<!-- 引入jar包 -->
	<dependency>
	  <groupId>com.google.zxing</groupId>
	  <artifactId>javase</artifactId>
	  <version>3.0.0</version>
	</dependency>

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * <p>
 * 生成二维码的工具类
 * </p>
 * 
 * @author lg
 * @date 2020年12月15日
 */
public class QRCodeUtils {

	/**
	 * 生成二维码
	 * 
	 * @param content 二维码的内容
	 * @return BitMatrix对象
	 * 
	 */
	public static BitMatrix createCode(String content) throws IOException {
		// 二维码的宽高
		int width = 200;
		int height = 200;
		// 其他参数，如字符集编码
		Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
		hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
		// 容错级别为H
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
		// 白边的宽度，可取0~4
		hints.put(EncodeHintType.MARGIN, 1);
		BitMatrix bitMatrix = null;
		try {
			// 生成矩阵，业务场景传来的是编码之后的URL，所以先解码
			bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
			// bitMatrix = deleteWhite(bitMatrix);
		} catch (WriterException e) {
			e.printStackTrace();
		}
		return bitMatrix;
	}
	/**
	 * 删除生成的二维码周围的白边，根据审美决定是否删除
	 * 
	 * @param matrix BitMatrix对象
	 * @return BitMatrix对象
	 */
	private static BitMatrix deleteWhite(BitMatrix matrix) {
		int[] rec = matrix.getEnclosingRectangle();
		int resWidth = rec[2] + 1;
		int resHeight = rec[3] + 1;
		BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
		resMatrix.clear();
		for (int i = 0; i < resWidth; i++) {
			for (int j = 0; j < resHeight; j++) {
				if (matrix.get(i + rec[0], j + rec[1]))
					resMatrix.set(i, j);
			}
		}
		return resMatrix;
	}
}

	//生成二维码
	ByteArrayOutputStream bos = new ByteArrayOutputStream();
    //二维码内容
    String content = "";
    //获取一个二维码图片
    BitMatrix bitMatrix = QRCodeUtils.createCode(content);
    //以流的形式输出到前端
    MatrixToImageWriter.writeToStream(bitMatrix , "jpg" , bos);
    String suffix = ".jpg";
    //图片上传 
	String url = localStorageService.fileUpload(bos.toByteArray(), suffix);

图片上传接口 请查看之前的文章 <springboot文件上传>