一：支付宝退款

示例代码：

AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do","app_id","your private_key","json","GBK","alipay_public_key","RSA2");
AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();
JSONObject bizContent = new JSONObject();
bizContent.put("trade_no", "2021081722001419121412730660");
bizContent.put("refund_amount", 0.01);
bizContent.put("out_request_no", "HZ01RF001");返回参数选项，按需传入
//JSONArray queryOptions = new JSONArray();
//queryOptions.add("refund_detail_item_list");
//bizContent.put("query_options", queryOptions);request.setBizContent(bizContent.toString());
AlipayTradeRefundResponse response = alipayClient.execute(request);
if(response.isSuccess()){
System.out.println("调用成功");
} else {
System.out.println("调用失败");
}

二：代码示例

@RequestMapping("/refund")
public AjaxResult refund(String orderid) {System.out.println( "退款订单号" + orderid );SysOrders sysOrders = sysOrdersService.selectOne( orderid );try {AlipayClient alipayClient = new DefaultAlipayClient(constant.serverUrl,constant.appId,constant.privateKey,constant.format,constant.charset,constant.PublicKey,"RSA2" );AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();JSONObject bizContent = new JSONObject();bizContent.put( "out_trade_no", sysOrders.getOrderId() );bizContent.put( "refund_amount", 1 );bizContent.put( "out_request_no", System.currentTimeMillis() + "" );request.setBizContent( bizContent.toString() );AlipayTradeRefundResponse response = alipayClient.execute( request );if (response.isSuccess()) {System.out.println( "调用成功" );return AjaxResult.success( "退款调用成功" );} else {System.out.println( "退款调用失败" );}} catch (AlipayApiException e) {e.printStackTrace();}return AjaxResult.error( "调用失败" );
}

三：测试

数据库新增订单信息

成功支付

控制台输出

数据库订单状态

调用退款接口

控制台输出

注意：如果是全额退款支付宝不会调用异步返回的接口，如果退款金额比订单金额小，支付宝会调用异步返回的的接口，可以获取退款状态，去修改订单的状态，修改金额等等