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; /** * Created by IntelliJ IDEA * 这是一个神奇的Class * * @author zhz * @date 2020/3/26 13:45 */ public class CheckPicCodeUtil { private static String picCode; public CheckPicCodeUtil() { } public static String getPicCode() { return picCode; } public static void setPicCode(String picCode) { CheckPicCodeUtil.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); } }
验证结果：
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参考：https://blog.csdn.net/Solder_Sun/article/details/81363117