1.控制层

@Controller
public class VerifyController {/*** 生成验证码*/@RequestMapping(value = "/getVerify")public void getVerify(HttpServletRequest request, HttpServletResponse response) {try {// 设置相应类型,告诉浏览器输出的内容为图片response.setContentType("image/jpeg");// 设置响应头信息，告诉浏览器不要缓存此内容response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expire", 0);RandomValidateCodeUtil randomValidateCode = new RandomValidateCodeUtil();// 输出验证码图片方法randomValidateCode.getRandcode(request, response);} catch (Exception e) {}}
}

2.工具类

public class RandomValidateCodeUtil {public static final String RANDOMCODEKEY = "RANDOMVALIDATECODEKEY";// 放到session中的keyprivate 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;}
}