生成随机验证码图片的Jsp页面代码

glaringsun 贡献于2014-02-24

作者 DongXiaoXiong  创建于2014-01-13 07:57:00   修改者DongXiaoXiong  修改于2014-01-13 07:59:00字数2794

文档摘要:生成随机验证码图片的Jsp页面代码
关键词:

image.jsp------------------------------生成随机验证码图片的Jsp页面 代码如下: <%@ page contentType="image/jpeg" import="java.awt.*, java.awt.image.*,java.util.*,javax.imageio.*" %> <%! 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); } %> <% out.clear();//这句针对resin服务器,如果是tomacat可以不要这句 response.setHeader("Pragma","No-cache"); response.setHeader("Cache-Control","no-cache"); response.setDateHeader("Expires", 0); int width=60, height=20; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); Random random = new Random(); g.setColor(getRandColor(200,250)); g.fillRect(0, 0, width, height); g.setFont(new Font("Times New Roman",Font.PLAIN,18)); 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); } String sRand=""; for (int i=0;i<4;i++){ String rand=String.valueOf(random.nextInt(10)); sRand+=rand; g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110))); g.drawString(rand,13*i+6,16); } // 将认证码存入SESSION session.setAttribute("rand",sRand); g.dispose(); ImageIO.write(image, "JPEG", response.getOutputStream()); %> logic.jsp--------------------------------登陆页面,在这里提供输入验证码然后提交并验证 代码如下: <%@ page contentType="text/html;charset=gbk" %> <%@ page language="java" import="java.sql.*" errorPage="" %> 用户登录
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validate.jsp--------------------------用来验证输入的验证码是否正确 代码如下: <%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %> <% String rand = (String)session.getAttribute("rand"); String input = request.getParameter("rand"); if(rand.equals(input)){ out.print(""); } else{ out.print(""); } %>

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