验证码-蒲公英云

验证码

r囧r小猫 2022-07-16 08:28 301阅读 0赞

验证码的验证是我们登陆网页时经常进行的操作，我也做了一个简单的验证码，包括颜色以及噪线等等

@RequestMapping(value = "/Frame/VerifyCode", method = RequestMethod.GET)
    public @ResponseBody ModelAndView VerifyCode(HttpServletRequest request, HttpServletResponse response, HttpSession httpSession) {
        int codeW = 80;
        int codeH = 22;
        int fontSize = 16;
        // 颜色列表，用于验证码、噪线、噪点
        Color[] color = { Color.BLACK, Color.RED, Color.BLUE, Color.GREEN, Color.ORANGE, Color.GRAY, Color.YELLOW };
        // 字体列表，用于验证码
        String[] font = { "Verdana" };
        // 验证码的字符集，去掉了一些容易混淆的字符
        String[] character = { "2", "3", "4", "5", "6", "8", "9", "a", "b", "d", "e", "f", "h", "k", "m", "n", "r", "x",
                "y", "A", "B", "C", "D", "E", "F", "G", "H", "J", "K", "L", "M", "N", "P", "R", "S", "T", "W", "X",
                "Y" };
        Random rnd = new Random();
        String chkCode[] = new String[4];
        // 生成验证码字符串
        for (int i = 0; i < 4; i++) {
            chkCode[i] = character[rnd.nextInt(character.length)];
        }
        // 创建画布
        BufferedImage image = new BufferedImage(codeW, codeH, BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();
        Color clr = color[rnd.nextInt(color.length)];
        // 设置背景色  
        g.setColor(Color.DARK_GRAY);
        g.setFont(new Font("Verdana",0,26));
        g.fillRect(0, 0, codeW, codeH);
        // g.setColor(clr);
        // 画噪线
        for (int i = 0; i < 1; i++) {
            int x1 = rnd.nextInt(codeW);
            int y1 = rnd.nextInt(codeH);
            int x2 = rnd.nextInt(codeW);
            int y2 = rnd.nextInt(codeH);
            clr = color[rnd.nextInt(color.length)];
            g.setColor(clr);
            g.drawLine(x1, y1, x2, y2);
        }
        String codeCheck = "";
        // 画验证码字符串
        for (int i = 0; i < chkCode.length; i++) {
            clr = color[rnd.nextInt(color.length)];
            g.setColor(clr);
            g.drawString(chkCode[i], 20*i, 20);
            codeCheck += chkCode[i];
        }
        OutputStream out = null;
        try {
            out = response.getOutputStream();
            ImageIO.write(image, "JPEG", out);
            out.flush();
            out.close();
            System.out.println("生成的验证码：code="+chkCode); 
            httpSession.setAttribute("SESSION_CHECKCODE", codeCheck);
        } 
        catch(Exception e)
        {
            e.printStackTrace();
        }
        return null;
    }