效果圖

步驟

maven依賴

<!--    生成二維碼-->
    <dependency>
      <groupId>com.google.zxing</groupId>
      <artifactId>javase</artifactId>
      <version>3.3.0</version>
    </dependency>

工具類

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：   生成二維碼工具
 */
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,"E:/JAVA/mall/src/main/resources/images/QRTest.png");
    } catch (WriterException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

service

/**
   * 生成二維碼
   * 圖片可解析出訪問的支付對應訂單號的支付連線
   * @param orderNo 訂單號
   * @return 返回圖片地址
   */
  @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,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;
  }

擴充套件

區域網除錯

線上除錯

切換ip
# 指定IP(防止ip轉發獲取的是內網ip) file.upload.ip=127.0.0.1

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