Alipay app payment

Alipay official documentation

Step 1: Return the order information to the front end and make it call Alipay.

public String  zfb_payrequest( ){
            String orderInfo = null;  
            Map <String, Object> map= new HashMap<> ();
             // . . . . . Omit insert order list operation
           　
　　　　　　　// Company account information 
            String APP_PRIVATE_KEY="xxxxxxxxx" ;
            String ALIPAY_PUBLIC_KEY="xxxxxxx";
            String APP_ID = "xxxxxxx" ;
             // Instantiate client 
            AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do",APP_ID, APP_PRIVATE_KEY, "json", "UTF-8", ALIPAY_PUBLIC_KEY , "RSA2" );
             // Instantiate the request class corresponding to the specific API, the class name corresponds to the interface name, the current calling interface name: alipay.trade.app.pay 
            AlipayTradeAppPayRequest request = new AlipayTradeAppPayRequest();
            
            // The SDK has encapsulated the public parameters, only the business parameters need to be passed in here. The following method is the model input method of sdk (take biz_content when model and biz_content exist at the same time). 
            AlipayTradeAppPayModel model = new AlipayTradeAppPayModel();
           //   model.setPassbackParams(user_id);;   // Add additional data to description information 
            model.setSubject("Recharge"); // Product title 
            model.setOutTradeNo(out_trade_no); // Merchant order number 
            model.setTimeoutExpress 
            ("30m"); // timeout to close the order time 
            model.setTotalAmount(money);   // total order amount , which is a fixed value of QUICK_MSECURITY_PAY
            request.setBizModel(model);
            request.setNotifyUrl( "http://xxx.xx.xx.xx/xx/xx/xx");   // callback address (accessible from external network)

　　　　　　　　try { 
　　　　　　　　　　// This is different from ordinary interface calls, using sdkExecute 
　　　　　　　　　　AlipayTradeAppPayResponse response = alipayClient.sdkExecute(request); System.out.println(response.getBody());
　　　　　　　　　　// That is, the orderString can be requested directly to the client, No further processing is required. 
　　　　　　　　　　orderInfo = response.getBody();
　　　　　　　　　　}catch (AlipayApiException e){
　　　　　　　　　　 e.printStackTrace ();
　　　　　　　　　　}
　　　　　　
　　map.put("orderString",orderInfo); 
　　map.put("result", 1); 
　　String jsonString = JSON.toJSONString(map);
　　return jsonString;
}

The second step is to receive Alipay asynchronous callback information

For transactions generated by App payment, Alipay will notify the merchant of the payment result as a parameter in the form of a POST request according to the asynchronous notification address notify_url passed in the original payment API.

public String  aliPay_notify(Map requestParams,HttpServletRequest request){                   
 　　　　　　　　　　　　System.out.println("被调用了。。。。。");
                    String APP_PRIVATE_KEY ="xxxxx" ;
                     // Remember that alipaypublickey is Alipay's public key 
                    String alipaypublickey="xxxxxxxxxxxxxx" ;
                    String APP_ID="2018041202543416";
                     requestParams=request.getParameterMap(); 
                     System.out.println( "Alipay payment result notification"+ requestParams.toString());
                     
                        // Get feedback from Alipay POST 
                        Map<String,String> params = new HashMap<String,String> ();
                         for (Iterator 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] + ",";
                          }
                          // The garbled code is solved, this code is used when there is garbled code.
                          // valueStr = new String(valueStr.getBytes("ISO-8859-1"), "utf-8"); 
                          params.put(name, valueStr);
                         }
                        System.out.println("--0101110110101--");
                        System.out.println(params.toString() +"++" );
                         // Remember that alipaypublickey is Alipay's public key, please go to open.alipay.com to view it under the corresponding application.
                        // boolean AlipaySignature.rsaCheckV1(Map<String, String> params, String publicKey, String charset, String sign_type) 
                        try {
                             // Verify the signature (to judge whether it is from Alipay) 
                            boolean flag = AlipaySignature.rsaCheckV1(params, alipaypublickey, "UTF-8", "RSA2" );
                            System.out.println( "Result: "+flag+"---------" );
                             if (flag){
                                 if ("TRADE_SUCCESS".equals(params.get("trade_status" ))){
                                     // Payment amount 
                                    String money = params.get("buyer_pay_amount" );
                                     // merchant order number 
                                    String out_trade_no = params.get("out_trade_no" );
                                     // Alipay transaction number 
                                    String trade_no = params.get("trade_no");
                                     // trade status 
                                    String trade_status = params.get("trade_status" );
                                     // additional data

　　　　　　　　　　　　　　　　　　　　 String passback_params = URLDecoder.decode(params.get("passback_params"))；

　　　　　　　　　　　　　　　　　　　　　　//Successful payment
                                     if (trade_status.equals("TRADE_SUCCESS" )) {
                                        System.out.println( "Operation after successful payment...star" );
                                   
                               　　 }
                            }
                        } catch (AlipayApiException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }return "success";
                }

At this point, the payment ends.