controller:
1 2 /** 3 * 获取登录的验证码 4 * @param request 5 * @param response 6 */ 7 public void getLoginCode(HttpSession session,HttpServletRequest request, 8 HttpServletResponse response) throws Exception{ 9 // 获取验证码以及图片 10 Map<String,Object> map = CodeUtil.generateCodeAndPic(); 11 // 将验证码存入Session 12 session.setAttribute("imageCode",map.get("code")); 13 // 获取图片 14 BufferedImage image = (BufferedImage) map.get("codePic"); 15 // 转成base64 16 BASE64Encoder encoder = new BASE64Encoder(); 17 ByteArrayOutputStream baos = new ByteArrayOutputStream();//io流 18 ImageIO.write(image, "png", baos);//写入流中 19 byte[] bytes = baos.toByteArray();//转换成字节 20 String png_base64 = encoder.encodeBuffer(bytes).trim();//转换成base64串 21 //删除 22 png_base64 = png_base64.replaceAll(" ", "").replaceAll(" ", ""); 23 Map<String,String> maps = new HashMap<>(); 24 maps.put("code","" + map.get("code")); 25 maps.put("address",png_base64); 26 JSONObject jsonObject = JSONObject.fromObject(maps); 27 PrintWriter writer = response.getWriter(); 28 writer.print(jsonObject); 29 writer.flush(); 30 writer.close(); 31 }
private static int width = 180; private static int height = 40; private static int codeCount = 4; private static int xx = 30; private static int fontHeight = 36; private static int codeY = 32; private static char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }; /** * 生成验证码图片 * @return */ public static Map<String,Object> generateCodeAndPic(){ //定义图像buffer BufferedImage bufferedImage = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics graphics = bufferedImage.getGraphics(); //创建一个随机数类 Random random = new Random(); // 将图像填充为白色 graphics.setColor(Color.WHITE); // 填充图像 graphics.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("Fixedsys", Font.BOLD, fontHeight); // 设置字体 graphics.setFont(font); // 画边框 graphics.setColor(Color.black); graphics.drawRect(0,0,width-1,height-1); // 随机产生30条干扰线，让图形码不便于被其他程序检测到 graphics.setColor(Color.black); for (int i=0;i<30;i++){ int x = random.nextInt(width); int y = random.nextInt(height); int x1 = random.nextInt(12); int y1 = random.nextInt(12); graphics.drawLine(x,y,x + x1,y + y1); } // randomCode用于保存随机生成的二维码，便于用户登录时验证 StringBuffer randomCode = new StringBuffer(); int red = 0, green=0,blue = 0; // 随机产生codeCount数字的验证码 for (int i =0;i<codeCount;i++){ // 得到随机的验证码数字 String code = String.valueOf(codeSequence[random.nextInt(36)]); // 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色都不一样 red = random.nextInt(255); blue = random.nextInt(255); green = random.nextInt(255); // 用随机产生的颜色将验证码放到图像中 graphics.setColor(new Color(red,green,blue)); graphics.drawString(code,(i + 1) * xx,codeY); // 将产生的四个随机数组合在一起 randomCode.append(code); } Map<String,Object> map = new HashMap<>(); // 存放验证码 map.put("code",randomCode); // 存放生成的验证码BufferedImage对象 map.put("codePic",bufferedImage); return map; }