Google zxing 生成 QRcode

import com.google.zxing.BarcodeFormat;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

import java.io.OutputStream;

public class ZXingCodeUtil {

    public static void generatorCode(String url, OutputStream outputStream) throws Exception {

        QRCodeWriter qrCodeWriter = new QRCodeWriter();

        BitMatrix bitMatrix = qrCodeWriter.encode(url, BarcodeFormat.QR_CODE, 60, 60);

        MatrixToImageWriter.writeToStream(bitMatrix, "PNG", outputStream);
    }
}