利用微信公众平台实现自动回复消息—java版

最近公司需要拿微信公众平台做个东西，所以就开始了最基本学习，网上很多是php版的，对于我这个只会java，不会php的就只能在网上找点只言片语来一点一点学习了。不费话了直接贴图看效果（很简单的）。

不会做关注时就回复信息，所以必须先发送“？”，才能出现提示。回复“1”和“其他”都是返回文字信息，“2”是音乐信息，“3”是图文信息。

好了，下面进入正题。

1、首先必须开通微信公中平台，还得申请到高级功能的（这个点比较坑，我等了两天才申请到的），关于申请公众平台我就不说了，网上很多介绍，自己看吧。

2、必须有自己的服务器资源，因为公众平台开发者模式开启时，必须填写接口配置信息（成为开发者）。

服务器资源我是用的是百度开发者中心来创建自己的应用。百度开发者中心：http://developer.baidu.com/

成为微信公众平台开发者前必须发布好自己的服务器资源，因为微信服务器将发送GET请求到填写的URL上（后面详细介绍）。

3、创建自己的应用。

这是整个项目结构。

下面逐一介绍：

 public class WbChat extends HttpServlet{

     private static final long serialVersionUID = 1L;

     public WbChat() {
         super();
     }
     @Override
     protected void doGet(HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {
         //这里没有对发送信息者进行验证，直接返回了，要加验证的话自己去百度吧
         response.setContentType("text/html;charset=UTF-8");
         PrintWriter pw = response.getWriter();
         String echo = request.getParameter("echostr");
         echo = new String(echo.getBytes("ISO-8859-1"),"UTF-8");
         pw.println(echo);
         //当你提交成为开发者的URL和Token时，微信服务器将发送GET请求到填写的URL上，
         //只有你返回参数echostr时，他才会认为你这个接口是通的，才会提交成功
     }

     @Override
     protected void doPost(HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {
 //        当你用微信给平台发送信息时就会到这里
 //        回复音乐和图文消息，我都写死了，自己可以根据自己的需要加相应的处理
         response.setContentType("text/html;charset=UTF-8");
         PrintWriter pw = response.getWriter();
         String wxMsgXml = IOUtils.toString(request.getInputStream(),"utf-8");
         RequestTextMessage textMsg = null;
         try {
                 textMsg = getRequestTextMessage(wxMsgXml);
         } catch (Exception e) {
                 e.printStackTrace();
         }
         StringBuffer replyMsg = new StringBuffer();
         String receive = textMsg.getContent().trim();
         String returnXml = null;

         if (textMsg != null&&!receive.equals("")) {
             if (receive.equals("？")||receive.equals("?")) {

                 replyMsg.append("欢迎使用微信平台！");
                 replyMsg.append("\r\n1、当前时间");
                 replyMsg.append("\r\n2、听音乐");
                 replyMsg.append("\r\n3、看图文");
                 replyMsg.append("\r\n其他、回音壁请直接输入文字信息");

                 returnXml = getReplyTextMessage(replyMsg.toString(), textMsg.getFromUserName(),textMsg.getToUserName());

             } else  if (receive.equals("2")) {

             //回复音乐信息
             returnXml = getReplyMusicMessage(textMsg.getFromUserName(),textMsg.getToUserName());

         } else  if (receive.equals("3")) {

             //回复图文
             returnXml = getReplyTuwenMessage(textMsg.getFromUserName(),textMsg.getToUserName());

         }  else if (receive.equals("1")) {

             //回复时间
             SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 

             replyMsg.append("当前时间\r\n"+df.format(new Date()));
             returnXml = getReplyTextMessage(replyMsg.toString(), textMsg.getFromUserName(),textMsg.getToUserName());

         } else {

             replyMsg.append("收到： " + textMsg.getContent());
             returnXml = getReplyTextMessage(replyMsg.toString(), textMsg.getFromUserName(),textMsg.getToUserName());

         }
         } else {

             replyMsg.append("别闹了，这谁看得懂啊！");
             returnXml = getReplyTextMessage(replyMsg.toString(), textMsg.getFromUserName(),textMsg.getToUserName());

         }
         pw.println(returnXml);
     }

 //         获取推送文本消息
     private RequestTextMessage getRequestTextMessage(String xml){

