java支付宝退款接口_java 支付宝支付 交易退款接口alipay.trade.refund：

alipay.trade.refund(统一收单交易退款接口)

当交易发生之后一段时间内，由于买家或者卖家的原因需要退款时，卖家可以通过退款接口将支付款退还给买家，支付宝将在收到退款请求并且验证成功之后，按照退款规则将支付款按原路退到买家帐号上。 交易超过约定时间(签约时设置的可退款时间)的订单无法进行退款 支付宝退款支持单笔交易分多次退款，多次退款需要提交原支付订单的商户订单号和设置不同的退款单号。一笔退款失败后重新提交，要采用原来的退款单号。总退款金额不能超过用户实际支付金额

项目中具体代码实现：

/**

* @param alipayRefundRequestDTO :

* @return java.lang.String

* @Description 支付宝退款接口

* @Author huangkeyuan

* @Date 20:21 2019-12-12

*/

@PostMapping("refund")

@Override

public String alipayRefund(@RequestBody AlipayRefundRequestDTO alipayRefundRequestDTO) {

//实例化具体API对应的request类,类名称和接口名称对应,当前调用接口名称：

AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();

//SDK已经封装掉了公共参数，这里只需要传入业务参数。以下方法为sdk的model入参方式(model和biz_content同时存在的情况下取biz_content)。

AlipayTradeRefundModel model = new AlipayTradeRefundModel();

model.setOutTradeNo(alipayRefundRequestDTO.getOuttradeno());

model.setOutRequestNo(alipayRefundRequestDTO.getOutrefundno());

model.setRefundAmount(alipayRefundRequestDTO.getRefundfee());

request.setBizModel(model);

/**实例化客户端*/

CertAlipayRequest certAlipayRequest = new CertAlipayRequest();

certAlipayRequest.setServerUrl(aliPayConfig.getSERVERURL());

certAlipayRequest.setAppId(aliPayConfig.getAPPID());

certAlipayRequest.setPrivateKey(aliPayConfig.getAPP_PRIVATE_KEY());

certAlipayRequest.setFormat(aliPayConfig.getFORMAT());

certAlipayRequest.setCharset(aliPayConfig.getCHARSET());

certAlipayRequest.setSignType(aliPayConfig.getSIGN_TYPE());

certAlipayRequest.setCertPath(aliPayConfig.getAPP_CERT_PATH());

certAlipayRequest.setAlipayPublicCertPath(aliPayConfig.getALIPAY_CERT_PATH());

certAlipayRequest.setRootCertPath(aliPayConfig.getALIPAY_ROOT_CERT_PATH());

try {

//构造client

AlipayClient alipayClient = new LMAlipayClient(certAlipayRequest);

AlipayTradeRefundResponse response = alipayClient.execute(request);

log.info("支付宝退款返回信息,{}",response.getBody());

return response.getBody();

} catch (AlipayApiException e) {

log.error(e.getMessage(), e);

return null;

}

}

注意点

1.参数

1.outTradeNo 支付的时候传入的商家的支付订单编号

2.outRequestNo 本次退款的退款单号，标识一次退款请求，同一笔交易多次退款需要保证唯一，如需部分退款，则此参数必传。

3.refundAmount 退款金额

2.签名错误

在签名调用支付下单接口时，签名顺利通过了，本以为这里退款接口的签名应该也没问题；但是确实出现签名错误的问题；

后面找到原因是下单和退款的接口调用的api不同所以后面走的签名方法也不同。问题出现在：退款接口的签名在读取appCertSN为空。 做了修改之后签名就对了；

附上修改的方法：

private T _execute(AlipayRequest request, AlipayParser parser, String authToken, String appAuthToken) throws AlipayApiException {

long beginTime = System.currentTimeMillis();

Map rt = this.doPost(request, authToken, appAuthToken, this.appCertSN);

if (rt == null) {

return null;

} else {

Map costTimeMap = new HashMap();

if (rt.containsKey("prepareTime")) {

costTimeMap.put("prepareCostTime", (Long)((Long)rt.get("prepareTime")) - beginTime);

if (rt.containsKey("requestTime")) {

costTimeMap.put("requestCostTime", (Long)((Long)rt.get("requestTime")) - (Long)((Long)rt.get("prepareTime")));

}

}

AlipayResponse tRsp = null;

try {

ResponseEncryptItem responseItem = this.decryptResponse(request, rt, parser);

tRsp = parser.parse(responseItem.getRealContent());

tRsp.setBody(responseItem.getRealContent());

this.checkResponseSign(request, parser, responseItem.getRespContent(), tRsp.isSuccess());

if (costTimeMap.containsKey("requestCostTime")) {

costTimeMap.put("postCostTime", System.currentTimeMillis() - (Long)((Long)rt.get("requestTime")));

}

} catch (RuntimeException var11) {

AlipayLogger.logBizError((String)rt.get("rsp"), costTimeMap);

throw var11;

} catch (AlipayApiException var12) {

AlipayLogger.logBizError((String)rt.get("rsp"), costTimeMap);

throw new AlipayApiException(var12);

}

tRsp.setParams((AlipayHashMap)rt.get("textParams"));

if (!tRsp.isSuccess()) {

AlipayLogger.logErrorScene(rt, tRsp, "", costTimeMap);

} else {

AlipayLogger.logBizSummary(rt, tRsp, costTimeMap);

}

return (T)tRsp;

}

}