生成验证码（存放在session）自己可以改成存放redis

@Controller public class VerifyController { /** * 生成验证码 */ @RequestMapping(value = "/getVerify") public void getVerify(HttpServletRequest request, HttpServletResponse response) { try { response.setContentType("image/jpeg");// 设置相应类型,告诉浏览器输出的内容为图片 response.setHeader("Pragma", "No-cache");// 设置响应头信息，告诉浏览器不要缓存此内容 response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expire", 0); RandomValidateCodeUtil randomValidateCode = new RandomValidateCodeUtil(); randomValidateCode.getRandcode(request, response);// 输出验证码图片方法 } catch (Exception e) { } } } public class RandomValidateCodeUtil { public static final String RANDOMCODEKEY = "RANDOMVALIDATECODEKEY";// 放到session中的key private String randString = "0123456789";// 随机产生只有数字的字符串 private String // private String randString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生只有字母的字符串 // private String randString = // "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串 private int width = 95;// 图片宽 private int height = 25;// 图片高 private int lineSize = 40;// 干扰线数量 private int stringNum = 4;// 随机产生字符数量 private static final Logger logger = LoggerFactory.getLogger(RandomValidateCodeUtil.class); private Random random = new Random(); /** * 获得字体 */ private Font getFont() { return new Font("Fixedsys", Font.CENTER_BASELINE, 18); } /** * 获得颜色 */ private Color getRandColor(int fc, int bc) { if (fc > 255) fc = 255; if (bc > 255) bc = 255; int r = fc + random.nextInt(bc - fc - 16); int g = fc + random.nextInt(bc - fc - 14); int b = fc + random.nextInt(bc - fc - 18); return new Color(r, g, b); } /** * 生成随机图片 */ public void getRandcode(HttpServletRequest request, HttpServletResponse response) { HttpSession session = request.getSession(); // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR); Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作 g.fillRect(0, 0, width, height);// 图片大小 g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));// 字体大小 g.setColor(getRandColor(110, 133));// 字体颜色 // 绘制干扰线 for (int i = 0; i <= lineSize; i++) { drowLine(g); } // 绘制随机字符 String randomString = ""; for (int i = 1; i <= stringNum; i++) { randomString = drowString(g, randomString, i); } logger.info(randomString); // 将生成的随机字符串保存到session中 session.removeAttribute(RANDOMCODEKEY); session.setAttribute(RANDOMCODEKEY, randomString); g.dispose(); try { // 将内存中的图片通过流动形式输出到客户端 ImageIO.write(image, "JPEG", response.getOutputStream()); } catch (Exception e) { logger.error("将内存中的图片通过流动形式输出到客户端失败>>>> ", e); } } /** * 绘制字符串 */ private String drowString(Graphics g, String randomString, int i) { g.setFont(getFont()); g.setColor(new Color(random.nextInt(101), random.nextInt(111), random.nextInt(121))); String rand = String.valueOf(getRandomString(random.nextInt(randString.length()))); randomString += rand; g.translate(random.nextInt(3), random.nextInt(3)); g.drawString(rand, 13 * i, 16); return randomString; } /** * 绘制干扰线 */ private void drowLine(Graphics g) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt(13); int yl = random.nextInt(15); g.drawLine(x, y, x + xl, y + yl); } /** * 获取随机的字符 */ public String getRandomString(int num) { return String.valueOf(randString.charAt(num)); } public static Boolean checkVerify(String verifiCode, HttpSession httpSession) { if (StringUtils.isEmpty(verifiCode)) { return false; } String random = (String) httpSession.getAttribute("RANDOMVALIDATECODEKEY"); if (StringUtils.isEmpty(random)) { return false; } if (!random.equals(verifiCode)) { return false; } return true; } }