             XStream xstream = new XStream(new DomDriver());

             xstream.alias("xml", RequestTextMessage.class);
             xstream.aliasField("ToUserName", RequestTextMessage.class, "toUserName");
             xstream.aliasField("FromUserName", RequestTextMessage.class, "fromUserName");
             xstream.aliasField("CreateTime", RequestTextMessage.class, "createTime");
             xstream.aliasField("MsgType", RequestTextMessage.class, "messageType");
             xstream.aliasField("Content", RequestTextMessage.class, "content");
             xstream.aliasField("MsgId", RequestTextMessage.class, "msgId");

             RequestTextMessage requestTextMessage = (RequestTextMessage)xstream.fromXML(xml);
             return requestTextMessage;
     }
 //    回复文本消息
     private String getReplyTextMessage(String content, String fromUserName,String toUserName){

         ReplyTextMessage we = new ReplyTextMessage();
         we.setMessageType("text");
         we.setFuncFlag("0");
         we.setCreateTime(new Long(new Date().getTime()).toString());
         we.setContent(content);
         we.setToUserName(fromUserName);
         we.setFromUserName(toUserName);
         XStream xstream = new XStream(new DomDriver());
         xstream.alias("xml", ReplyTextMessage.class);
         xstream.aliasField("ToUserName", ReplyTextMessage.class, "toUserName");
         xstream.aliasField("FromUserName", ReplyTextMessage.class, "fromUserName");
         xstream.aliasField("CreateTime", ReplyTextMessage.class, "createTime");
         xstream.aliasField("MsgType", ReplyTextMessage.class, "messageType");
         xstream.aliasField("Content", ReplyTextMessage.class, "content");
         xstream.aliasField("FuncFlag", ReplyTextMessage.class, "funcFlag");
         String xml =xstream.toXML(we);
         return xml;
     }
 //    回复音乐消息
     private String getReplyMusicMessage(String fromUserName,String toUserName){

             ReplyMusicMessage we = new ReplyMusicMessage();
             Music music = new Music();

             we.setMessageType("music");
             we.setCreateTime(new Long(new Date().getTime()).toString());
             we.setToUserName(fromUserName);
             we.setFromUserName(toUserName);
             we.setFuncFlag("0");

             music.setTitle("回家|X-man");
             music.setDescription("萨克斯 回家  勾起你想家的愁思...");

             String url = "http://bcs.duapp.com/yishi-music/%E5%9B%9E%E5%AE%B6.mp3?sign=MBO:97068c69ccb2ab230a497c59d528dcce:LdYZ%2FLXohKa6YCy9gbxL%2B1mZ4Co%3D";
             String url2 = "http://bcs.duapp.com/yishi-music/X-man.mp3?sign=MBO:97068c69ccb2ab230a497c59d528dcce:cYV%2B%2Fq2Tlv2de6gqecZynCyIm3k%3D";
             music.setMusicUrl(url);
             music.setHqMusicUrl(url2);

             we.setMusic(music);

             XStream xstream = new XStream(new DomDriver());
             xstream.alias("xml", ReplyMusicMessage.class);
             xstream.aliasField("ToUserName", ReplyMusicMessage.class, "toUserName");
             xstream.aliasField("FromUserName", ReplyMusicMessage.class, "fromUserName");
             xstream.aliasField("CreateTime", ReplyMusicMessage.class, "createTime");
             xstream.aliasField("MsgType", ReplyMusicMessage.class, "messageType");
             xstream.aliasField("FuncFlag", ReplyMusicMessage.class, "funcFlag");
             xstream.aliasField("Music", ReplyMusicMessage.class, "Music");

             xstream.aliasField("Title", Music.class, "title");
             xstream.aliasField("Description", Music.class, "description");
             xstream.aliasField("MusicUrl", Music.class, "musicUrl");
             xstream.aliasField("HQMusicUrl", Music.class, "hqMusicUrl");

             String xml =xstream.toXML(we);
             return xml;
     }

 //    回复图文消息
     private String getReplyTuwenMessage(String fromUserName,String toUserName){

         ReplyTuwenMessage we = new ReplyTuwenMessage();

         Articles articles = new Articles();

