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用户在手机端向公众账号发送一条消息，并收到回复的消息，这个动作的处理过程是怎样的?
接收消息：用户向公众账号发送消息，此时微信服务器接收到消息，并将消息的xml数据包发送到开发者填写的接口配置URL上；
发送消息：对于每一个POST请求，开发者在响应包(Get)中返回特定XML结构，对该消息进行响应(现支持回复文本、图片、图文、语音、视频、音乐)。
交互流程：
（1）用户通过微信客户端向公众账号发送消息，消息首先会被微信服务器接收到；
（2）微信服务器接收到消息后，会根据开发者在接口配置信息中填写的URL，将信息通过HTTP POST方式传递到公众账号服务器；
（3）公众账号服务器接收到消息后，会按照业务逻辑进行相应的处理；
（4）处理完成后，公众账号服务器会将处理结果返回给微信服务器；
（5）微信服务器将公众账号服务器返回的消息通过公众账号发送给用户；
注：在真个消息交互过程中，公众账号服务器需要做：（1）接收微信服务器器发送来的消息；（2）根据指定的业务逻辑对消息进行处理；（3）将处理结果返回给微信服务器。
微信服务器与公众账号服务器交互的消息分2类：
（1）接收消息：指用户发送给公众账号的消息
a:接收普通消息：有6种类型：文本消息、图片消息、语音消息、视频消息、地理位置消息、链接消息；
b:接收事件推送：
（2）事件：指用户对公众账号做出某种操作时，微信服务器会将对应的事件推送给公众账号服务器。有6种类型：关注/取消关注事件、扫描带参数二维码事件、上报地理位置事件、自定义菜单事件、点击菜单拉取消息时的事件推送、点击菜单跳转链接时的事件推送；
（3）发送消息：指公众账号回复给用户的消息。有6种类型：文本消息、图片消息、语音消息、视频消息、音乐消息、图文消息；
package org.liufeng.course.service;
import javax.servlet.http.HttpServlet;
/**
* 请求处理的核心类
*
* @author liufeng
* @date 2013-09-29
*/
public class CoreServlet extends HttpServlet {
/**
* 请求校验与处理
*/
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
/*********************企业号。。。。Start。。。。*********************************************************************************/
// 将请求、响应的编码均设置为UTF-8（防止中文乱码）
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
// 微信加密签名
String msg_signature =request.getParameter("msg_signature");
// 时间戳
String timestamp =request.getParameter("timestamp");
// 随机数
String nonce =request.getParameter("nonce");
//从请求中读取整个post数据
InputStream inputStream =request.getInputStream();
String postData =IOUtils.toString(inputStream, "UTF-8");
System.out.println(postData);
String msg = "";
WXBizMsgCrypt wxcpt = null;
try {
wxcpt = new WXBizMsgCrypt(sToken ,sEncodingAESKey , sCorpID );
//解密消息
msg =wxcpt.DecryptMsg(msg_signature, timestamp, nonce, postData);
} catch (AesException e) {
e.printStackTrace();
}
System.out.println("msg=" +msg);
//调用核心服务类接收处理请求
String respXml = CoreService.processRequest(msg);//调用核心业务类
// 响应消息
PrintWriter out = response.getWriter();
out.print(encryptMsg);
out.close();
}
}
public class CoreService {
<span style="white-space:pre"> </span>/**
<span style="white-space:pre"> </span> *处理微信发来的请求——企业号 韩学敏
<span style="white-space:pre"> </span> *
<span style="white-space:pre"> </span> * @param request
<span style="white-space:pre"> </span> * @return xml
<span style="white-space:pre"> </span> */
<span style="white-space:pre"> </span>public static String processRequest(String msg) {
<span style="white-space:pre"> </span>//xml格式的消息数据
<span style="white-space:pre"> </span>StringrespXml = null;
<span style="white-space:pre"> </span>//默认返回的文本消息内容
<span style="white-space:pre"> </span>String respContent = "";
<span style="white-space:pre"> </span>try{
<span style="white-space:pre"> </span>// 调用parseXml方法解析请求消息
<span style="white-space:pre"> </span>Map<String,String> requestMap = MessageUtil.parseXml(msg);
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>// 发送方帐号
<span style="white-space:pre"> </span>String fromUserId = requestMap.get("FromUserName");
<span style="white-space:pre"> </span>// 公众帐号
<span style="white-space:pre"> </span>String toUserName = requestMap.get("ToUserName");
<span style="white-space:pre"> </span>// 消息类型
<span style="white-space:pre"> </span>String msgType = requestMap.get("MsgType");
<span style="white-space:pre"> </span>//获取企业应用Id
<span style="white-space:pre"> </span>String agentId = requestMap.get("AgentID");
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>// 获取接口访问凭证
