Jsp页面验证码的生成方法

%int width = 60;int height = 20;/ 创建具有可访问图像数据缓冲区的ImageBufferedImage buffImg = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);Graphics2D g = buffImg.createGraphics();/ 创建一个随机数生成器Random random = new Random();g.setColor(Color.WHITE);g.fillRect(0, 0, width, height);/ 创建字体，字体的大小应该根据图片的高度来定Font font = new Font(Times New Roman, Font.PLAIN, 18);/ 设置字体g.setFont(font);/ 画边框g.setColor(Color.BLACK);g.drawRect(0, 0, width - 1, height - 1);/ 随机产生160条干扰线g.setColor(Color.LIGHT_GRAY);for (int i = 0; i 160; i+) int x = random.nextInt(width);int y = random.nextInt(height);int x1 = random.nextInt(12);int y1 = random.nextInt(12);g.drawLine(x, y, x + x1, y + y1);/ randomCode 用于保存随机产生的验证码StringBuffer randomCode = new StringBuffer();int red = 0, green = 0, blue = 0;/ 随机产生4位数字的验证码for (int i = 0; i Image.jsp的代码如下 255) fc=255; if(bc255) 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;i155;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;iLogic.jsp的代码如下用户登录function loadimage()document.getElementById(