Java 微信当面付生成二维码支付实现

• 1. maven依赖
• 2. 准备工作
• • a. WxPayConfig 配置类
  • b. 二维码图片本地存储位置
  • c. 配置虚拟路径
• 3. 代码
• • a. QrCodeUtil
  • b. controller

1. maven依赖

<!-- 微信支付sdk -->
        <dependency>
            <groupId>com.github.wxpay</groupId>
            <artifactId>wxpay-sdk</artifactId>
            <version>0.0.3</version>
        </dependency>
        <!-- 二维码工具 -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.3.3</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.3.3</version>
        </dependency>
           

2. 准备工作

a. WxPayConfig 配置类

在第一篇关于微信支付文章里有写到：

Java 微信支付统一下单、支付回调、订单查询实现

这里直接用了

b. 二维码图片本地存储位置

file.qrCode是在配置文件里写到的二维码图片本地存储位置，

c. 配置虚拟路径

需要在项目里配置虚拟路径，

参考SpringBoot文件虚拟路径配置，

以及图片开放访问，有权限限制的项目需要这一步，项目不同开放的方式也不同，举例：

如果是分布式项目的话，集成MinIO来存储图片会更好，参考

Java MinIO文件上传返回访问路径及访问配置

3. 代码

a. QrCodeUtil

(同支付宝二维码支付)

import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Hashtable;

public class QrCodeUtil {
    /**
     * 生成包含字符串信息的二维码图片
     * @param outputStream 文件输出流路径
     * @param content 二维码携带信息
     */
    public static boolean createQrCode(OutputStream outputStream, String content) throws WriterException, IOException{
        //设置二维码纠错级别ＭＡＰ
        Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();
        hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);  // 矫错级别
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        //创建比特矩阵(位矩阵)的QR码编码的字符串
        BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, 900, 900, hintMap);
        // 使BufferedImage勾画QRCode  (matrixWidth 是行二维码像素点)
        int matrixWidth = byteMatrix.getWidth();
        BufferedImage image = new BufferedImage(matrixWidth-200, matrixWidth-200, BufferedImage.TYPE_INT_RGB);
        image.createGraphics();
        Graphics2D graphics = (Graphics2D) image.getGraphics();
        graphics.setColor(Color.WHITE);
        graphics.fillRect(0, 0, matrixWidth, matrixWidth);
        // 使用比特矩阵画并保存图像
        graphics.setColor(Color.BLACK);
        for (int i = 0; i < matrixWidth; i++){
            for (int j = 0; j < matrixWidth; j++){
                if (byteMatrix.get(i, j)){
                    graphics.fillRect(i-100, j-100, 1, 1);
                }
            }
        }
        return ImageIO.write(image, "JPEG", outputStream);
    }
}
           

b. controller

@Value("${file.qrCode}")
    private String qrCode;

    @PreAuthorize("@el.check('anonymous')")
    @PostMapping("/wxpayPrecreate")
    public ResponseEntity wxPrecreate(HttpServletRequest request, @RequestBody Map params) throws Exception {
        // 保存未支付订单
        ShopOrderDTO shopOrderDTO = createOrder(params, 0);

        // 处理请求参数
        WxPayConfig wxPayConfig = new WxPayConfig(shopDeviceService);
        WXPay wxPay = new WXPay(wxPayConfig);

        Map<String,String> data = new HashMap<>();
        data.put("out_trade_no", shopOrderDTO.getId()+"");   //订单编号
        data.put("total_fee",shopOrderDTO.getAmount().toString());   //金额(单位为分) int

        data.put("spbill_create_ip", IPUtil.getIPAddress(request));
        data.put("nonce_str", WXPayUtil.generateNonceStr());   // 随机字符串小于32位
        data.put("mch_id",wxPayConfig.getMchID());
        data.put("appid",wxPayConfig.getAppID());
		
		// 这里二维码支付是区别于手机网站支付的地方
        data.put("trade_type","NATIVE");	
        
        data.put("product_id", shopOrderDTO.getId().toString());

        data.put("device_info",wxPayConfig.getDeviceInfo());
        data.put("notify_url",wxPayConfig.getNotifyUrl());
        data.put("fee_type",wxPayConfig.getFeeType());
        data.put("body",wxPayConfig.getBody());
        data.put("scene_info", wxPayConfig.getSceneInfo());

        // 生成签名
        String s = WXPayUtil.generateSignature(data, wxPayConfig.getKey());
        data.put("sign",s);

        // 发起下单请求
        logger.info("发起 WxPay 下单请求");
        Map<String, String> respData = wxPay.unifiedOrder(data);

        // 处理下单结果
        if ("SUCCESS".equals(respData.get("return_code"))){
            if ("SUCCESS".equals(respData.get("result_code"))) {
                String path = qrCode + shopOrderDTO.getId() + "WXPay.jpg";
                String httpPath = "/qrCode/" + shopOrderDTO.getId() + "WXPay.jpg";
                File file = new File(path);
                if (!file.getParentFile().exists()) {
                    file.getParentFile().mkdirs();
                }
                QrCodeUtil.createQrCode(new FileOutputStream(file), respData.get("code_url"));
                respData.put("qrcode", httpPath);
                respData.put("out_trade_no", shopOrderDTO.getId()+"");

                shopLogService.anonymousCreate(shopLogService.getShopLog(shopOrderDTO.getStoreId(), shopOrderDTO.getDeviceId(), "生成WxPay订单","订单编号 : " + shopOrderDTO.getId()));
                return new ResponseEntity<>(respData, HttpStatus.OK);
            } else {
                shopLogService.anonymousCreate(shopLogService.getShopLog(shopOrderDTO.getStoreId(), shopOrderDTO.getDeviceId(), "WxPay下单失败","err_code_des : " + respData.get("err_code_des")));
                throw new Exception(respData.get("err_code_des"));
            }
        } else {
            shopLogService.anonymousCreate(shopLogService.getShopLog(shopOrderDTO.getStoreId(), shopOrderDTO.getDeviceId(), "WxPay下单失败","return_msg : " + respData.get("err_code_des")));
            throw new Exception(respData.get("return_msg"));
        }
    }