Java 修改微信公众号后台服务器地址URL后，微信公众平台客服功能接收不到用户发送的消息的解决办法

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解决办法：
检查一下微信回调URL是否转发了客服消息。

/*** 处理具体的回调信息*/
@PostMapping("/callback")
public void callback(@RequestParam(name = "signature", required = false) String signature,@RequestParam(name = "timestamp", required = false) String timestamp,@RequestParam(name = "nonce", required = false) String nonce,@RequestParam(name = "echostr", required = false) String echostr,@RequestParam(name = "openid", required = false) String openid,@RequestBody String msg,HttpServletResponse response) {log.info("处理具体的回调信息");log.info("======微信回调msg======：" +msg);try {weChatService.handleWxCallBackMsg(msg, response);} catch (Exception e) {log.info("handleWxCallBackMsg", e);}
}

public void handleWxCallBackMsg(String msg, HttpServletResponse response) {try {Document document = XmlUtil.readXML(msg);String msgType = String.valueOf(XmlUtil.getByXPath("//MsgType", document, XPathConstants.STRING));if ("text".equals(msgType)) {handleWxTextCallBack(document, response);}} catch (Exception e) {log.info("handleWxCallBackMsg_error:", e);}
}

private void handleWxTextCallBack(Document document, HttpServletResponse response) throws Exception {log.info("======进入微信消息处理回调======");String fromUserName = String.valueOf(XmlUtil.getByXPath("//FromUserName", document, XPathConstants.STRING));String toUserName = String.valueOf(XmlUtil.getByXPath("//ToUserName", document, XPathConstants.STRING));String createTime = String.valueOf(XmlUtil.getByXPath("//CreateTime", document, XPathConstants.STRING));String xml = String.format("""<xml><ToUserName><![CDATA[%s]]></ToUserName><FromUserName><![CDATA[%s]]></FromUserName><CreateTime>%s</CreateTime><MsgType><![CDATA[transfer_customer_service]]></MsgType></xml>""", fromUserName, toUserName, createTime);response.setContentType("text/xml;charset=UTF-8");response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0);response.getOutputStream().print(xml);
}