java实现微信支付结果通知

支付完成后，微信会把相关支付结果和用户信息发送给商户，商户需要接收处理，并返回应答。

对后台通知交互时，如果微信收到商户的应答不是成功或超时，微信认为通知失败，微信会通过一定的策略定期重新发起通知，尽可能提高通知的成功率，但微信不保证通知最终能成功。 （通知频率为15/15/30/180/1800/1800/1800/1800/3600，单位：秒）

注意：同样的通知可能会多次发送给商户系统。商户系统必须能够正确处理重复的通知。
推荐的做法是，当收到通知进行处理时，首先检查对应业务数据的状态，判断该通知是否已经处理过，如果没有处理过再进行处理，如果处理过直接返回结果成功。在对业务数据进行状态检查和处理之前，要采用数据锁进行并发控制，以避免函数重入造成的数据混乱。

特别提醒：商户系统对于支付结果通知的内容一定要做签名验证，防止数据泄漏导致出现“假通知”，造成资金损失。

//支付结果通知接口

  @RequestMapping("/qlydweixinotify.do")
  public void weixinotify(HttpServletRequest request,
      HttpServletResponse response) {
    PrintWriter out = null;
    StringBuffer xmlStr = new StringBuffer();
    try {
      BufferedReader reader = request.getReader();
      String line = null;
      while ((line = reader.readLine()) != null) {
 xmlStr.append(line);
      }  
      Logger.getLogger(getClass()).debug("支付回调通知："+xmlStr.toString());
      //检查xml是否有效
      boolean flag=Signature.checkIsSignValidFromResponseString(xmlStr.toString());
      WeixinNotifyResult result=null;
      if(flag){
 NotifyResData wxData=(NotifyResData) Util.getObjectFromXML(xmlStr.toString(),NotifyResData.class);
 if(wxData !=null){
   if("SUCCESS".equals(wxData.getReturn_code())&&"SUCCESS".equals(wxData.getResult_code())){
     OrderPayInfo orderPayInfo = new OrderPayInfo();
     orderPayInfo.setOrderNum(wxData.getOut_trade_no());
     orderPayInfo.setPayNum(wxData.getTransaction_id());
     orderPayInfo.setPayPrice((double)wxData.getTotal_fee()/100+"");
     orderPayInfo.setPaySource(wxData.getOpenid());
     orderPayInfo.setPayTime(wxData.getTime_end());
     orderPayInfo.setPayType("2");//1支付宝，2微信支付
     OrderMessage returnMessage = orderProductServer
  .completeProductOrder(orderPayInfo);
     if (OrderStatus.FAIL.equals(returnMessage
  .getOrderStatus())) {
Logger.getLogger(getClass()).error("远程接口完成订单失败");
result=new WeixinNotifyResult("FAIL");
result.setReturn_msg("远程接口完成订单失败");
     } else {
result=new WeixinNotifyResult("SUCCESS");
result.setReturn_msg("成功");
     }
   }else{
     result=new WeixinNotifyResult("FAIL");
     result.setReturn_msg("失败");
   }
 }else{
   result=new WeixinNotifyResult("FAIL");
   result.setReturn_msg("解析参数格式失败");
 }
      }else{
 result=new WeixinNotifyResult("FAIL");
 result.setReturn_msg("签名失败");
      }
      response.getWriter().write(result.toString());
    } catch (Exception e) {
      Logger.getLogger(getClass()).error("qlydweixinotify.do", e);
      ResponeDeal.getInstance().sendResponseStr(response, "404", "连接超时");
    } finally {
      if (out != null) {
 out.close();
      }
    }
  }

模拟http请求工具类：

HttpsRequestUtil.java

package com.qlwb.weixin.util;
 
import java.io.IOException;
 
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;
import org.apache.commons.httpclient.methods.StringRequestEntity;
import org.apache.log4j.Logger;
 
import com.qlwb.weixin.common.Configure;
import com.qlwb.weixin.common.Util;
import com.qlwb.weixin.protocol.pay_protocol.WxPayReqData;
import com.qlwb.weixin.protocol.payquery_protocol.PayQueryReqData;
 
public class HttpsRequestUtil {
 
  
  public String sendWxPayRequest(String body,String detail,String outTradeNo,int totalFee,String spBillCreateIP
      )
 
  {
    // 构造HTTP请求
    HttpClient httpclient = new HttpClient();
 
    PostMethod postMethod = new PostMethod(Configure.PAY_API);
 
    WxPayReqData wxdata = new WxPayReqData(body,detail,outTradeNo,totalFee,spBillCreateIP);
 
    String requestStr="";
    requestStr=Util.ConvertObj2Xml(wxdata);
    // 发送请求
    String strResponse = null;
    try {
      RequestEntity entity = new StringRequestEntity(
   requestStr.toString(), "text/xml", "UTF-8");
      postMethod.setRequestEntity(entity);
      httpclient.executeMethod(postMethod);
      strResponse = new String(postMethod.getResponseBody(), "utf-8");
      Logger.getLogger(getClass()).debug(strResponse);
    } catch (HttpException e) {
      Logger.getLogger(getClass()).error("sendWxPayRequest", e);
    } catch (IOException e) {
      Logger.getLogger(getClass()).error("sendWxPayRequest", e);
    } finally {
      postMethod.releaseConnection();
    }
    return strResponse;
  }
  
  public String orderQueryRequest(String transactionID, String outTradeNo
      )
 
  {
    // 构造HTTP请求
    HttpClient httpclient = new HttpClient();
 
    PostMethod postMethod = new PostMethod(Configure.PAY_QUERY_API);
 
    PayQueryReqData wxdata = new PayQueryReqData(transactionID,outTradeNo);
 
    String requestStr="";
    requestStr=Util.ConvertObj2Xml(wxdata);
    // 发送请求
    String strResponse = null;
    try {
      RequestEntity entity = new StringRequestEntity(
   requestStr.toString(), "text/xml", "UTF-8");
      postMethod.setRequestEntity(entity);
      httpclient.executeMethod(postMethod);
      strResponse = new String(postMethod.getResponseBody(), "utf-8");
 
    } catch (HttpException e) {
      Logger.getLogger(getClass()).error("orderQueryRequest", e);
    } catch (IOException e) {
      Logger.getLogger(getClass()).error("orderQueryRequest", e);
    } finally {
      postMethod.releaseConnection();
    }
    return strResponse;
  }
}

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