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【Java】【web】验证码

【Java】【web】验证码

作者: JerichoPH | 来源:发表于2017-04-08 09:59 被阅读81次

    验证码

    public class CodeImg extends HttpServlet {
    
        public void doGet(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            int width = 110;
            int height = 25;
            // 在内存中创建一个图片
            BufferedImage img = new BufferedImage(width, height,
                    BufferedImage.TYPE_INT_RGB);
        
            // 创建画笔
            Graphics g = img.getGraphics();
        
            // 添加背景色
            g.setColor(Color.PINK);
            g.fillRect(1, 1, width - 2, height - 2);
        
            // 添加字样
            Random rm = new Random();
            g.setColor(Color.BLUE);
            g.setFont(new Font("宋体", Font.BOLD | Font.ITALIC, 18));
            int position = 20;
            for (int i = 0; i < 4; i++) {
                g.drawString(rm.nextInt(10) + "", position, 20);
                position += 20;
            }
        
            // 加入干扰线
            g.setColor(Color.BLACK);
            for (int i = 0; i < 9; i++) {
                g.drawLine(rm.nextInt(width), rm.nextInt(height), rm.nextInt(width), rm.nextInt(height));
            }
        
            // 以流的方式响应给客户端
            ImageIO.write(img, "jpg", response.getOutputStream());
        }
        
        public void doPost(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            this.doGet(request, response);
        }
    
    }
    

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