JSP登录页面包括验证码的验证

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<%@ 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>My JSP 'login.jsp' starting 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"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>  <%  String incode = (String)request.getParameter("code");   String rightcode = (String)session.getAttribute("rCode");     if(incode != null && rightcode != null){  if(incode.equals(rightcode)){  out.println("验证码输入正确！");  }else{  out.println("验证码输入不正确，请重新输入！");  }  }  %>    <body>  <form action="login.jsp" method="post">  用户名：  <input type="text" name="username"/><br/>  密码：  <input type="password" name="password"/><br/>  验证码：  <img src="number.jsp"/>  <input type="text" name="code"/>  <input type="submit" value="登录"/>  </form>  </body></html>

number.jsp提供了验证码的提取功能，如下：

<%@ page contentType="image/jpeg" language="java" import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*" pageEncoding="utf-8"%><%!Color getRandColor(int fc,int bc){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-catch");response.setDateHeader("Expires",0);//在内存中创建图象int width = 60;int height = 20;BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);//创建图象Graphics g = image.getGraphics();//生成随机对象Random random = new Random();//设置背景色g.setColor(getRandColor(200,250));g.fillRect(0,0,width,height);//设置字体g.setFont(new Font("Tines Nev Roman",Font.PLAIN,18));//随机产生干扰线g.setColor(getRandColor(160,200));for(int i = 0; i < 255; i++){int x = random.nextInt(width);int y = random.nextInt(height);int xl = random.nextInt(12);int yl = random.nextInt(12);}//随机产生认证码,4位数字String sRand = "";for(int i = 0; i < 4; i++){String rand = String.valueOf(random.nextInt(10));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)));g.drawString(rand,13*i+6,16);}session.setAttribute("rCode",sRand);//图像生效g.dispose();//输出图像到页面ImageIO.write(image,"JPEG",response.getOutputStream());out.clear();out = pageContext.pushBody();%>