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("
1、当前时间");
                replyMsg.append("
2、听音乐");
                replyMsg.append("
3、看图文");
                replyMsg.append("
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
"+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;
    }

}

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
}

public class ReplyTextMessage {

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

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
}

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

public class Articles {

    private Item item;

    public Item getItem() {
        return item;
    }

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

public class Item {

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

public class Music {

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

<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>

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。