WeChat 공개 계정 결제 개발(java) 사례에 대한 자세한 설명

public String return_data(HttpServletRequest request, HttpServletResponse response) throws Exception {
        logger.info("微信支付请求回调了");
        String resXml = "";
        Map<String, String> backxml = new HashMap<String, String>();
        InputStream inStream;try {
            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);
            }
            outSteam.close();
            inStream.close();
            String result = new String(outSteam.toByteArray(), "utf-8");// 获取微信调用我们notify_url的返回信息Map<String, String> map = WXPayUtil.xmlToMap(result);if (map.get("result_code").toString().equalsIgnoreCase("SUCCESS")) {if (WXPayUtil.isSignatureValid(map, PayConfigUtil.API_KEY)) {
                    logger.info("微信支付-签名验证成功");//                    backxml.put("return_code", "SUCCESS");//                    backxml.put("return_msg", "OK");//                    String toXml = WXPayUtil.mapToXml(backxml);//                    response.getWriter().write(toXml);resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"+ "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";//业务处理开始                   //业务处理结束                }
                BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());out.write(resXml.getBytes());out.flush();out.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }return resXml;
    }