直接上代码记录一下

import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import org.apache.commons.lang3.StringUtils;
import org.springframework.mock.web.MockMultipartFile;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Random;public class QRCodeGenerator {// 定义二维码的宽高public static final int WIDTH = 300;public static final int HEIGHT = 300;// 定义头像的宽高public static final int AVATAR_WIDTH = 50;public static final int AVATAR_HEIGHT = 50;// 默认头像public static final String AVATAR_URL = "默认头像";public static final String HTTP = "http://";public static final String HTTPS = "https://";public static final String TOP = "图片存储默认前缀";public static final String PATH = "/opt/";public static final String PNG = ".png";public static final String FORMAT_NAME = "png";public static final String CONTENT_TYPE = "text/plain";public static QrcodeDto encodeReturn(String content, String avatarUrl) throws IOException, WriterException{if(StringUtils.isBlank(avatarUrl)) {avatarUrl = AVATAR_URL;}if (!avatarUrl.startsWith(HTTP) && !avatarUrl.startsWith(HTTPS)) {avatarUrl = TOP + avatarUrl;}if(avatarUrl.startsWith(HTTP)) {avatarUrl = avatarUrl.replace(HTTP, HTTPS);}String destPath = PATH;// 创建QRCodeWriter对象QRCodeWriter qrCodeWriter = new QRCodeWriter();// 创建二维码对象BitMatrix bitMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, WIDTH, HEIGHT);// 下载头像图片BufferedImage avatarImage = ImageIO.read(new URL(avatarUrl));// 将头像图片添加到二维码图片中BufferedImage bufferedImage = addAvatar(avatarImage, bitMatrix);// 判断文件是否存在if(!new File(destPath).exists()){new File(destPath).mkdirs();}String fileName = new Random().nextInt(99999999) + PNG;//生成随机文件名File file = new File(destPath + fileName);ImageIO.write(bufferedImage, FORMAT_NAME, file);FileInputStream fileInputStream = new FileInputStream(file);String fileName1 = file.getName();fileName = fileName1.substring((fileName1.lastIndexOf("/") + 1));QrcodeDto qrcodeDto = new QrcodeDto();qrcodeDto.setUrl(destPath + file);qrcodeDto.setFile(new MockMultipartFile(fileName, fileName, CONTENT_TYPE, fileInputStream));return qrcodeDto;}private static BufferedImage addAvatar(BufferedImage avatarImage, BitMatrix bitMatrix) {BufferedImage bitMatrixImage = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);// 开始绘制二维码图片for (int x = 0; x < WIDTH; x++) {for (int y = 0; y < HEIGHT; y++) {// 二维码图片颜色（RGB）bitMatrixImage.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);}}// 压缩头像图片Image image = resizeImage(avatarImage);// 计算头像图片的位置坐标int x = (WIDTH - AVATAR_WIDTH) / 2;int y = (HEIGHT - AVATAR_HEIGHT) / 2;// 将头像图片添加到二维码图片中Graphics2D graphics = bitMatrixImage.createGraphics();graphics.drawImage(image, x, y, AVATAR_WIDTH, AVATAR_HEIGHT, null);Shape shape = new RoundRectangle2D.Float(x, y, AVATAR_WIDTH, AVATAR_HEIGHT, 6, 6);graphics.setStroke(new BasicStroke(3f));graphics.draw(shape);graphics.dispose();return bitMatrixImage;}private static Image resizeImage(BufferedImage avatarImage) {Image image = avatarImage.getScaledInstance(AVATAR_WIDTH, AVATAR_HEIGHT, Image.SCALE_SMOOTH);BufferedImage bufferedImage = new BufferedImage(AVATAR_WIDTH, AVATAR_HEIGHT, BufferedImage.TYPE_INT_RGB);Graphics graphics = bufferedImage.getGraphics();graphics.drawImage(image, 0, 0, null);graphics.dispose();return image;}
}