代码拉取完成，页面将自动刷新
微信企业号官方文档详细说明回调模式是以下四种 ：
但是代码却自动获取 corpid和appid 两个参数 这样会报错的
@RequestMapping(params="wechat", method = RequestMethod.GET)
public void wechatGet(HttpServletRequest request,
HttpServletResponse response,
@RequestParam(value = "msg_signature") String msg_signature,
@RequestParam(value = "timestamp") String timestamp,
@RequestParam(value = "nonce") String nonce,
@RequestParam(value = "echostr") String echostr,
@RequestParam(value = "corpid") String corpid,
@RequestParam(value = "appid") Integer appid)
