<dependency>
      <groupId>com.github.wxpay</groupId>
      <artifactId>wxpay-sdk</artifactId>
      <version>0.0.3</version>
  </dependency>

public class MyWxpayConfig  implements WXPayConfig {
    private byte [] certData;

    public MyWxpayConfig() throws  Exception{
        InputStream certStream = Thread.currentThread().getContextClassLoader().getResourceAsStream("cert/apiclient_cert.p12");
        this.certData = IOUtils.toByteArray(certStream);
        certStream.close();
    }

    public static final String APP_ID = 应用ID;

    public static final String APP_KEY = 支付key; 

 　　public static final String MCH_ID = 商户号; 
　　
　　 public static final String BODY = 用户界面展示内容; 

 　　public static final String PARTNER_ID = "*******"; 

 　　public static final String GRANT_TYPE = "client_credential"; 

 　　public static String GATEURL = "https://api.mch.weixin.qq.com/pay/unifiedorder"; 
　　
 　　public static String NOTIFY_URL = 回调接口地址; 

 　　public static String ORDER_QUERY = "https://api.mch.weixin.qq.com/pay/orderquery"; 

　　 @Override public String getAppID() { return APP_ID; }
 
　　 @Override public String getMchID() { return MCH_ID; }

　　 @Override public String getKey() { return APP_KEY; } 

　　 @Override public InputStream getCertStream() { return null; } 

　　 @Override public int getHttpConnectTimeoutMs() { return 8000; } 

　　 @Override public int getHttpReadTimeoutMs() { return 10000; } }

　　　@Service

　　　public class WxPayServiceImpl implements WxPayService {

  
　　@Override
    public Map<String, String> dounifiedOrder(订单信息,IP地址) throws Exception {
　　　　　//本地订单信息操作略过
        Map<String, String> fail = new HashMap<>();
        MyWxpayConfig config = new MyWxpayConfig();
        WXPay wxpay = new WXPay(config);
        Map<String, String> data = new HashMap<String, String>();
        data.put("appid", MyWxpayConfig.APP_ID);
        data.put("mch_id", MyWxpayConfig.MCH_ID);
        data.put("nonce_str", WXPayUtil.generateNonceStr());
        data.put("body", 用户界面信息);
        data.put("out_trade_no", UUID.randomUUID().toString().replaceAll("-", ""));
        data.put("total_fee", 订单金额);//String类型，以分为单位
        data.put("spbill_create_ip", IP地址);
        data.put("notify_url", MyWxpayConfig.NOTIFY_URL);
        data.put("trade_type", "APP");
        data.put("sign", WXPayUtil.generateSignature(data, MyWxpayConfig.APP_KEY));
        Map<String,String>dataMap=new HashMap<String,String>();
        Map<String,String> map = new HashMap<>();
        try {

            Map<String, String> resp = wxpay.unifiedOrder(data);
            if("SUCCESS".equals(resp.get("result_code"))){
                String nonce_str = (String)resp.get("nonce_str");
                String prepay_id = (String)resp.get("prepay_id");
                Long time =System.currentTimeMillis()/1000;
                map.put("appid",config.getAppID());
                map.put("partnerid",config.getMchID());
                map.put("package","Sign=WXPay");
                map.put("noncestr",nonce_str);
                map.put("timestamp",time+"");
                map.put("prepayid",prepay_id);
                map.put("sign",sign);
            }
            resp.put("time",System.currentTimeMillis()/1000+"");
            return map;
        } catch (Exception e) {
　　　　　　　fail.put("failMsg",e.toString());
　　　　　　　return fail;
　　　　 }
　　} 

private static final String TRANSFERS_PAY = "https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers"; 

    private static final String TRANSFERS_PAY_QUERY = "https://api.mch.weixin.qq.com/mmpaymkttransfers/gettransferinfo"; 

    private static final String APP_ID = MyWxpayConfig.APP_ID;

    private static final String MCH_ID = MyWxpayConfig.MCH_ID;
public Map<String,String> wxSendWallet (IP地址) {boolean tansferStatus=false;
            String responseInfo="";
            String xml = wxSendWallet(用户openId,金额,IP地址 );
            try {
                //指定读取证书格式为PKCS12
                KeyStore keyStore = KeyStore.getInstance("PKCS12");
                InputStream instream = Thread.currentThread().getContextClassLoader().getResourceAsStream("cert/apiclient_cert.p12");
                try {
                    keyStore.load(instream, MyWxpayConfig.MCH_ID.toCharArray());
                } finally {
                    instream.close();
                }
                SSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(keyStore, MyWxpayConfig.MCH_ID.toCharArray()).build();
                SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
                sslcontext, new String[]{"TLSv1"}, null, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
                CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();
                HttpPost httppost = new HttpPost("https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers");
                httppost.addHeader("Content-Type", "text/xml");
                StringEntity se = new StringEntity(xml, "UTF-8");
                httppost.setEntity(se);
                CloseableHttpResponse responseEntry = httpclient.execute(httppost);
                try {
                    HttpEntity entity = responseEntry.getEntity();
                    if (entity != null) {
                        SAXReader saxReader = new SAXReader();
                        Document document = saxReader.read(entity.getContent());
                        Element rootElt = document.getRootElement();
                        String resultCode = rootElt.elementText("result_code");
                        if (resultCode.equals("SUCCESS")) {
                            tansferStatus=true;
　　　　　　　　　　　　　　　　　//成功后操作

                        } else {
                            //失败后操作
                            responseInfo=rootElt.elementText("err_code_des");
                        }
                    }
                    EntityUtils.consume(entity);
                } catch (Exception e) {
                    
                } finally {
                    responseEntry.close();
                }
            } catch (Exception e) {
                
            }
            if(tansferStatus==true){
                
            }
        HashMap<String, Object> responseBody = new HashMap<>();
        responseBody.put("status",tansferStatus);
        responseBody.put("responseInfo",responseInfo);
        return responseBody;
        }


    public static String wxSendWallet( 用户openId,金额,IP地址) {
        String data = null;
        try {
            String nonceStr = WXPayUtil.generateNonceStr();
            SortedMap<String,String> parameters = new TreeMap<String,String>();
            parameters.put("mch_appid",APP_ID );
            parameters.put("mchid", MCH_ID);
            parameters.put("nonce_str", nonceStr);
            String outTradeNo = UUID.randomUUID().toString().replaceAll("-", "");
            parameters.put("partner_trade_no", outTradeNo);
            parameters.put("openid", 用户openId);
            parameters.put("check_name", "NO_CHECK");
            parameters.put("amount", 金额);
            parameters.put("spbill_create_ip",  IP地址);
            parameters.put("desc", 商家名称);
            //签名
            parameters.put("sign", WXPayUtil.generateSignature(parameters, MyWxpayConfig.APP_KEY));
            data = WXPayUtil.mapToXml(parameters);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return data;
    }
    //元转分
    public String changeY2F(double price) {
        int amount= (int) (price * 100);
        return String.valueOf(amount);
    }

}

that.$myRequest({
      url: ‘/Pay/wxOrder‘,
      methods: ‘post‘,
      data: { 订单信息 },
      })
　　　　.then(res => {
          uni.requestPayment({
          　　provider: ‘wxpay‘,
             orderInfo: 后台返回的微信支付参数,
             success: (e) => {
　　　　　　　　　　成功后的操作
　　　　　　　　},
             fail: (e) => {
　　　　　　　　　　失败后的操作
         　　 },
             complete: () => { 
　　　　　　　　　　完成后的操作
　　　　　　　　}
　　 　　　 })
　　　　}).catch(err => {
       });