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。