步骤

maven依赖

    
      com.google.zxing
      javase
      3.3.0
    

工具类

package com.bennyrhys.mall.util;

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

import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;

/**
 * 描述：   生成二维码工具
 */
public class QRCodeGenerator {


  public static void generateQRCodeImage(String text, int width, int height, String filePath)
      throws WriterException, IOException {
    QRCodeWriter qrCodeWriter = new QRCodeWriter();
    BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height);
    Path path = FileSystems.getDefault().getPath(filePath);
    MatrixToImageWriter.writeToPath(bitMatrix, "PNG", path);
  }

  public static void main(String[] args) {
    try {
      generateQRCodeImage("Hello World", 350, 350, "E:/JAVA/mall/src/main/resources/images/QRTest.png");
    } catch (WriterException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

service

/**
   * 生成二维码
   * 图片可解析出访问的支付对应订单号的支付连接
   * @param orderNo 订单号
   * @return 返回图片地址
   */
  @Override
  public String qrcode(String orderNo) {
    ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    HttpServletRequest request = attributes.getRequest();

    String address = ip + ":" + request.getLocalPort();
    String payUrl = "http://" + address + "/pay?orderNo=" + orderNo;
    try {
      QRCodeGenerator.generateQRCodeImage(payUrl, 350, 350, Constant.FILE_UPLOAD_PATH + orderNo + ".png");
    } catch (WriterException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    String pngAddress = "http://" + address + "/images-dev/" + orderNo + ".png";
    return pngAddress;
  }

扩展

 局域网调试

线上调试

切换ip
# 指定IP(防止ip转发获取的是内网ip) file.upload.ip=127.0.0.1