微信公众号退款java代码(整理)

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}";}

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;    }