="#FFFFFF" style="word-break:break-all">作者：xiaohanne
文章来源：<a href="http://tech.ccidnet.com" target=_blank>tech.ccidnet.com</a><br>
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<iframe name="ad" frameborder=0 width=30 height=10 scrolling=no src=../count.jsp?news_id=3159></iframe>
次 加入时间：2005-04-10</td>
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<td height="623" align="left" valign="top" class="content">生成有4个随机数字和杂乱背景的图片，数字和背景颜色会改变，服务器端刷新（用history.go(-1)也会变） <br><br><strong>产生验证码图片的文件image.jsp</strong><br><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>Color getRandColor(int fc,int bc){//给定范围获得随机颜色<br> Random random = new Random();<br> if(fc>255) fc=255;<br> if(bc>255) bc=255;<br> int r=fc+random.nextInt(bc-fc);<br> int g=fc+random.nextInt(bc-fc);<br> int b=fc+random.nextInt(bc-fc);<br> return new Color(r,g,b);<br> }<br>%><br><%<br>//设置页面不缓存<br>response.setHeader("Pragma","No-cache");<br>response.setHeader("Cache-Control","no-cache");<br>response.setDateHeader("Expires", 0);<br><br>// 在内存中创建图象<br>int width=60, height=20;<br>BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);<br><br>// 获取图形上下文<br>Graphics g = image.getGraphics();<br><br>//生成随机类<br>Random random = new Random();<br><br>// 设定背景色<br>g.setColor(getRandColor(200,250));<br>g.fillRect(0, 0, width, height);<br><br>//设定字体<br>g.setFont(new Font("Times New Roman",Font.PLAIN,18));<br><br>//画边框<br>//g.setColor(new Color());<br>//g.drawRect(0,0,width-1,height-1);<br><br>// 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<br>g.setColor(getRandColor(160,200));<br>for (int i=0;i<155;i++)<br>{<br> int x = random.nextInt(width);<br> int y = random.nextInt(height);<br> int xl = random.nextInt(12);<br> int yl = random.nextInt(12);<br> g.drawLine(x,y,x+xl,y+yl);<br>}<br><br>// 取随机产生的认证码(4位数字)<br>String sRand="";<br>for (int i=0;i<4;i++){<br> String rand=String.valueOf(random.nextInt(10));<br> sRand+=rand;<br> // 将认证码显示到图象中<br> g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));<br>//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<br> g.drawString(rand,13*i+6,16);<br>}<br><br>// 将认证码存入SESSION<br>session.setAttribute("rand",sRand);<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>%></td></tr></table><br><br><br><strong>使用验证码图片的文件a.jsp </strong><br><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="text/html;charset=gb2312" %><br><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><br><html><br><head><br><title>认证码输入页面</title><br><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><br><META HTTP-EQUIV="Pragma" CONTENT="no-cache"> <br><META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> <br><META HTTP-EQUIV="Expires" CONTENT="0"> <br></head><br><body><br><form method=post action="check.jsp"><br><table><br><tr><br><td align=left>系统产生的认证码：</td><br><td><img border=0 src="image.jsp"></td><br></tr><br><tr><br><td align=left>输入上面的认证码：</td><br><td><input type=text name=rand maxlength=4 value=""></td><br></tr><br><tr><br><td colspan=2 align=center><input type=submit value="提交检测"></td><br></tr><br></form><br></body><br></html></td></tr></table><br><br><br><strong>验证的页面check.jsp</strong><br><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="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %><br><html><br><head><br><title>认证码验证页面</title><br><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><br><META HTTP-EQUIV="Pragma" CONTENT="no-cache"> <br><META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> <br><META HTTP-EQUIV="Expires" CONTENT="0"> <br></head><br><br><body><br><% <br> String rand = (String)session.getAttribute("rand");<br> String input = request.getParameter("rand");<br>%><br>系统产生的认证码为： <%= rand %><br><br>您输入的认证码为： <%= input %><br><br><br><br><%<br> if (rand.equals(input)) {<br>%><br><font color=green>输入相同，认证成功！</font><br><%<br> } else {<br>%><br><font color=red>输入不同，认证失败！</font><br><%<br> }<br>%><br></body><br></html></td></tr></table><br></td>
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