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PayHelper

支付开源框架（暂时只支持微信支付）

由于微信支付申请退款接口需要双向证书，另外退款可以直接在微信后台操作，相比通过应用系统自己的后台，微信的后台操作更简单直接，因此不在此项目中添加关于有关退款、查询退款以及下载对账单等接口；目前项目只支持统一下单、查询订单、关闭订单、微信支付通知。

引入Maven依赖

  <dependency>
     <groupId>vip.yoxiang</groupId>
     <artifactId>PayHelper</artifactId>
     <version>1.0</version>
  </dependency>

使用简介

项目资源目录中添加wx_merchant.ini配置文件，配置商户APPID、商户ID、商户API秘钥，格式如下

====================================================================

商户应用ID

appId=XXXXXX

商户ID

mchId=XXXXXX

商户API密钥

mchKey=XXXXX

=====================================================================

通过Merchant.getInstance()获取商户对象，该方法默认自动加载资源目录下的wx_merchant.ini配置文件； 当然你也可以通过Merchant.getInstance("资源路径")方法加载指定路径中的配置文件，可以通过classpath、url等方式加载配置文件

统一下单

String notifyUrl = "回调地址";
Merchant merchant = Merchant.getInstance();
WechatPayHeader payHeader = new WechatPayHeader(merchant.getAppId(), merchant.getMchId(), merchant.getMchKey());
WechatUnifiedOrderRequest unifiedOrderRequest = new WechatUnifiedOrderRequest(payHeader, notifyUrl);
unifiedOrderRequest.setBody("测试数据");
unifiedOrderRequest.setAttach("测试附加内容");
unifiedOrderRequest.setOutTradeNo("201802131509358989");
unifiedOrderRequest.setSpbillCreateIp("127.0.0.1");
unifiedOrderRequest.setTotalFee("1");
unifiedOrderRequest.setTradeType("APP");
WechatPayRequestHandler requestHandler = new WechatPayRequestHandler(unifiedOrderRequest);
WechatPayResponse wechatPay = requestHandler.process();
WechatUnifiedOrderResponse unifiedOrderResponse = (WechatUnifiedOrderResponse) wechatPay;

查询订单

Merchant merchant = Merchant.getInstance();
WechatQueryOrderRequest queryOrderRequest = new WechatQueryOrderRequest(merchant.getAppId(), merchant.getMchId(),     merchant.getMchKey());
queryOrderRequest.setOutTradeNo("201802131509358989");
WechatPayRequestHandler requestHandler = new WechatPayRequestHandler(queryOrderRequest);
WechatQueryOrderResponse queryOrderResponse = (WechatQueryOrderResponse) requestHandler.process();

关闭订单

Merchant merchant = Merchant.getInstance();
WechatCloseOrderRequest closeOrderRequest = new WechatCloseOrderRequest(merchant.getAppId(), merchant.getMchId(), merchant.getMchKey());
closeOrderRequest.setOutTradeNo("201802131509358989");
WechatPayRequestHandler requestHandler = new WechatPayRequestHandler(closeOrderRequest);
WechatCloseOrderResponse closeOrderResponse = (WechatCloseOrderResponse) requestHandler.process();

微信支付回调通知处理

WechatPayNotificationHandler handler = new WechatPayNotificationHandler(request.getInputStream(), response.getOutputStream());
WechatNotificationResponse result = (WechatNotificationResponse) handler.process();
handler.callBack("<xml><return_code><![CDATA[SUCCESS]]>" + "</return_code><return_msg><![CDATA[OK]]></return_msg></xml>");
handler.close();