相关 jar 包：

core-3.1.0.jar

源码及 jar 包下载：https://files.cnblogs.com/files/xsl1995/QrCode.zip

package xsl.mf.utils; import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.io.OutputStream;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.Map; import javax.imageio.ImageIO;import javax.swing.filechooser.FileSystemView; import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatWriter;import com.google.zxing.common.BitMatrix; public class QrCodeUtil {     public static void main(String[] args) {        String url = "http://baidu.com";        String path = FileSystemView.getFileSystemView().getHomeDirectory() + File.separator + "testQrcode";        String fileName = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()) + ".jpg";        createQrCode(url, path, fileName);    }     public static String createQrCode(String url, String path, String fileName) {        try {            Map
     
       hints = new HashMap<>();            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 400, 400, hints);            File file = new File(path, fileName);            if (file.exists() || ((file.getParentFile().exists() || file.getParentFile().mkdirs()) && file.createNewFile())) {                writeToFile(bitMatrix, "jpg", file);                System.out.println("搞定：" + file);            }         } catch (Exception e) {            e.printStackTrace();        }        return null;    }     static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {        BufferedImage image = toBufferedImage(matrix);        if (!ImageIO.write(image, format, file)) {            throw new IOException("Could not write an image of format " + format + " to " + file);        }    }     static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {        BufferedImage image = toBufferedImage(matrix);        if (!ImageIO.write(image, format, stream)) {            throw new IOException("Could not write an image of format " + format);        }    }     private static final int BLACK = 0xFF000000;    private static final int WHITE = 0xFFFFFFFF;     private static BufferedImage toBufferedImage(BitMatrix matrix) {        int width = matrix.getWidth();        int height = matrix.getHeight();        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);        for (int x = 0; x < width; x++) {            for (int y = 0; y < height; y++) {                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);            }        }        return image;    } }