JAva生成ピクチャ検証コードツールクラス

package com.huawei.aip.general.codeUtil;

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

/**
 * @Author: liminghui
 * @Date: 2020/5/31 14:44
 * @Version:
 * @Description:
 */
public class VerifyCode {
    private int w = 70;
    private int h = 35;
    private Random r = new Random();
    // {"  ", "    ", "  ", "    ", "    ", "    ", "  _GB2312"}
    private String[] fontNames =
            { "  ", "    ", "  ", "    ", "  _GB2312" };
    //     
    private String codes = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";
    //    
    private Color bgColor = new Color(255, 255, 255);
    //        
    private String text;

    //        
    private Color randomColor() {
        int red = r.nextInt(150);
        int green = r.nextInt(150);
        int blue = r.nextInt(150);
        return new Color(red, green, blue);
    }

    //        
    private Font randomFont() {
        int index = r.nextInt(fontNames.length);
        String fontName = fontNames[index];//          
        int style = r.nextInt(4);//        , 0(   ), 1(  ), 2(  ), 3(  +  )
        int size = r.nextInt(5) + 24; //       , 24 ~ 28
        return new Font(fontName, style, size);
    }

    //     
    private void drawLine(BufferedImage image) {
        int num = 3;//    3 
        Graphics2D g2 = (Graphics2D) image.getGraphics();
        for (int i = 0; i < num; i++) {//         ， 4  
            int x1 = r.nextInt(w);
            int y1 = r.nextInt(h);
            int x2 = r.nextInt(w);
            int y2 = r.nextInt(h);
            g2.setStroke(new BasicStroke(1.5F));
            g2.setColor(Color.BLUE); //       
            g2.drawLine(x1, y1, x2, y2);//   
        }
    }

    //         
    private char randomChar() {
        int index = r.nextInt(codes.length());
        return codes.charAt(index);
    }

    //   BufferedImage
    private BufferedImage createImage() {
        BufferedImage image = new BufferedImage(w, h,
                BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = (Graphics2D) image.getGraphics();
        g2.setColor(this.bgColor);
        g2.fillRect(0, 0, w, h);
        return image;
    }

    // ！           
    public BufferedImage getImage() {
        BufferedImage image = createImage();//        
        Graphics2D g2 = (Graphics2D) image.getGraphics();//       
        StringBuilder sb = new StringBuilder();//             
        //      4   
        for (int i = 0; i < 4; i++) {//     ，        
            String s = randomChar() + "";//         
            sb.append(s); //       sb 
            float x = i * 1.0F * w / 4; //        x   
            g2.setFont(randomFont()); //       
            g2.setColor(randomColor()); //       
            g2.drawString(s, x, h - 5); //   
        }
        this.text = sb.toString(); //           this.text
        drawLine(image); //      
        return image;
    }

    //            
    public String getText() {
        return text;
    }

    //            
    public static void output(BufferedImage image, OutputStream out)
            throws IOException {
        ImageIO.write(image, "JPEG", out);
    }

    public static void main(String[] args) throws Exception {
        VerifyCode verifyCode = new VerifyCode();
        verifyCode.output(verifyCode.getImage(), new FileOutputStream("./img/test.jpg"));
        String str = verifyCode.getText();
        System.out.println(str);

    }
}