第三方对接-支付宝支付

应用场景：

商户出售商品，用户购买支付，商户接入第三方支付平台支付宝

对接要求：

1、先创建网页&移动应用点击打开链接，提交并且通过审核后才能进行对接

2、开发者调用接口前需要先生成RSA2密钥，RSA密钥包含应用私钥(APP_PRIVATE_KEY)、应用公钥(APP_PUBLIC_KEY）。生成密钥后在开放平台管理中心进行密钥配置，配置完成后可以获取支付宝公钥(ALIPAY_PUBLIC_KEY)

3、搭建和配置开发环境

下载服务端SDK：

<!-- https://mvnrepository.com/artifact/com.alipay.sdk/alipay-sdk-java -->
<dependency><groupId>com.alipay.sdk</groupId><artifactId>alipay-sdk-java</artifactId><version>3.0.0</version>
</dependency>

对接流程：

1、封装参数，申请接入支付宝支付，会有APPID，公钥私钥等参数。

2、支付流程

发起一个支付请求（携带订单号，价格等参数）到支付宝统一下单接口，生成预支付路径，响应给客户端浏览器。
用户进行扫码或者在页面登录支付宝支付。
服务端异步接收支付结果。

①：发起支付请求

@RequestMapping("gotoPay")
public void gotoPay(HttpServletRequest httpRequest,HttpServletResponse httpResponse) throws ServletException, IOException {AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do", APP_ID, APP_PRIVATE_KEY, FORMAT, CHARSET, ALIPAY_PUBLIC_KEY, SIGN_TYPE); //获得初始化的AlipayClientAlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();//创建API对应的requestalipayRequest.setReturnUrl("http://domain.com/CallBack/returnURL.html");//回跳地址alipayRequest.setNotifyUrl("http://domain.com/CallBack/notifyURL.html");//通知地址alipayRequest.setBizContent("{" +" \"out_trade_no\":\"20150320010101001\"," +                                        //订单号（支付宝要求商户订单号必须唯一）" \"product_code\":\"FAST_INSTANT_TRADE_PAY\"," +                                   //销售产品码，与支付宝签约的产品码名称，目前仅支持FAST_INSTANT_TRADE_PAY。" \"total_amount\":88.88," +                                                        //价格" \"subject\":\"Iphone6 16G\"," +                                                   //订单标题" \"body\":\"Iphone6 16G\"," +                                                      //订单描述" \"passback_params\":\"merchantBizType%3d3C%26merchantBizNo%3d2016010101111\"," +  //公用回传参数，如果请求时传递了该参数，则返回给商户时会回传该参数。支付宝只会在异步通知时将该参数原样返回。本参数必须进行UrlEncode之后才可以发送给支付宝" \"extend_params\":{" +                                                            //业务扩展参数" \"sys_service_provider_id\":\"2088511833207846\"" +                                //系统商编号，该参数作为系统商返佣数据提取的依据，请填写系统商签约协议的PID" }"+" }");//填充业务参数String form="";try {form = alipayClient.pageExecute(alipayRequest).getBody(); //调用SDK生成表单} catch (AlipayApiException e) {e.printStackTrace();}httpResponse.setContentType("text/html;charset=" + CHARSET);httpResponse.getWriter().write(form);//直接将完整的表单html输出到页面httpResponse.getWriter().flush();httpResponse.getWriter().close();
}

②、用户确认支付后，支付宝get请求returnUrl(将网页重定向到何处)

@RequestMapping(value = "returnURL", method = RequestMethod.GET)
public String returnURL(Device device) {System.out.println("支付宝处理完毕后返回商户网站");if (device.isNormal()) {return "shop/alipay/payResult";} else {return "mobile/alipay/payResult";}
}

③、交易成功后，支付宝post请求notifyUrl

@RequestMapping(value = "notifyURL", method = RequestMethod.POST)
public void notifyURL(HttpServletRequest httpRequest){//将异步通知中收到的所有参数都存放到map中 ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓Map<String, String> paramsMap = MapUtil.map();Map<String, String[]> requestParams = request.getParameterMap();for (Object element : requestParams.keySet()) {String name = (String) element;String[] values = requestParams.get(name);StringBuilder valueStr = new StringBuilder();for (int i = 0; i < values.length; i++) {valueStr.append((i == values.length - 1) ? values[i] : values[i] + ",");}params.put(name, valueStr.toString());}//将异步通知中收到的所有参数都存放到map中 ↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑boolean signVerified = AlipaySignature.rsaCheckV1(paramsMap, ALIPAY_PUBLIC_KEY, CHARSET, SIGN_TYPE) //调用SDK验证签名if(signVerfied){// TODO 验签成功后，按照支付结果异步通知中的描述，对支付结果中的业务内容进行二次校验，校验成功后在response中返回success并继续商户自身业务处理，校验失败返回failure}else{// TODO 验签失败则记录异常日志，并在response中返回failure.}
}

