验证码服务

public class CreateImageCode {

    // 图片高度
    private int width = 160;
    // 图片宽度
    private int height = 40;
    // 验证码字符个数
    private int codeCount = 4;
    // 验证码干扰线数
    private int lineCount = 20;
    // 验证码
    private String code;
    // 验证码图片Buffer
    private BufferedImage buffImg;
    Random random = new Random();

    public CreateImageCode() {
        createImage();
    }

    public CreateImageCode(int width, int height) {
        this.width = width;
        this.height = height;
        createImage();
    }

    public CreateImageCode(int width, int height, int codeCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        createImage();
    }

    public CreateImageCode(int width, int height, int codeCount, int lineCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        this.lineCount = lineCount;
        createImage();
    }

    private void createImage() {
        int fontWidth = width / codeCount; // 字体的宽度
        int fontHeight = height - 5; // 字体的高度
        int codeY = height - 8;

        // 图像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = buffImg.getGraphics();
        // 设置背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);
        // 设置字体
        Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
        g.setFont(font);

        // 设置干扰线
        for (int i = 0; i < lineCount; i++) {
            int xs = random.nextInt(width);
            int ys = random.nextInt(height);
            int xe = xs + random.nextInt(width);
            int ye = ys + random.nextInt(height);
            g.setColor(getRandColor(1, 255));
            g.drawLine(xs, ys, xe, ye);
        }

        // 添加躁点
        float yawpRate = 0.01f; // 噪声率
        int area = (int) (yawpRate * width * height);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            buffImg.setRGB(x, y, random.nextInt(255));
        }

        // 得到随机字符
        String str1 = randomStr(codeCount);
        this.code = str1;
        for (int i = 0; i < codeCount; i++) {
            String strRand = str1.substring(i, i + 1);
            g.setColor(getRandColor(1, 255));
            g.drawString(strRand, i * fontWidth + 3, codeY);
        }
    }

    // 得到随机字符
    private String randomStr(int n) {
        String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
        StringBuilder str2 = new StringBuilder();
        int len = str1.length() - 1;
        double r;
        for (int i = 0; i < n; i++) {
            r = (Math.random()) * len;
            str2.append(str1.charAt((int) r));
        }
        return str2.toString();
    }

    // 得到随机颜色
    private Color getRandColor(int fc, int bc) {
        if (fc > 255) fc = 255;
        if (bc > 255) bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }

    // 得到随机字体
    private Font getFont(int size) {
        Random random = new Random();
        Font[] fonts = new Font[5];
        fonts[0] = new Font("Ravie", Font.PLAIN, size);
        fonts[1] = new Font("Antique Olive Compact", Font.PLAIN, size);
        fonts[2] = new Font("Fixedsys", Font.PLAIN, size);
        fonts[3] = new Font("Wide Latin", Font.PLAIN, size);
        fonts[4] = new Font("Gill Sans Ultra Bold", Font.PLAIN, size);
        return fonts[random.nextInt(5)];
    }

    public void write(OutputStream sos) throws IOException {
        ImageIO.write(buffImg, "png", sos);
        sos.close();
    }

    public String getCode() {
        return code.toLowerCase();
    }
}

public class Constants {
    public static final Integer ZERO = 0;
    public static final String ZERO_STR = "0";
    public static final Integer LENGTH_5 = 5;
    public static final Integer LENGTH_10 = 10;
    public static final Integer LENGTH_15 = 15;
    public static final Integer LENGTH_20 = 20;
    public static final Integer LENGTH_50 = 50;
    public static final Integer LENGTH_150 = 150;
    public static final String CHECK_CODE_KEY = "check_code_key";
    public static final String CHECK_CODE_KEY_EMAIL = "check_code_key_email";
}

public interface EmailCodeService extends IService<EmailCode> {
    void checkCode(String email, String code);
}

@Service
public class EmailCodeServiceImpl extends ServiceImpl<EmailCodeMapper, EmailCode> implements EmailCodeService {
        @Override
    public void checkCode(String email, String code) {
        LambdaQueryWrapper<EmailCode> wrapper = new LambdaQueryWrapper<EmailCode>().eq(EmailCode::getEmail, email).eq(EmailCode::getCode, code);
        EmailCode one = this.getOne(wrapper);
        if (null == one) {
            throw new BizException("邮箱验证码错误");
        }
        ZoneId zoneId = ZoneId.systemDefault();
        long expire = System.currentTimeMillis() - one.getCreateTime().atZone(zoneId).toInstant().toEpochMilli();
        if (one.getStatus() == 1 || expire > Constants.LENGTH_15 * 60 * 1000) {
            throw new BizException("邮箱验证码已失效");
        }
        baseMapper.disableEmailCode(email);
    }
}

@GetMapping("/checkCode")
public void checkCode(HttpServletResponse response, HttpSession session, Integer type) throws IOException {
    CreateImageCode vCode = new CreateImageCode(130, 38, 5, 10);
    response.setHeader("Pragma", "no-cache");
    response.setHeader("Cache-Control", "no-cache");
    response.setDateHeader("Expires", 0);
    response.setContentType("image/jpeg");
    String code = vCode.getCode();
    if (type == null || type == 0) {
        session.setAttribute(Constants.CHECK_CODE_KEY, code);
    } else {
        session.setAttribute(Constants.CHECK_CODE_KEY_EMAIL, code);
    }
    vCode.write(response.getOutputStream());
}