/*** 支付宝的退款接口* @param orderId 商户的订单号* @param tradeNo 支付宝的交易流水号* @param totalAmount 退款金额* @return*/public static Map alipayCreateOrderRefund(String orderId,String tradeNo,String totalAmount) {Map map = new LinkedHashMap();AlipayClient alipayClient = new DefaultAlipayClient(AlipayConfig. aliPayUrl,AlipayConfig.appId, AlipayConfig.developerSpoon,"json", AlipayConfig.input_charset, AlipayConfig.aliPaySpoon, "RSA2");AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();AlipayTradeRefundModel model= new AlipayTradeRefundModel();model.setOutTradeNo(orderId);//订单支付时传入的商户订单号model.setTradeNo(tradeNo);//支付宝交易号model.setRefundAmount(totalAmount);//refund_amount    需要退款的金额，该金额不能大于订单金额,单位为元
request.setBizModel(model);//请求参数
AlipayTradeRefundResponse  response=null;try {response = alipayClient.execute(request);System.out.println(JSONObject.fromObject(response).toString());Map tuiMap=JSONObject.fromObject(response);}catch ( AlipayApiException e){String massage = "alipay.trade.refund退款接口：订单签名错误";System.out.println(massage);}if(response.isSuccess()){System.out.println("调用成功");map.put("status", 0);//订单退款  status：0 成功 1:失败logger.info("支付宝：支付订单支付结果查询：订单out_trade_no----"+orderId+"---订单退款成功！");} else {System.out.println("调用失败");map.put("status",1);//订单退款  status：0 成功 1:失败logger.info("支付宝：支付订单支付结果查询：订单out_trade_no----"+orderId+"---订单退款失败！");}return map;}

退款成功：
{"body":"{"alipay_trade_refund_response":{"code":"10000","msg":"Success","buyer_logon_id":"185******13","buyer_user_id":"2088422483503995","fund_change":"N","gmt_refund_pay":"2019-08-13 17:48:25","out_trade_no":"12337925","refund_fee":"0.01","send_back_fee":"0.00","trade_no":"2019081322001403990517324158"},"sign":"dNhUcD9THBOpAigyklYLyaNqUOEv2IpxENZLshgG4dzQkKa04GvVU1a9dqib98osDOEYAnGf1RNzm1QZvvw/9ybVCWMkQK0C/No+Tv13+7DZ2DfSqmtG+JsEugQM4lHJfsVm/QUIU9kprPOeuKJAoAw+fLVXaSgFT+hsnatHUpR0F+3ail/jpQDfonneMfJanMuAxbfA2LVlxHVpIaoC73yyHK0WEQNrSwnp0pTEO30uqnLi4EehiV+Wo8bSdGr9ilzAEmq1bcDsNQuftE+4TU/I4J5KyhjAJos4SbOU+98fQylwSqdG16Od3lDEuusedPq5bz1yoW+mDW0peU5i+g=="}","buyerLogonId":"185******13","buyerUserId":"2088422483503995","code":"10000","errorCode":"10000","fundChange":"N","gmtRefundPay":{"date":13,"day":2,"hours":17,"minutes":48,"month":7,"seconds":25,"time":1565689705000,"timezoneOffset":-480,"year":119},"msg":"Success","openId":"","outTradeNo":"12337925","params":{"biz_content":"{"out_trade_no":"12337925","refund_amount":"0.01","trade_no":"2019081322001403990517324158"}"},"presentRefundBuyerAmount":"","presentRefundDiscountAmount":"","presentRefundMdiscountAmount":"","refundCurrency":"","refundDetailItemList":[],"refundFee":"0.01","sendBackFee":"0.00","storeName":"","subCode":"","subMsg":"","success":true,"tradeNo":"2019081322001403990517324158"
}