Java ＞验证码生成

public class Utils_Image {
    
    

    static int result_num = 0;
    // line_number ： 干扰线的数量
    public static BufferedImage createImage(Integer line_number) {
    
    
        result_num = 0;
        int width = 120;
        int height = 30;

        // 获取图片对象
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        // 获取画图工具
        Graphics graphics = bufferedImage.getGraphics();

        // 设置画笔颜色  并填满整个画板
        graphics.setColor(Color.WHITE);
        graphics.fillRect(0, 0, width, height);

        // 设置边框
        graphics.setColor(Color.RED);
        graphics.drawRect(0, 0, width - 1, height - 1);

        // 随机生成一个加法公式
        for (int i = 1; i <= 5; i++) {
    
    
            // 生成随机的Y轴数值
            int height_ran = new Random().nextInt(height / 4) + height / 2;
            // 生成随机的X轴数值
            int width_ran = new Random().nextInt((width / 5) / 2) + width / 5 * (i - 1);

            // 将 + 号写入图片
            if (i == 2) graphics.drawString("+", width_ran, height_ran);

            // 将加法所需的数字写入
            if (i == 1 || i == 3) {
    
    
                int i1 = new Random().nextInt(50) + 1;
                graphics.drawString(i1 + "", width_ran, height_ran);
                // 产生图片中加法的和
                result_num += i1;
            }

            // 将生成的 = 加入图片
            if (i == 4) graphics.drawString("=", width_ran, height_ran);
            if (i == 5) graphics.drawString("?", width_ran, height_ran);
        }

        // 生成随机干扰线
        for (int i = 0; i < line_number; i++) {
    
    
            // 随机生成随机的坐标点
            int start_width = 0;
            int start_height = 0;

            int end_width = 0;
            int end_height = 0;

            for (int j = 1; j <= 4; j++) {
    
    
                if (j % 2 == 0) {
    
    
                    start_width = new Random().nextInt(width);
                    end_width = new Random().nextInt(width);
                }
                if (j % 2 != 0) {
    
    
                    start_height = new Random().nextInt(height);
                    end_height = new Random().nextInt(height);
                }
            }

            // 将干扰线写入图片
            graphics.drawLine(start_width, start_height, end_width, end_height);
        }

        return bufferedImage;
    }
}