一、适用场景：pc端拉起付款二维码 用户扫码付款（非证书模式下单）

二、接入准备

1：支付宝-appId

2：支付宝公钥-appPublicKey

（是支付宝公钥，不是应用公钥，拿错会无法拉起支付）

3：支付宝应用私钥-appPrivateKey

三、官方DEMO下载地址

支付宝sdk官方下载地址

/open/270/106291?ref=api

四、代码

1：maven依赖

<!-- 支付宝支付SDK --><dependency><groupId>com.alipay.sdk</groupId><artifactId>alipay-sdk-java</artifactId><version>4.9.100.ALL</version></dependency>

2：配置文件

介绍下其他参数

returnUrl：阿里同步通知接口地址—后边会有代码展示

notifyUrl：支付后阿里通知支付状态的接口地址—后边会有代码展示

requestUrl：主要用于支付成功后页面跳转的网站地址（支付宝支付前端会用阿里自己的页面，所以支付成功以后要跳转到自己的页面）

配置类

@ConfigurationProperties(prefix = "alipay")@Component@Datapublic class AliPayProperties {private String appId;private String gatewayUrl;private String format;private String charset;private String signType;private String returnUrl;private String notifyUrl;private String appPrivateKey;private String appPublicKey;private String requestUrl;//支付宝支付页面超时时间private String overTime;}

3：下单接口

//支付宝拉起统一下单public Map<String, String> prePay(UserOrders order, String clientIP) {log.info("支付宝统一下单接收到请求,下单用户ip ：{}", clientIP);Map<String, String> map = new HashMap<>();AlipayClient alipayClient=new DefaultAlipayClient(properties.getGatewayUrl(),properties.getAppId(),properties.getAppPrivateKey(),properties.getFormat(),properties.getCharset(),properties.getAppPublicKey(),properties.getSignType());try {//商户订单号，商户网站订单系统中唯一订单号，必填String out_trade_no = new String(order.getOrderNum().getBytes("UTF-8"),"UTF-8");//付款金额，必填Double payPrice = order.getPayPrice();String total_amount = new String(payPrice.toString().getBytes("UTF-8"),"UTF-8");//订单名称，必填String subject = new String(order.getPackageName().getBytes("UTF-8"),"UTF-8");AlipayTradePagePayRequest request = new AlipayTradePagePayRequest();String encode = URLEncoder.encode(order.getOperatorInfo(), "UTF-8");request.setNotifyUrl(properties.getNotifyUrl());request.setReturnUrl(properties.getReturnUrl());request.setBizContent("{\"out_trade_no\":\""+ out_trade_no +"\","+ "\"total_amount\":\""+ total_amount +"\","+ "\"subject\":\""+ subject +"\","+ "\"passback_params\":\""+ encode +"\","+ "\"timeout_express\":\""+ properties.getOverTime()+"\","+ "\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}");AlipayTradePagePayResponse response = null;response = alipayClient.pageExecute(request);map.put("success", "true");map.put("body", response.getBody());map.put("msg", response.getMsg());} catch (AlipayApiException e) {e.printStackTrace();}catch (UnsupportedEncodingException e) {e.printStackTrace();}return map;}

对当前返回的map进行校验返回前端

4：异步回调

controller

@RequestMapping("/ali/notify")public String notify(HttpServletRequest request){log.info("支付宝异步回调接收到请求!!!");Map<String,String> flag = aliPayService.aliPayNotify(request);if("success".equals(flag.get("status"))){//这块做自己的业务逻辑AsyncManager.me().execute(AsyncFactory.updateCourseSignNum(flag.get("courseId")));}return flag.get("status");}

