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some utility class for java develop
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package com.star.captcha;

import com.star.common.RandomUtil;
import com.star.image.ImageUtil;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.concurrent.ThreadLocalRandom;

/**
 * 使用干扰线方式生成的图形验证码
 *
 * @author looly
 * @since 3.1.2
 */
public class LineCaptcha extends AbstractCaptcha {
    private static final long serialVersionUID = 8691294460763091089L;

    // -------------------------------------------------------------------- Constructor start

    /**
     * 构造，默认5位验证码，150条干扰线
     *
     * @param width  图片宽
     * @param height 图片高
     */
    public LineCaptcha(int width, int height) {
        this(width, height, 5, 150);
    }

    /**
     * 构造
     *
     * @param width     图片宽
     * @param height    图片高
     * @param codeCount 字符个数
     * @param lineCount 干扰线条数
     */
    public LineCaptcha(int width, int height, int codeCount, int lineCount) {
        super(width, height, codeCount, lineCount);
    }
    // -------------------------------------------------------------------- Constructor end

    @Override
    public void createImage(String code) {
        // 图像buffer
        image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        final ThreadLocalRandom random = ThreadLocalRandom.current();
        final Graphics2D g = ImageUtil.createGraphics(this.image, ImageUtil.randomColor(random));
        // 创建字体
        g.setFont(this.font);

        // 干扰线
        drawInterfere(g, random);

        // 文字
        int charWidth = width / (codeCount + 2);
        for (int i = 0; i < codeCount; i++) {
            // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
            g.setColor(ImageUtil.randomColor(random));
            g.drawString(String.valueOf(code.charAt(i)), i * charWidth + (charWidth >> 1), RandomUtil.randomInt(height >> 1) + (height >> 1));
        }
    }

    // ----------------------------------------------------------------------------------------------------- Private method start

    /**
     * 绘制干扰线
     *
     * @param g      {@link Graphics2D}画笔
     * @param random 随机对象
     */
    private void drawInterfere(Graphics2D g, ThreadLocalRandom random) {
        // 干扰线
        for (int i = 0; i < this.interfereCount; i++) {
            int xs = random.nextInt(width);
            int ys = random.nextInt(height);
            int xe = xs + random.nextInt(width / 8);
            int ye = ys + random.nextInt(height / 8);
            g.setColor(ImageUtil.randomColor(random));
            g.drawLine(xs, ys, xe, ye);
        }
    }
    // ----------------------------------------------------------------------------------------------------- Private method start
}