微信支付的回调

后台接受

InputStream inStream = request.getInputStream(); ByteArrayOutputStream outSteam = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = 0; while ((len = inStream.read(buffer)) != -1) {    outSteam.write(buffer, 0, len); } String resultxml = new String(outSteam.toByteArray(), "utf-8"); Map wxRetMap = PayCommonUtil.doXMLParse(resultxml); outSteam.close(); inStream.close(); // 当返回的return_code为SUCCESS则回调成功       if ("SUCCESS".equalsIgnoreCase(wxRetMap.get("return_code"))) {           // 通知微信收到回调           String resXml = "";           BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());           out.write(resXml.getBytes());           out.flush();           out.close();     /**     * 执行业务代码     *     */    try {       ///保存流水业务       //附加数据 用户id json {user_id:'1'}       String userId = wxRetMap.get("attach");//attach为xml标签名称 } catch (Exception e) {    logger.error(e.getMessage());    e.printStackTrace(); }    ------------------------------------------------------------------------xml----------------------------------------参数名称-------------------------------------                 1