生成图片验证码工具类

首先绘制图片依赖 commons-codec-1.10.jar包，我已上传

package PicCheckCode;

import org.apache.commons.codec.binary.Base64;

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

public class CheckPicCode {
    private static String picCode;

    public static String getPicCode() {
        return picCode;
    }

    public static void setPicCode(String picCode) {
        CheckPicCode.picCode = picCode;
    }

    public static String getCheckCode(){
        //验证码中的字符由数字和大小写字母组成
        String code = "0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
        Random r = new Random();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < 4; i++) {
            sb.append(code.charAt(r.nextInt(code.length())));
        }

        return sb.toString();
    }

    public static BufferedImage showPic() throws IOException {
        String code=getCheckCode();
        setPicCode(code);
        int width=80;
        int height=30;
        BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
        Graphics g=image.getGraphics();
        g.setColor(Color.white);
        g.fillRect(0,0,width,height);
        Random r=new Random();
        for (int i=0;i<3;i++){
            g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));
            g.drawLine(r.nextInt(80),r.nextInt(30),r.nextInt(80),r.nextInt(80));
        }
        g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));
        g.setFont(new Font("黑体",Font.BOLD,24));
        g.drawString(code,15,20);
        g.dispose();//图像生效
        return image;
    }
    public static String encodeBase64ImgCode() throws IOException{
        BufferedImage codeImg=showPic();
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ImageIO.write(codeImg, "JPEG", out);
        byte[] b = out.toByteArray();
        String imgString = Base64.encodeBase64String(b);
        return "data:image/JPEG;base64," + imgString;
    }

    public static void main(String[] args) throws IOException {
        String base64PicCodeImage = encodeBase64ImgCode();
        String checkCode = getPicCode();
        System.out.println("验证码==》"+checkCode);
        System.out.println("base64图片字符串==》"+base64PicCodeImage);
    }
}

执行main方法，打印结果如下：

新建HTML网页

<html>
<img src="data:image/JPEG;base64,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">
</html>

打开HTML显示如下：

生成图片验证码工具类

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