验证码（一）
验证码（一）
1 @RequestMapping("/image") 2 public void image(HttpServletRequest request, HttpServletResponse response) throws IOException { 3 request.setCharacterEncoding("utf-8"); 4 5 BufferedImage bfi = new BufferedImage(80, 25, BufferedImage.TYPE_INT_RGB); 6 Graphics g = bfi.getGraphics(); 7 g.fillRect(0, 0, 80, 25); 8 9 //验证码字符范围 10 char[] ch = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789".toCharArray(); 11 Random r = new Random(); 12 int index; 13 StringBuffer sb = new StringBuffer(); //保存字符串 14 for (int i = 0; i < 4; i++) { 15 index = r.nextInt(ch.length); 16 g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255))); 17 Font font = new Font("宋体", 30, 20); 18 g.setFont(font); 19 g.drawString(ch[index] + "", (i * 20) + 2, 23); 20 sb.append(ch[index]); 21 } 22 23 // 添加噪点 24 int area = (int) (0.02 * 60 * 25); 25 for (int i = 0; i < area; ++i) { 26 int x = (int) (Math.random() * 80); 27 int y = (int) (Math.random() * 25); 28 bfi.setRGB(x, y, (int) (Math.random() * 255)); 29 } 30 31 //设置验证码中的干扰线 32 for (int i = 0; i < 3; i++) { 33 //随机获取干扰线的起点和终点 34 int xstart = (int) (Math.random() * 80); 35 int ystart = (int) (Math.random() * 25); 36 int xend = (int) (Math.random() * 80); 37 int yend = (int) (Math.random() * 25); 38 g.setColor(interLine(1, 255)); 39 g.drawLine(xstart, ystart, xend, yend); 40 } 41 HttpSession session = request.getSession(); //保存到session 42 session.setAttribute("verificationCode", sb.toString()); 43 ImageIO.write(bfi, "JPG", response.getOutputStream()); //写到输出流 44 } 45 46 private static Color interLine(int Low, int High) { 47 if (Low > 255) 48 Low = 255; 49 if (High > 255) 50 High = 255; 51 if (Low < 0) 52 Low = 0; 53 if (High < 0) 54 High = 0; 55 int interval = High - Low; 56 int r = Low + (int) (Math.random() * interval); 57 int g = Low + (int) (Math.random() * interval); 58 int b = Low + (int) (Math.random() * interval); 59 return new Color(r, g, b); 60 } 61 62 @RequestMapping("/checkCode") 63 @ResponseBody 64 public Map<String,Object> checkCode(String code,HttpSession session){ 65 Map<String,Object> map=new HashMap<>(); 66 67 String verificationCode = (String) session.getAttribute("verificationCode"); 68 if(verificationCode.equalsIgnoreCase(code)){ 69 map.put("valid",true); 70 }else{ 71 map.put("valid",false); 72 } 73 return map; 74 }
