[置顶] 微信公众号开发---退款（java）

微信公众号支付请看上一篇文章： 
http://blog.csdn.net/aofavx/article/details/52220394 

需要用到的java类都在： 
http://download.csdn.net/detail/aofavx/9606697

微信公众号退款相对支付来说就简单多了，唯一需要注意的地方就是：在支付的时候需要用到商户的证书。 

退款代码如下： 

jsp提交退款申请：

//退款
function refundWXPay() {
window.location.href="refundPay?orderId=${orderId}";
}

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java代码：

/**
*微信公众号申请退款
* @param orderId 订单id
* @param total_fee 退款金额
* @param refund_fee 退款金额
* @param response
* @return
* @throws Exception
*/
@RequestMapping(value="/refundPay")
@ResponseBody
private ModelAndView refundwx(HttpServletRequest request,HttpServletResponse response) throws Exception{
logBefore(logger, "退款");
ModelAndView mv = this.getModelAndView();
PageData pd = new PageData();
pd = this.getPageData();

/*--------1.初始化数据参数----------*/
String appId= "wxfd7c065eee11112222";
String secret= "b5b3a627f5d1f8888888888888";
String shh= "111111111;
String key= "mmmmmmmmmmmmmmm";
String filePath = "E:\\证书\\apiclient_cert.p12"; //退款需要提供证书数据，所以需要根据证书路径读取证书
//需要退款的商户订单号，对应提交订单中的out_trade_no
String orderId = request.getParameter("orderId").toString();
String total_fee=WeChat.getMoney(request.getParameter("total_fee"));  //也可以根据业务场景从数据库中获取总金额和退款金额
String refund_fee=WeChat.getMoney(request.getParameter("refund_fee"));
Map<String,String> result = (Map<String, String>) wxRefund(request,response,appId,secret,shh,key,orderId,total_fee,refund_fee,filePath);

/*
根据result的返回状态，处理你的业务逻辑
.....
*/

mv.setViewName("wechat/refundFind");
return mv;
}

private Object wxRefund(HttpServletRequest request,HttpServletResponse response,String appId,
String secret,String shh,String key,String orderId,String total_fee,String refund_fee,String path){
Map<String,String> result=new HashMap<String,String>();
PageData pd = new PageData();
pd = this.getPageData();
String refundid = UuidUtil.get32UUID();
String nonce_str = MD5.getMessageDigest(String.valueOf(new Random().nextInt(10000)).getBytes());

/*-----  1.生成预支付订单需要的的package数据-----*/
SortedMap<String, String> packageParams = new TreeMap<String, String>();
packageParams.put("appid", appId);
packageParams.put("mch_id", shh);
packageParams.put("nonce_str", nonce_str);
packageParams.put("op_user_id", shh);
packageParams.put("out_trade_no", orderId);
packageParams.put("out_refund_no", refundid);
packageParams.put("total_fee",total_fee);
packageParams.put("refund_fee", refund_fee);
/*----2.根据package生成签名sign---- */
RequestHandler reqHandler = new RequestHandler(request, response);
reqHandler.init(appId, secret, key);
String sign = reqHandler.createSign(packageParams);

/*----3.拼装需要提交到微信的数据xml---- */
String xml="<xml>"
+"<appid>"+appId+"</appid>"
+ "<mch_id>"+shh+"</mch_id>"
+ "<nonce_str>"+nonce_str+"</nonce_str>"
+ "<op_user_id>"+shh+"</op_user_id>"
+ "<out_trade_no>"+orderId+"</out_trade_no>"
+ "<out_refund_no>"+refundid+"</out_refund_no>"
+ "<refund_fee>"+refund_fee+"</refund_fee>"
+ "<total_fee>"+total_fee+"</total_fee>"
+ "<sign>"+sign+"</sign>"
+"</xml>";
try {
/*----4.读取证书文件,这一段是直接从微信支付平台提供的demo中copy的，所以一般不需要修改---- */
KeyStore keyStore  = KeyStore.getInstance("PKCS12");
FileInputStream instream = new FileInputStream(new File(path));
try {
keyStore.load(instream, shh.toCharArray());
} finally {
instream.close();
}
// Trust own CA and all self-signed certs
SSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(keyStore, shh.toCharArray()).build();
// Allow TLSv1 protocol only
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext,new String[] { "TLSv1" },null,
SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(sslsf).build();

/*----5.发送数据到微信的退款接口---- */
String url="https://api.mch.weixin.qq.com/secapi/pay/refund";
HttpPost httpost= HttpClientConnectionManager.getPostMethod(url);
httpost.setEntity(new StringEntity(xml, "UTF-8"));
HttpResponse weixinResponse = httpClient.execute(httpost);
String jsonStr = EntityUtils.toString(weixinResponse.getEntity(), "UTF-8");
logger.info(jsonStr);

Map map = GetWxOrderno.doXMLParse(jsonStr);
if("success".equalsIgnoreCase((String) map.get("return_code"))){
logger.info("退款成功");
result.put("returncode", "ok");
result.put("returninfo", "退款成功");
}else{
logger.info("退款失败");
result.put("returncode", "error");
result.put("returninfo", "退款失败");
}
} catch (Exception e) {
logger.info("退款失败");
result.put("returncode", "error");
result.put("returninfo", "退款失败");
}
return result;

}