微信扫码支付及回调

## pom包

```xml <dependency> <groupId>com.github.binarywang</groupId> <artifactId>weixin-java-pay</artifactId> <version>4.0.0</version> </dependency> ```

## 配置

## 配置文件

获取配置

```java package com.zt.edu.userapi.weChat.config;

import lombok.Data; import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.stereotype.Component;

/** * @author <a href="https://github.com/binarywang">Binary Wang</a> */ @ConfigurationProperties(prefix = "wx.pay") @Data public class WxMaProperty {

/** * 公众账号ID */ private String appid;

/** * 支付通知地址 */ private String notifyUrl;

/** * 退款通知地址 */ private String refundUrl;

/** * 支付key */ private String key;

/** * 支付key */ private String keyPath;

}

```

配置文件

~~~java package com.zt.edu.userapi.weChat.config;

import com.github.binarywang.wxpay.config.WxPayConfig; import com.github.binarywang.wxpay.service.WxPayService; import com.github.binarywang.wxpay.service.impl.WxPayServiceImpl; import org.apache.commons.lang3.StringUtils; import org.springframework.boot.autoconfigure.condition.ConditionalOnClass; import org.springframework.boot.context.properties.EnableConfigurationProperties; import org.springframework.context.annotation.Configuration;

import javax.annotation.PostConstruct; import javax.annotation.Resource; import java.util.HashMap; import java.util.Map;

/** * @author hwk * @Description 支付配置 * @date 2021/3/22 14:09 **/ @Configuration @ConditionalOnClass(WxPayService.class) @EnableConfigurationProperties(WxMaProperty.class) public class WxPayConfiguration {

@Resource WxMaProperty wxMaProperty;

private static Map<String, WxPayService> wxPayServices = new HashMap<>();

@PostConstruct public void init() { //1、赋值wxPayServices WxPayConfig payConfig = new WxPayConfig(); payConfig.setAppId(StringUtils.trimToNull(wxMaProperty.getAppid())); payConfig.setMchId(StringUtils.trimToNull(wxMaProperty.getMchId())); payConfig.setMchKey(StringUtils.trimToNull(wxMaProperty.getKey())); payConfig.setKeyPath(StringUtils.trimToNull(wxMaProperty.getKeyPath())); // 可以指定是否使用沙箱环境 payConfig.setUseSandboxEnv(false);

WxPayService wxPayService = new WxPayServiceImpl(); wxPayService.setConfig(payConfig); wxPayServices.put(wxMaProperty.getAppid(),wxPayService); }

} ~~~

## 示例

~~~java package com.zt.edu.userapi.weChat.service.impl;

import com.github.binarywang.wxpay.bean.request.WxPayUnifiedOrderRequest; import com.github.binarywang.wxpay.bean.result.WxPayUnifiedOrderResult; import com.zt.edu.userapi.dto.ZtbOrderDTO; import com.zt.edu.userapi.service.ZtbPayResultService; import com.zt.edu.userapi.weChat.config.WxMaProperty; import com.zt.edu.userapi.weChat.config.WxPayConfiguration; import com.zt.edu.userapi.weChat.service.WeChatPayService; import com.zt.edu.userapi.weChat.util.WXPayUtil; import lombok.extern.slf4j.Slf4j; import org.springframework.stereotype.Service;

import javax.annotation.Resource; import java.math.BigDecimal;

@Service @Slf4j public class WeChatPayServiceImpl implements WeChatPayService {

@Resource private WxMaProperty wxMaProperty;

@Resource private WxPayConfiguration wxPayConfiguration;

@Resource private ZtbPayResultService ztbPayResultService;

@Resource
private WxMaProperty wxMaProperty;

统一下单后生成二维码

package com.zt.edu.userapi.util;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

/**
 * 生成二维码
 */
public class QRCodeUtil {

    /**
     * 
     * @param response
     * @param codeUrl 需要转二维码的URL
     */
    public static void createQrCode(HttpServletResponse response,String codeUrl) {
        try {
            //生成二维码配置
            Map<EncodeHintType,Object> hints = new HashMap<>();
            //设置纠错等级
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
            //设置编码类型
            hints.put(EncodeHintType.CHARACTER_SET,"UTF-8");
            //构造图片对象
            BitMatrix bitMatrix = new MultiFormatWriter().encode(codeUrl, BarcodeFormat.QR_CODE,400,400,hints);
            //输出流
            OutputStream out = response.getOutputStream();
            MatrixToImageWriter.writeToStream(bitMatrix,"png",out);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

代码示例