EasyCaptcha验证码去掉干扰线、圈

import com.wf.captcha.SpecCaptcha;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
/**
 * @author vhukze
 * @date 2021/10/12 13:53
 */
public class CaptchaUtil extends SpecCaptcha {
    public CaptchaUtil(int width, int height, int len) {
        super(width, height, len);
    }
    @Override
    public boolean out(OutputStream out) {
        char[] strs = super.textChar();
        try {
            BufferedImage bi = new BufferedImage(this.width, this.height, 1);
            Graphics2D g2d = (Graphics2D) bi.getGraphics();
            g2d.setColor(Color.WHITE);
            g2d.fillRect(0, 0, this.width, this.height);
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
//            this.drawOval(2, g2d);
            g2d.setStroke(new BasicStroke(2.0F, 0, 2));
//            this.drawBesselLine(1, g2d);
            g2d.setFont(this.getFont());
            FontMetrics fontMetrics = g2d.getFontMetrics();
            int fW = this.width / strs.length;
            int fSp = (fW - (int) fontMetrics.getStringBounds("W", g2d).getWidth()) / 2;
            for (int i = 0; i < strs.length; ++i) {
                g2d.setColor(this.color());
                int fY = this.height - (this.height - (int) fontMetrics.getStringBounds(String.valueOf(strs[i]), g2d).getHeight() >> 1);
                g2d.drawString(String.valueOf(strs[i]), i * fW + fSp + 3, fY - 3);
            }
            g2d.dispose();
            ImageIO.write(bi, "png", out);
            out.flush();
            return true;
        } catch (IOException var18) {
            var18.printStackTrace();
        } finally {
            try {
                out.close();
            } catch (IOException var17) {
                var17.printStackTrace();
            }
        }
        return false;
    }
    @Override
    public String toBase64() {
        return super.toBase64();
    }
}