@ApiOperation(value = "预支付")
@PostMapping("/wxAppletPay")
public WxPayUnifiedOrderV3Result.JsapiResult  wxAppletPay(PayRequestDTO weChatPayRequest) throws Exception {
    WxPayConfig wxConfig = this.getWxConfig();
    System.out.println(wxConfig.getAppId()+"appid"+weChatPayRequest.getOpenId()+"openid");
    WxPayServiceImpl wxPayServiceApacheHttp = new WxPayServiceImpl();
    wxPayServiceApacheHttp.setConfig(this.getWxConfig());
    WxPayUnifiedOrderV3Request request = new WxPayUnifiedOrderV3Request();
    WxPayUnifiedOrderV3Request.Amount amount = new WxPayUnifiedOrderV3Request.Amount();
    amount.setCurrency("CNY").setTotal(weChatPayRequest.getTotalFee().multiply(new BigDecimal(100)).intValue());
    WxPayUnifiedOrderV3Request.Payer payer = new WxPayUnifiedOrderV3Request.Payer();
    payer.setOpenid(weChatPayRequest.getOpenId());
    WxPayUnifiedOrderV3Request.SceneInfo sceneInfo = new WxPayUnifiedOrderV3Request.SceneInfo();
    sceneInfo.setPayerClientIp("127.0.0.1");
    request.setAmount(amount).setPayer(payer).setOutTradeNo(weChatPayRequest.getOrderNo())
            .setSceneInfo(sceneInfo).setDescription(weChatPayRequest.getBody()).setNotifyUrl("http://ling.l2.ttut.cc/app/wxzf/notify/order");
    WxPayUnifiedOrderV3Result result = wxPayServiceApacheHttp.unifiedOrderV3(TradeTypeEnum.JSAPI, request);
    //WxPayConfig wxConfig =getWxConfig();
    String privateKeyPath = wxConfig.getPrivateKeyPath();
    PrivateKey privateKey =getPrivateKey(privateKeyPath);
    WxPayUnifiedOrderV3Result.JsapiResult payInfo = result.getPayInfo(TradeTypeEnum.JSAPI, wxConfig.getAppId(), wxConfig.getMchId(), privateKey);
    return  payInfo;
}
这是代码 appid是小程序的appid openid是小程序的openid