         Item item = new Item();

         we.setMessageType("news");
         we.setCreateTime(new Long(new Date().getTime()).toString());
         we.setToUserName(fromUserName);
         we.setFromUserName(toUserName);
         we.setFuncFlag("0");
         we.setArticleCount(1);

         item.setTitle("俊介");
         item.setDescription("俊介（SHUNSUKE）是Twitter上现在最流行的偶像犬，是哈多利系博美犬（即俗称英系博美），因为在网上卖萌而走红网络。");
         item.setPicUrl("http://bcs.duapp.com/yishi-music/111.jpg?sign=MBO:97068c69ccb2ab230a497c59d528dcce:hmzcBYxgI4yUaTd9GvahO1GvE%2BA%3D");
         item.setUrl("http://baike.baidu.com/view/6300265.htm");        

         articles.setItem(item);
         we.setArticles(articles);

         XStream xstream = new XStream(new DomDriver());
         xstream.alias("xml", ReplyTuwenMessage.class);
         xstream.aliasField("ToUserName", ReplyTuwenMessage.class, "toUserName");
         xstream.aliasField("FromUserName", ReplyTuwenMessage.class, "fromUserName");
         xstream.aliasField("CreateTime", ReplyTuwenMessage.class, "createTime");
         xstream.aliasField("MsgType", ReplyTuwenMessage.class, "messageType");
         xstream.aliasField("Articles", ReplyTuwenMessage.class, "Articles");

         xstream.aliasField("ArticleCount", ReplyTuwenMessage.class, "articleCount");
         xstream.aliasField("FuncFlag", ReplyTuwenMessage.class, "funcFlag");

         xstream.aliasField("item", Articles.class, "item");

         xstream.aliasField("Title", Item.class, "title");
         xstream.aliasField("Description", Item.class, "description");
         xstream.aliasField("PicUrl", Item.class, "picUrl");
         xstream.aliasField("Url", Item.class, "url");

         String xml =xstream.toXML(we);
         return xml;
     }

 }

WbChat

 public class ReplyMusicMessage {

     private String toUserName;
     private String fromUserName;
     private String createTime;
     private String messageType;
     private Music Music;
     private String funcFlag;
 //这里的funcFlag，微信平台接口文档里没有，但是必须写上，不然会收不到返回的信息
 //getters、setters
 }

ReplyMusicMessage

 public class ReplyTextMessage {

         private String toUserName;
         private String fromUserName;
         private String createTime;
         private String messageType;
         private String content;
         private String funcFlag;
 // getters,setters
 }

ReplyTextMessage

 public class ReplyTuwenMessage {

     private String toUserName;
     private String fromUserName;
     private String createTime;
     private String messageType;
     private int articleCount;

     private Articles Articles;
     private String funcFlag;
 //getters,setters
 }

ReplyTuwenMessage

 public class RequestTextMessage {
     private String toUserName;
     private String fromUserName;
     private String createTime;
     private String messageType;
     private String content;
     private String msgId;
 //getters,setters
 }

RequestTextMessage

 public class Articles {

     private Item item;

     public Item getItem() {
         return item;
     }

     public void setItem(Item item) {
         this.item = item;
     }

 }

Articles

 public class Item {

     private String title;
     private String description;
     private String picUrl;
     private String url;
 //getters,setters
 }

Item

 public class Music {

     private String title;
     private String description;
     private String musicUrl;
     private String hqMusicUrl;
 //getters,setters
 }

Music

 <servlet>
     <servlet-name>Test</servlet-name>
     <servlet-class>com.main.WbChat</servlet-class>
   </servlet>
   <servlet-mapping>
     <servlet-name>Test</servlet-name>
     <url-pattern>/wbchat</url-pattern>
   </servlet-mapping>

web.xml配置

还要加四个jar包：

利用MyEclipse直接把工程打为war包，上传到百度开发者中心，并上线该应用。

4、成为开发者，开启开发模式。

将百度开发者中心中的当前域名+/wbchat 添加到微信平台的URL处，Token可以随便填（因为我没有判断Token）。

5、大功告成，可以在微信上添加该公众账号聊天了。

小提示：

1、调试时，微信发送消息却没有受到信息，可以去看看百度开发者中心，在应用版本管理中找到该应用，然后点击高级下的日志，查看日志来看出什么问题了

2、下载jar包地址：http://jarfiles.pandaidea.com/

3、不要听百度开发者中心说的那个”如何提交代码“，它是使用svn，它给的下载svn地址下的是svn1.8的，根本就checkout不了工程，如果想使用svn的话，就得去下载svn1.6的版本来使用。我是使用上传更新war包来更新工程的，这样在自己的MyEclipse中直接编写。