java 生成验证码图片

package Demo;

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

public class yzm {
    public static void main(String[] args) {
        Random rand = new Random();
        //写一个随机生成4为字符串的验证码
        String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ0123456789";
        StringBuffer a = new StringBuffer(4);
        for (int i = 0; i < 4; i++) {
            char c = str.charAt(rand.nextInt(str.length()));
            a.append(c);
        }
        int w = 160;
        int h = 60;
        BufferedImage s = new BufferedImage(w, h, 1);
        Graphics2D g = s.createGraphics();//开启画笔
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);//去锯齿
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, w, h);
        try {
            Font f = Font.createFont(Font.TRUETYPE_FONT, new File("C:\Users\86176\Desktop\ADKS____.TTF"));//设置字体
            for (int n = 0; n < a.length(); n++) {
                Font ff = f.deriveFont(Font.BOLD, rand.nextInt(20) + 35);//设置字体格式和大小
                g.setFont(ff);//取得字体
                int x = n * 30 + rand.nextInt(20) + 10;
                int y = rand.nextInt(10) + 30;
                String text = String.valueOf(a.toString().charAt(n));
                g.setColor(new Color(rand.nextInt(256), rand.nextInt(256), rand.nextInt(256), rand.nextInt(120) + 100));
                g.drawString(text, x, y);//写上验证码
                int x1 = 0;//x轴起点
                double y1 = 30;//y轴起点
                int yy = 30;//y轴的位置
                int hh = 30;//上下幅度
                int aa = 100;//波动频率
                //设置弧线
                for (x1 = 10;x1 <= 360;x1++){
                    y1 = (yy + hh * Math.sin(x1*Math.PI / aa));
                    g.drawLine(x1,(int)y1,x1,(int)y1);
                }
                //System.out.println(text);
            }
        } catch (FontFormatException | IOException e) {
            e.printStackTrace();
        }
        g.dispose();
        try {
            ImageIO.write(s,"jpg",new FileOutputStream("C:\Users\86176\Desktop\ABC.jpg"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}