APP微信支付的后台实现

参阅微信支付文档：https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8_5

这一部分说的已经很详细了；

1.app将订单信息传给自己的后台服务；

2.后台服务接受到订单信息后，构建预支付信息，回传给APP；

接下来的过程是：

3.app获取预支付信息。调起微信支付，完成支付；

4.微信同步返回，接收通知给APP；异步调用我方后台服务提供的接口。返回成功或失败的处理结果；

贴一段别人实现的代码：

package com.epeit.api.service.wechatPay.wxpay;import com.epeit.api.annotations.FunctionCode;
import com.epeit.api.dao.ShoppingOrderMapper;
import com.epeit.api.dao.TenpayParamsMapper;
import com.epeit.api.dao.UserAddressMapper;
import com.epeit.api.dao.WxpayInfoMapper;
import com.epeit.api.dto.ApiRequest;
import com.epeit.api.dto.ApiResponse;
import com.epeit.api.enums.RestResultEnum;
import com.epeit.api.model.ShoppingOrderPo;
import com.epeit.api.model.TenpayParams;
import com.epeit.api.model.UserAddressPo;
import com.epeit.api.model.WxpayInfo;
import com.epeit.api.service.inner.CommonService;
import com.epeit.api.service.wechatPay.RequestHandler;
import com.epeit.api.service.wechatPay.client.TenpayHttpClient;
import com.epeit.api.service.wechatPay.util.Sha1Util;
import com.epeit.api.service.wechatPay.util.TenpayUtils;
import com.epeit.api.service.wechatPay.util.WxPayConfig;
import com.epeit.api.util.SerialNumberUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.*;/*** Created by user on 2015/3/11.*/
@FunctionCode(value = "wxPay", descript = "微信支付相关接口")
@Service
public class WxPayServiceImpl implements WxPayService {@Autowiredprivate WxpayInfoMapper wxpayInfoMapper;@Autowiredprivate TenpayParamsMapper tenpayParamsMapper;@Autowiredprivate ShoppingOrderMapper shoppingOrderMapper;@Autowiredprivate UserAddressMapper userAddressMapper;@Value("${epeit.api.server}")private String defaultApiServer;private TenpayParams tenpayParams;@FunctionCode(value = "wxPay.wxPayGoods", descript = "支付订单处理接口")@Overridepublic ApiResponse<Map<String, String>> wxPayGoods(ApiRequest apiRequest) {Object  userIdObj = apiRequest.get("userId");Object  orderCodeObj = apiRequest.get("orderCode");Object  deviceInfoObj = apiRequest.get("deviceInfo");Object  userIpObj = apiRequest.get("userIp");if (StringUtils.isEmpty(userIdObj)||StringUtils.isEmpty(orderCodeObj)) {return new ApiResponse<Map<String, String>>(RestResultEnum.MissParameterException);}ApiResponse<Map<String, String>> apiResponse =null;//支付单生成try {TenpayParams tenpayParams = this.tenpayParamsMapper.selectTenPayParamsByorderCode(orderCodeObj.toString());if(tenpayParams!=null){Map<String, String> outParams = new HashMap<String, String>();//输出参数outParams.put("retcode", "0");outParams.put("retmsg", "OK");outParams.put("appid", tenpayParams.getAppid());outParams.put("partnerid", tenpayParams.getPartnerid());outParams.put("noncestr", tenpayParams.getNoncestr());outParams.put("package", "Sign=WXPay");outParams.put("prepayid", tenpayParams.getPrepayid());outParams.put("timestamp", tenpayParams.getTimestamp());outParams.put("sign", tenpayParams.getSign());outParams.put("orderCode",orderCodeObj.toString());apiResponse = new ApiResponse<Map<String, String>>(RestResultEnum.SUCCESS, 1, outParams);}else{String userId = userIdObj.toString();//根据用户ID获取到该用户的地址UserAddressPo userAddressPo = this.userAddressMapper.queryUserAddressByUserId(Long.valueOf(userId.toString()));HashMap<String,Object> hashMap2 = new HashMap<String, Object>();hashMap2.put("orderCode",orderCodeObj.toString());ShoppingOrderPo shoppingOrderPo =  this.shoppingOrderMapper.selectShoppingOrderByOrderCode(hashMap2);String totalPrice =shoppingOrderPo.getFinalPrice().toString();//最总价格作为实际支付的价格Double fiprice = Double.valueOf(totalPrice)*100;Integer price = (int)Math.round(fiprice);//判断价格不能低于1分钱if(price>=1){totalPrice = price.toString();String body = "";WxpayInfo wxpayInfo = new WxpayInfo();wxpayInfo.setWxpayCode(orderCodeObj.toString());wxpayInfo.setTotalfee(Double.valueOf(totalPrice));wxpayInfo.setPayState(0);//支付未成功--等待微信支付完成的异步通知wxpayInfo.setAttach("");if(!StringUtils.isEmpty(deviceInfoObj)){wxpayInfo.setDeviceinfo(deviceInfoObj.toString());}wxpayInfo.setUserid(Integer.valueOf(userIdObj.toString()));if(!StringUtils.isEmpty(userIpObj)){wxpayInfo.setUserip(userIpObj.toString());}wxpayInfo.setTimestart(new Date());wxpayInfo.setOrderAddress(userAddressPo.getAddress());wxpayInfo.setGoodstag("");wxpayInfo.setBody(body);this.wxpayInfoMapper.insertSelective(wxpayInfo);HttpServletRequest request = apiRequest.getRequest();HttpServletResponse response = apiRequest.getResponse();//获取提交的商品价格String order_price = totalPrice;//获取提交的商品名称String product_name = body;Map<String, String> outParams = new HashMap<String, String>();RequestHandler reqHandler = new RequestHandler(request, response);TenpayHttpClient httpClient = new TenpayHttpClient();//初始化reqHandler.init();reqHandler.init(WxPayConfig.app_id,WxPayConfig.partner, WxPayConfig.partner_key);//=========================//生成预支付单//=========================String noncestr = Sha1Util.getNonceStr();//设置package订单参数SortedMap<String, String> packageParams = new TreeMap<String, String>();packageParams.put("appid", WxPayConfig.app_id);packageParams.put("body",WxPayConfig.body ); //商品描述packageParams.put("mch_id", WxPayConfig.partner); //商户号packageParams.put("nonce_str", noncestr);packageParams.put("notify_url", defaultApiServer+"/wxPay/wxPayNotify"); //接收财付通通知的URLpackageParams.put("out_trade_no", orderCodeObj.toString()); //商家订单号packageParams.put("spbill_create_ip", request.getRemoteAddr()); //订单生成的机器IP，指用户浏览器端IPpackageParams.put("total_fee", order_price); //商品金额,以分为单位packageParams.put("trade_type", "APP"); //商品描述String timestamp = Sha1Util.getTimeStamp();packageParams.put("time_start", timestamp); //字符编码//获取prepayIdString prepayid = reqHandler.sendPrepay(packageParams);if (null != prepayid && !"".equals(prepayid)) {//签名参数列表Map<String,String> map =new HashMap<String, String>();map.put("appid",WxPayConfig.app_id);map.put("noncestr",noncestr);map.put("package","Sign=WXPay");map.put("partnerid",WxPayConfig.partner);map.put("prepayid",prepayid);map.put("timestamp",timestamp);/* 统一下单接口返回正常的prepay_id，再按签名规范重新生成签名后，将数据传输给APP。参与签名的字段名为appId，partnerId，prepayId，nonceStr，timeStamp，package。注意：package的值格式为prepay_id=wx20141009175351724b348a500087751557*///生成签名System.out.println("**********:"+map.toString());String sign = TenpayUtils.createSign(map);//输出参数outParams.put("retcode", "0");outParams.put("retmsg", "OK");outParams.put("appid", WxPayConfig.app_id);outParams.put("partnerid", WxPayConfig.partner);outParams.put("noncestr", noncestr);outParams.put("package", "Sign=WXPay");outParams.put("prepayid", prepayid);outParams.put("timestamp", timestamp);outParams.put("sign", sign);outParams.put("orderCode",orderCodeObj.toString());} else {outParams.put("retcode", "-2");outParams.put("retmsg", "错误：获取prepayId失败");}this.insertTenpayParams(outParams);response.resetBuffer();response.setHeader("ContentType", "text/json");apiResponse=new ApiResponse<Map<String, String>>(RestResultEnum.SUCCESS,1,outParams);}else{apiResponse=new ApiResponse<Map<String,String>>(RestResultEnum.CheckMoney);}}}catch (Exception ex){ex.printStackTrace();apiResponse=new ApiResponse<Map<String,String>>(RestResultEnum.UNKNOW_ERROR);}return apiResponse;}/*** 再次支付未付款订单的调用方法** @param apiRequest* @return*/@FunctionCode(value = "wxPay.payAgain", descript = "再次支付未付款订单的调用方法")@Overridepublic ApiResponse<TenpayParams> payAgain(ApiRequest apiRequest) {Object orderCodeObj = apiRequest.get("orderCode");if (StringUtils.isEmpty(orderCodeObj)) {return new ApiResponse<TenpayParams>(RestResultEnum.MissParameterException);}ApiResponse<TenpayParams> apiResponse = null;try {TenpayParams tenpayParams = this.tenpayParamsMapper.selectTenPayParamsByorderCode(orderCodeObj.toString());//如果支付成功则调用此接口，并将订单的数据拆解存储对应的数据表apiResponse = new ApiResponse<TenpayParams>(RestResultEnum.SUCCESS, 1, tenpayParams);} catch (Exception ex) {apiResponse = new ApiResponse<TenpayParams>(RestResultEnum.UNKNOW_ERROR);}return apiResponse;}private void insertTenpayParams(Map<String, String> tenpayParams) {TenpayParams tenpayParams1 = new TenpayParams();tenpayParams1.setAppid(tenpayParams.get("appid"));tenpayParams1.setNoncestr(tenpayParams.get("noncestr"));tenpayParams1.setPartnerid(tenpayParams.get("partnerid"));tenpayParams1.setPrepayid(tenpayParams.get("prepayid"));tenpayParams1.setRetcode(tenpayParams.get("retcode"));tenpayParams1.setRetmsg(tenpayParams.get("retmsg"));tenpayParams1.setSign(tenpayParams.get("sign"));tenpayParams1.setTimestamp(tenpayParams.get("timestamp"));tenpayParams1.setWxpayPackage(tenpayParams.get("package"));tenpayParams1.setOrderCode(tenpayParams.get("orderCode"));this.tenpayParamsMapper.insertSelective(tenpayParams1);//新增微信支付认证信息}
}

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