service

public Map<String, String> aliPayNotify(HttpServletRequest request) {Map<String, String> map = new HashMap<>();try {Map<String, String> params = new HashMap<String, String>();Map<String, String[]> requestParams = request.getParameterMap();for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext(); ) {String name = (String) iter.next();String[] values = (String[]) requestParams.get(name);String valueStr = "";for (int i = 0; i < values.length; i++) {valueStr = (i == values.length - 1) ? valueStr + values[i]: valueStr + values[i] + ",";}//乱码解决，这段代码在出现乱码时使用valueStr = new String(valueStr.getBytes("UTF-8"), "UTF-8");params.put(name, valueStr);}log.info("alipay支付回调：" + JSON.toJSONString(params));boolean flag = AlipaySignature.rsaCertCheckV1(params, properties.getPublicKeyFilePath(), properties.getCharset(), properties.getSignType());if (flag) {log.info("支付宝回调签名通过");//商户订单号String out_trade_no = new String(request.getParameter("out_trade_no").getBytes("UTF-8"), "UTF-8");//支付宝交易号String trade_no = new String(request.getParameter("trade_no").getBytes("UTF-8"), "UTF-8");//交易状态String trade_status = new String(request.getParameter("trade_status").getBytes("UTF-8"), "UTF-8");//订单的金额String total_amount = new String(request.getParameter("total_amount").getBytes("UTF-8"), "UTF-8");//商户idString sellerId = new String(request.getParameter("seller_id").getBytes("UTF-8"), "UTF-8");log.info("此次订单金额为==>> {}", total_amount);if ("TRADE_FINISHED".equals(trade_status)) {//判断该笔订单是否在商户网站中已经做过处理//如果没有做过处理，根据订单号（out_trade_no）在商户网站的订单系统中查到该笔订单的详细，并执行商户的业务程序//如果有做过处理，不执行商户的业务程序log.info("交易finish非success");//注意：//退款日期超过可退款期限后（如三个月可退款），支付宝系统发送该交易状态通知} else if ("TRADE_SUCCESS".equals(trade_status)) {//判断该笔订单是否在商户网站中已经做过处理//如果没有做过处理，根据订单号（out_trade_no）在商户网站的订单系统中查到该笔订单的详细，并执行商户的业务程序//如果有做过处理，不执行商户的业务程序//注意：//付款完成后，支付宝系统发送该交易状态通知log.info("交易成功,更新订单状态");OrderInfo orderInfo = orderInfoMapper.selectOrderInfoByOrderNum(out_trade_no);BigDecimal aliPrice = new BigDecimal(total_amount);if (pareTo(orderInfo.getPayPrice()) != 0) {log.info("支付宝返回成交额与当前订单金额不符，返回fail");map.put("status", "fail");return map;}if ("1".equals(orderInfo.getPayStatus())) {//首次回调成功更新订单状态，给学员开课orderInfoService.updateOrderPayStatus(out_trade_no);}map.put("status", "success");map.put("courseId", String.valueOf(orderInfo.getCourseId()));return map;}} else {log.info("异步签名校验有误，返回fail");map.put("status", "fail");return map;}} catch (Exception e) {e.printStackTrace();map.put("status", "fail");return map;}map.put("status", "fail");return map;}

5：同步回调

controller

@RequestMapping("/ali/return")public void aliReturn(HttpServletRequest request, HttpServletResponse response){aliPayService.aliReturn(request,response);}

service

public void aliReturn(HttpServletRequest request, HttpServletResponse response) {try {log.info("支付宝同步回调接收到请求");Map<String, String> params = new HashMap<String, String>();Map<String, String[]> requestParams = request.getParameterMap();for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext(); ) {String name = (String) iter.next();String[] values = (String[]) requestParams.get(name);String valueStr = "";for (int i = 0; i < values.length; i++) {valueStr = (i == values.length - 1) ? valueStr + values[i]: valueStr + values[i] + ",";}//乱码解决，这段代码在出现乱码时使用valueStr = new String(valueStr.getBytes("ISO-8859-1"), "utf-8");params.put(name, valueStr);}//调用SDK验证签名boolean flag = AlipaySignature.rsaCertCheckV1(params, properties.getPublicKeyFilePath(), properties.getCharset(), properties.getSignType());if (flag) {//商户订单号String out_trade_no = new String(request.getParameter("out_trade_no").getBytes("ISO-8859-1"), "UTF-8");//支付宝交易号String trade_no = new String(request.getParameter("trade_no").getBytes("ISO-8859-1"), "UTF-8");//付款金额String total_amount = new String(request.getParameter("total_amount").getBytes("ISO-8859-1"), "UTF-8");log.info("支付宝同步回调参数 out_trade_no： {} ，trade_no： {}， total_amount ： {}", out_trade_no, trade_no, total_amount);response.sendRedirect(properties.getRequestUrl());} else {System.out.println("验签失败");response.sendRedirect(properties.getRequestUrl());}} catch (Exception e) {e.printStackTrace();try {response.sendRedirect(properties.getRequestUrl());} catch (IOException ex) {ex.printStackTrace();}}}