验证码

r囧r小猫 2022-07-16 08:28 247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;
    	}