④、若由于网络等问题异步通知没有到达，商户可自行调用alipay.trade.query接口进行查询，根据查询接口获取交易以及支付信息（商户也可以直接调用查询接口，不需要依赖异步通知）。

public void query(){AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do","app_id","your private_key","json","GBK","alipay_public_key","RSA2");AlipayTradeQueryRequest request = new AlipayTradeQueryRequest();request.setBizContent("{" +"\"out_trade_no\":\"20150320010101001\"," +                        //订单支付时传入的商户订单号,和支付宝交易号不能同时为空。 "\"trade_no\":\"2014112611001004680 073956707\"" +                 //支付宝交易号，和商户订单号不能同时为空"  }");AlipayTradeQueryResponse response = alipayClient.execute(request);if(response.isSuccess()){//获取支付信息System.out.println("调用成功");} else {System.out.println("调用失败");}
}

⑤、交易发生后一段时间内，如果用户想退款，买家可以通过退款接口将支付款退给买家。

public void refund() throws AlipayApiException {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();request.setBizContent("{" +"\"out_trade_no\":\"20150320010101001\"," + "\"trade_no\":\"2014112611001004680073956707\"," +"\"refund_amount\":200.12," +"\"refund_currency\":\"USD\"," +"\"refund_reason\":\"正常退款\"," +"\"out_request_no\":\"HZ01RF001\"," +"\"operator_id\":\"OP001\"," +"\"store_id\":\"NJ_S_001\"," +"\"terminal_id\":\"NJ_T_001\"," +"      \"goods_detail\":[{" +"        \"goods_id\":\"apple-01\"," +"\"alipay_goods_id\":\"20010001\"," +"\"goods_name\":\"ipad\"," +"\"quantity\":1," +"\"price\":2000," +"\"goods_category\":\"34543238\"," +"\"body\":\"特价手机\"," +"\"show_url\":\"http://www.alipay.com/xxx.jpg\"" +"        }]" +"  }");AlipayTradeRefundResponse response = alipayClient.execute(request);if(response.isSuccess()){System.out.println("调用成功");} else {System.out.println("调用失败");}
}

⑥、统一收单交易退款查询

public void queryRefund(){AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do","app_id","your private_key","json","GBK","alipay_public_key","RSA2");AlipayTradeFastpayRefundQueryRequest request = new AlipayTradeFastpayRefundQueryRequest();request.setBizContent("{" +"\"trade_no\":\"20150320010101001\"," +"\"out_trade_no\":\"2014112611001004680073956707\"," +"\"out_request_no\":\"2014112611001004680073956707\"" +"  }");AlipayTradeFastpayRefundQueryResponse response = alipayClient.execute(request);if(response.isSuccess()){System.out.println("调用成功");} else {System.out.println("调用失败");}
}

⑦、统一收单交易关闭接口(用于交易创建后，用户在一定时间内未进行支付，可调用该接口直接将未付款的交易进行关闭。)

public void tradeClose(){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();request.setBizContent("{" +"\"out_trade_no\":\"20150320010101001\"," +"\"trade_no\":\"2014112611001004680073956707\"," +"\"refund_amount\":200.12," +"\"refund_currency\":\"USD\"," +"\"refund_reason\":\"正常退款\"," +"\"out_request_no\":\"HZ01RF001\"," +"\"operator_id\":\"OP001\"," +"\"store_id\":\"NJ_S_001\"," +"\"terminal_id\":\"NJ_T_001\"," +"      \"goods_detail\":[{" +"        \"goods_id\":\"apple-01\"," +"\"alipay_goods_id\":\"20010001\"," +"\"goods_name\":\"ipad\"," +"\"quantity\":1," +"\"price\":2000," +"\"goods_category\":\"34543238\"," +"\"body\":\"特价手机\"," +"\"show_url\":\"http://www.alipay.com/xxx.jpg\"" +"        }]" +"  }");AlipayTradeRefundResponse response = alipayClient.execute(request);if(response.isSuccess()){System.out.println("调用成功");} else {System.out.println("调用失败");}
}

真心话，支付宝对接的API比微信写的强太多了支付宝官方API

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