一篇Java图片验证码生成的代码

package projectUtil;

/**
 * @author tian
 * @date 2019/4/1015:58
 */

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.GeneralPath;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

/**
 * 验证码生成器
 *
 */
public class PicUtil {
    // 图片的宽度。
    private int width = 120;
    // 图片的高度。
    private int height = 40;
    // 验证码字符个数
    private int codeCount = 6;
    // 验证码干扰线数
    private int lineCount = 3;
    // 验证码
    private String code = null;
    // 验证码图片Buffer
    private BufferedImage buffImg = null;

    private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'M', 'N', 'P', 'Q', 'R',
            'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '2', '3', '4', '5', '6', '7', '8', '9' };
    // 生成随机数
    private Random random = new Random();

    public PicUtil() {
        this.createCode();
    }

    /**
     *
     * @param width 图片宽
     * @param height 图片高
     */
    public PicUtil(int width, int height) {
        this.width = width;
        this.height = height;
        this.createCode();
    }

    /**
     *
     * @param width 图片宽
     * @param height 图片高
     * @param codeCount 字符个数
     * @param lineCount 干扰线条数
     */
    public PicUtil(int width, int height, int codeCount, int lineCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        this.lineCount = lineCount;
        this.createCode();
    }

    public void createCode() {
        int codeX = 0;
        int fontHeight = 0;
        fontHeight = height - 5;// 字体的高度
        codeX = width / (codeCount + 3);// 每个字符的宽度

        // 图像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = buffImg.createGraphics();

        // 将图像填充为白色
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, width, height);

        // 创建字体
//        ImgFontByte imgFont = new ImgFontByte();
        Font font=new Font("宋体",Font.PLAIN,16);
        g.setFont(font);

        StringBuffer randomCode = new StringBuffer();
        // 随机产生验证码字符
        for (int i = 0; i < codeCount; i++) {
            String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
            // 设置字体颜色
            g.setColor(getRandomColor());
            // 设置字体位置
            g.drawString(strRand, (i + 1) * codeX, getRandomNumber(height / 2) + 20);
            randomCode.append(strRand);
        }
// 利用GeneralPath类来画曲线  
GeneralPath gp = new GeneralPath();
        gp.moveTo(0,0);


        for (int i = 0; i < lineCount; i++) {
// 绘制一个圆弧（弧线）
//            void drawArc(int x, int y, int width, int height, int startAngle, int arcAngle)
// 填充一个圆弧（扇形）
//            void fillArc(int x, int y, int width, int height, int startAngle, int arcAngle)
//            drawTanx(gp,g);
//            drawCosx(gp,g);
            drawSinx(gp,g);
            drawSinxDX(gp,g);
            // 设置字体颜色
            g.setColor(getRandomColor());
            //  绘制一个圆弧（弧线）
//            g.drawArc(lineCount*getRandomNumber(10), lineCount*getRandomNumber(10), width, height,getRandomNumber(100),lineCount*getRandomNumber(100)%2==1?-lineCount*getRandomNumber(360):lineCount*getRandomNumber(1872));
        }
        code = randomCode.toString();
    }

    /** 获取随机颜色 */
    private Color getRandomColor() {
        int r = getRandomNumber(255);
        int g = getRandomNumber(255);
        int b = getRandomNumber(255);
        return new Color(r, g, b);
    }

    /** 获取随机数 */
    private int getRandomNumber(int number) {
        return random.nextInt(number);
    }

    public void write(String path) throws IOException {
        OutputStream sos = new FileOutputStream(path);
        this.write(sos);
    }

    public void write(OutputStream sos) throws IOException {

        ImageIO.write(buffImg, "png", sos);
        sos.flush();
        sos.close();
    }

    public BufferedImage getBuffImg() {
        return buffImg;
    }

    public String getCode() {
        return code;
    }


    public static void main(String[] args) throws IOException {
        for (int i = 0; i <5 ; i++) {
            new PicUtil(){{
                this.write("D:/yy/"+super.code+".png");
            }};
        }

    }

        private void drawTanx(GeneralPath gp, Graphics2D g2d) {
            for (double i = 0.000001; i <= 8*Math.PI; i+=0.0001*Math.PI) {
                gp.lineTo(20*i, 100*-Math.tan(i));
            }
            g2d.draw(gp);

            // 将当前画笔以原点为中心，旋转180度，画奇函数（关于原点对称）
            g2d.rotate(Math.PI);
            g2d.draw(gp);
        }

        private void drawCosx(GeneralPath gp, Graphics2D g2d) {
            for (double i = 0.000001; i <= 8*Math.PI; i+=0.0001*Math.PI) {
                gp.lineTo(20*i, 100*-Math.cos(i));
            }
            g2d.draw(gp);

            // 将当前画笔以Y中为对称轴，画偶函数(关于Y轴对称)
            g2d.scale(-1, 1);
            g2d.draw(gp);
        }
        private void drawSinx(GeneralPath gp, Graphics2D g2d) {
            for (double i = 0.000001; i <= 8*Math.PI; i+=0.0001*Math.PI) {
                gp.lineTo(15*i, 100*-Math.sin(i));
            }
            g2d.draw(gp);
            g2d.rotate(Math.PI*0.01*getRandomNumber(100));
            g2d.draw(gp);
        }

        private void drawSinxDX(GeneralPath gp, Graphics2D g) {
            for (double i = 0.1; i <= 8*Math.PI; i+=0.0001*Math.PI) {
                gp.lineTo(20*i, -100*-Math.sin(i)/i);
            }
            g.draw(gp);
            g.scale(-1, 1);
            g.draw(gp);
        }

    }

网上有类似的代码，但独独只有生成的文字没有干扰线。所以花了点时间完善了一下，发上来，如果有需要请拿走。