java web 微信认证订阅 获取openid

接手一个微信h5项目，对方提供一个已认证的微信订阅号，需要参与活动的用户必须为已关注该订阅号的会员。

已知：查询微信官方文档，订阅号是没有直接获取用户openid的接口，

解决方案：通过自定义菜单来获取用户openid，在点击自定义菜单时用户返回一个FromUserName，这个就是openid

1.接入微信公众号 ，在公众号启用开发者，修改配置，获取微信tocken

java :

@RequestMapping(value = "/autoToken", method = RequestMethod.GET)public void autoToken(HttpServletResponse response) {if (!WxApiUtil.accessing(request, response)) {return;}String echostr = request.getParameter("echostr");if (StringUtils.isNotEmpty(echostr)) {try {response.setContentType("text/html; charset=utf-8");response.getWriter().print(echostr);response.getWriter().flush();} catch (IOException e) {e.printStackTrace();}}}public static boolean accessing(HttpServletRequest request,HttpServletResponse response) {String Token = "weixin";String signature = request.getParameter("signature");String timestamp = request.getParameter("timestamp");String nonce = request.getParameter("nonce");String echostr = request.getParameter("echostr");if (StringUtils.isEmpty(signature) || StringUtils.isEmpty(timestamp)|| StringUtils.isEmpty(nonce) || StringUtils.isEmpty(echostr)) {return false;}String[] ArrTmp = { Token, timestamp, nonce };Arrays.sort(ArrTmp);StringBuffer sb = new StringBuffer();for (int i = 0; i < ArrTmp.length; i++) {sb.append(ArrTmp[i]);}String pwd = Encrypt(sb.toString());LOG.info("signature:" + signature + "timestamp:" + timestamp + "nonce:"+ nonce + "pwd:" + pwd + "echostr:" + echostr);if (StringUtils.trim(pwd).equals(StringUtils.trim(signature))) {return true;} else {return false;}}private static String Encrypt(String strSrc) {MessageDigest md = null;String strDes = null;byte[] bt = strSrc.getBytes();try {md = MessageDigest.getInstance("SHA-1");md.update(bt);strDes = bytes2Hex(md.digest()); // to HexString} catch (NoSuchAlgorithmException e) {System.out.println("Invalid algorithm.");return null;}return strDes;}public static String bytes2Hex(byte[] bts) {String des = "";String tmp = null;for (int i = 0; i < bts.length; i++) {tmp = (Integer.toHexString(bts[i] & 0xFF));if (tmp.length() == 1) {des += "0";}des += tmp;}return des;}

2.接入成功后，写一个post接口，接收微信服务器推送的消息，与公众号上填写的连接一致，不过接入时使用get接口，接收信息时使用post接口，

@RequestMapping(value = "/autoToken", method = RequestMethod.POST)public void autoToken2(HttpServletResponse response) {try {BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream) request.getInputStream()));String line = null;StringBuffer sb = new StringBuffer();while ((line = br.readLine()) != null) {sb.append(line);}String xml = sb.toString();manageMessage(xml, request, response);} catch (Exception e) {e.printStackTrace();}}private void manageMessage(String xml, HttpServletRequest request, HttpServletResponse response) throws Exception {String responseStr = "";try {LOG.info(xml);Map<String, String> map = WxApiUtil.getMapFromXML(xml);String event = map.get("Event");String msgtype = map.get("MsgType");String eventkey = map.get("EventKey");String openid = map.get("FromUserName");if ("CLICK".equals(event) && "event".equals(msgtype)) { // 菜单click事件switch (eventkey) {case "111":map.put("Content", "<a href=\"http://www.xxxx.com/actvity1/index.html?openid=" + openid+ "\">活动连接</a>");responseStr = WxApiUtil.creatRevertText(map);// 创建XMLbreak;default:map.put("Content","Hello，欢迎关注我们");responseStr = WxApiUtil.creatRevertText(map);// 创建XMLbreak;}}if (StringUtils.isEmpty(responseStr)) {map.put("Content","Hello，欢迎关注我们");responseStr = WxApiUtil.creatRevertText(map);// 创建XML}LOG.info(responseStr);response.setContentType("text/html; charset=utf-8");response.getWriter().write(responseStr);response.getWriter().flush();} catch (Exception e) {e.printStackTrace();}}public static String creatRevertText(Map<String, String> map) {StringBuffer revert = new StringBuffer();revert.append("<xml>");revert.append("<ToUserName><![CDATA[" + map.get("FromUserName")+ "]]></ToUserName>");revert.append("<FromUserName><![CDATA[" + map.get("ToUserName")+ "]]></FromUserName>");revert.append("<CreateTime>" + map.get("CreateTime") + "</CreateTime>");revert.append("<MsgType><![CDATA[text]]></MsgType>");revert.append("<Content><![CDATA[" + map.get("Content")+ "]]></Content>");revert.append("</xml>");return revert.toString();}

3.创建自定义菜单，

String body = "{\"button\":[{\"type\":\"click\",\"name\":\"test\",\"key\":\"111\"}]}";String jsonStr = WxApiUtil.createMenu(request, wxEntity, body);public static String createMenu(HttpServletRequest request, WxEntity wx,String body) {String json = "";try {String key1 = "accessToken" + wx.getId();ServletContext context = request.getSession().getServletContext();String accessToken = (String) context.getAttribute(key1);if (StringUtils.isEmpty(accessToken)) {accessToken = getAccessToken(wx);context.setAttribute(key1, accessToken);System.out.println(DateUtils.format(new Date(),DateUtils.DATETIME_FORMAT)+ "-------"+ key1+ " 超时，重新获取--------" + accessToken);}String url = menucreateUrl.replace("ACCESS_TOKEN1", accessToken);json = EHttpUtil.getPostContent(url, body);} catch (Exception e) {e.printStackTrace();}return json;}

结束。

注意点：接入微信和创建菜单都是一步就过，没什么需要注意的，在接收微信消息并返回时注意调换 FromUserName 和 ToUserName，点击自定义菜单可以返回的消息类型不局限于文本，还可以是其他类型，通常回复图文消息，方法如下：

public static String creatRevertNews(Map<String, String> map) {StringBuffer revert = new StringBuffer();revert.append("<xml>");revert.append("<ToUserName><![CDATA[" + map.get("FromUserName")+ "]]></ToUserName>");revert.append("<FromUserName><![CDATA[" + map.get("ToUserName")+ "]]></FromUserName>");revert.append("<CreateTime>" + map.get("CreateTime") + "</CreateTime>");revert.append("<MsgType><![CDATA[news]]></MsgType><ArticleCount>1</ArticleCount>");revert.append("<Articles>");revert.append("<item>");revert.append("<Title><![CDATA[" + map.get("Title")+ "]]></Title>");revert.append("<Description><![CDATA[" + map.get("Description")+ "]]></Description>");revert.append("<PicUrl><![CDATA[" + map.get("PicUrl")+ "]]></PicUrl>");revert.append("<Url><![CDATA[" + map.get("Url")+ "]]></Url>");revert.append("</item>");revert.append("</Articles>");revert.append("</xml>");return revert.toString();}

记录开发过程中的点滴！

代码code片断为什么不能用了，而且格式都没了！！！