微信公众号开发之关注推送图文消息

关注/取消关注事件

用户在关注与取消关注公众号时，微信会把这个事件推送到开发者填写的URL。方便开发者给用户下发欢迎消息或者做帐号的解绑。

微信服务器在五秒内收不到响应会断掉连接，并且重新发起请求，总共重试三次。

关于重试的消息排重，推荐使用FromUserName + CreateTime 排重。

假如服务器无法保证在五秒内处理并回复，可以直接回复空串，微信服务器不会对此作任何处理，并且不会发起重试。

推送XML数据包示例：

<xml><ToUserName>< ![CDATA[toUser] ]></ToUserName><FromUserName>< ![CDATA[FromUser] ]></FromUserName><CreateTime>123456789</CreateTime><MsgType>< ![CDATA[event] ]></MsgType><Event>< ![CDATA[subscribe] ]></Event></xml>

参数说明：

回复图文消息

<xml><ToUserName>< ![CDATA[toUser] ]></ToUserName><FromUserName>< ![CDATA[fromUser] ]></FromUserName><CreateTime>12345678</CreateTime><MsgType>< ![CDATA[news] ]></MsgType><ArticleCount>2</ArticleCount><Articles><item><Title>< ![CDATA[title1] ]></Title> <Description>< ![CDATA[description1] ]></Description><PicUrl>< ![CDATA[picurl] ]></PicUrl><Url>< ![CDATA[url] ]></Url></item><item><Title>< ![CDATA[title] ]></Title><Description>< ![CDATA[description] ]></Description><PicUrl>< ![CDATA[picurl] ]></PicUrl><Url>< ![CDATA[url] ]></Url></item></Articles></xml>

详细代码如下 News.java

public class News {private String Title;//图文标题private String Description;//图文描述private String PicUrl;//图片链接，支持JPG、PNG格式，较好的效果为大图360*200，小图200*200private String Url;//点击图文消息跳转链接public News(String title, String description, String picUrl, String url) {this.Title = title;this.Description = description;this.PicUrl = picUrl;this.Url = url;}public News(){super();}public String getTitle() {return Title;}public void setTitle(String title) {this.Title = title;}public String getDescription() {return Description;}public void setDescription(String description) {this.Description = description;}public String getPicUrl() {return PicUrl;}public void setPicUrl(String picUrl) {this.PicUrl = picUrl;}public String getUrl() {return Url;}public void setUrl(String url) {this.Url = url;}}

NewsMessage.java

public class NewsMessage extends BaseMessage {private int ArticleCount;//图文消息个数，限制为8条以内private List<News> Articles;//多条图文消息信息，默认第一个item为大图,注意，如果图文数超过8，则将会无响应public NewsMessage(String toUserName, String fromUserName, Long createTime, String msgType, Integer articleCount, List<News> articles) {super(toUserName, fromUserName, createTime, msgType);this.ArticleCount = articleCount;this.Articles = articles;}public NewsMessage() {super();}public int getArticleCount() {return ArticleCount;}public void setArticleCount(int articleCount) {this.ArticleCount = articleCount;}public List<News> getArticles() {return Articles;}public void setArticles(List<News> articles) {this.Articles = articles;}}

初始化图文消息：

/*** 初始化图文消息*/public static String initNewsMessage(String toUSerName, String fromUserName) {List<News> newsList = new ArrayList<News>();NewsMessage newsMessage = new NewsMessage();//组建一条图文↓ ↓ ↓News newsItem = new News();newsItem.setTitle("欢迎关注我的公众号");newsItem.setDescription("进行操作之前请先注册！");newsItem.setPicUrl(WXConstants.BASE_SERVER + "/image/wx/login_article_cover.png");newsItem.setUrl("https://open./connect/oauth2/authorize?appid=" + WXConstants.APPID + "&redirect_uri=" + WXConstants.BASE_SERVER + "/wxuser/toRegister&response_type=code&scope=snsapi_base&state=BINDFACE#wechat_redirect");newsList.add(newsItem);//组装图文消息相关信息newsMessage.setToUserName(fromUserName);newsMessage.setFromUserName(toUSerName);newsMessage.setCreateTime(new Date().getTime());newsMessage.setMsgType(WXConstants.MESSAGE_NEWS);newsMessage.setArticles(newsList);newsMessage.setArticleCount(newsList.size());//调用newsMessageToXml将图文消息转化为XML结构并返回return MessageUtil.newsMessageToXml(newsMessage);}/*** 图文消息转XML结构方法*/public static String newsMessageToXml(NewsMessage message) {XStream xs = new XStream();//由于转换后xml根节点默认为class类，需转化为<xml>xs.alias("xml", message.getClass());xs.alias("item", new News().getClass());return xs.toXML(message);}

测试关注：

@Controller@RequestMapping("/wechat")public class WxController {private final static String MEDIATYPE_CHARSET_JSON_UTF8 = MediaType.APPLICATION_JSON_VALUE + ";charset=UTF-8";private static Logger log = LoggerFactory.getLogger(WxController.class);@RequestMapping(value = "/chat", method = {RequestMethod.GET, RequestMethod.POST}, produces = MEDIATYPE_CHARSET_JSON_UTF8)public void get(HttpServletRequest request, HttpServletResponse response) throws Exception {//如果为get请求，则为开发者模式验证if ("get".equals(request.getMethod().toLowerCase())) {doGet();//在开发者模式验证中已处理，在此省略} else {request.setCharacterEncoding("UTF-8");response.setCharacterEncoding("UTF-8");PrintWriter out = response.getWriter();try {Map<String, String> map = MessageUtil.xmlToMap(request);String ToUserName = map.get("ToUserName");String FromUserName = map.get("FromUserName");request.getSession().setAttribute("openid",FromUserName);String CreateTime = map.get("CreateTime");String MsgType = map.get("MsgType");String message = null;if (MsgType.equals(WXConstants.MESSAGE_EVENT)) {//从集合中，获取是哪一种事件传入String eventType = map.get("Event");if (eventType.equals(WXConstants.MESSAGE_SUBSCRIBE)) {message = MessageUtil.initNewsMessage(ToUserName, FromUserName);}}out.print(message); //返回转换后的XML字符串} catch (DocumentException e) {e.printStackTrace();}out.close();}}}

关注测试号，弹出如下结果：

如果觉得《微信公众号开发之关注推送图文消息》对你有帮助，请点赞、收藏，并留下你的观点哦！