<span style="white-space:pre"> </span>String accessToken =CommonUtil.getAccessToken(toUserName, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx").getAccessToken();
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>// 回复文本消息
<span style="white-space:pre"> </span>TextMessagetextMessage = new TextMessage();
<span style="white-space:pre"> </span>textMessage.setToUserName(fromUserName);
<span style="white-space:pre"> </span>textMessage.setFromUserName(toUserName);
<span style="white-space:pre"> </span>textMessage.setCreateTime(newDate().getTime());
<span style="white-space:pre"> </span>textMessage.setMsgType(MessageUtil.RESP_MESSAGE_TYPE_TEXT);
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span> //判断消息类型
<span style="white-space:pre"> </span>if(msgType.equals(MessageUtil.REQ_MESSAGE_TYPE_TEXT)) {// 文本消息
<span style="white-space:pre"> </span> respContent = "您发送的是文本消息";
<span style="white-space:pre"> </span>}elseif(msgType.equals(MessageUtil.REQ_MESSAGE_TYPE_IMAGE)){//图片
<span style="white-space:pre"> </span> respContent = "您发送的是文本图片消息";
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>}else if(msgType.equals(MessageUtil.REQ_MESSAGE_TYPE_VOICE)){//语音
<span style="white-space:pre"> </span> respContent = "您发送的是语音消息";
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>}else if(msgType.equals(MessageUtil.REQ_MESSAGE_TYPE_LOCATION)){//地理位置
<span style="white-space:pre"> </span> respContent ="您发送的是地理位置消息";
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>}else if(msgType.equals(MessageUtil.REQ_MESSAGE_TYPE_EVENT)){//事件推送
<span style="white-space:pre"> </span> respContent = "您发送的是事件推送消息";
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>}else if(msgType.equals(MessageUtil.REQ_MESSAGE_TYPE_VIDEO)){//视频
<span style="white-space:pre"> </span> respContent ="您发送的是视频消息";
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>}else if(msgType.equals(MessageUtil.REQ_MESSAGE_TYPE_LINK)){//链接
<span style="white-space:pre"> </span> respContent = "您发送的是链接消息";
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>textMessage.setContent(respContent);
<span style="white-space:pre"> </span>// 将文本消息对象转换成xml
<span style="white-space:pre"> </span>respXml= MessageUtil.messageToXml(textMessage);
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>}catch (Exception e) {
<span style="white-space:pre"> </span>e.printStackTrace();
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>returnrespXml ;
<span style="white-space:pre"> </span>}
}
/**
* 通用工具类
*/
public class CommonUtil {
<span style="white-space:pre"> </span>private static Logger log = LoggerFactory.getLogger(CommonUtil.class);
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span> //获取AccessToken的Http请求 韩学敏 2015-2-25 10:58:36
<span style="white-space:pre"> </span>public final static Stringaccesstoken_url="https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid =CORPID&corpsecret=CORPSECRET";
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>/**
<span style="white-space:pre"> </span> *获取接口访问凭证 企业号 ——韩学敏 2015-2-25 10:59:57
<span style="white-space:pre"> </span> *
<span style="white-space:pre"> </span> *@param corpid 企业Id
<span style="white-space:pre"> </span> *@param corpsecret 凭证密钥
<span style="white-space:pre"> </span> * @return
<span style="white-space:pre"> </span> */
<span style="white-space:pre"> </span>public static Token getAccessToken(String corpid, String corpsecret) {
<span style="white-space:pre"> </span>Token token = null;
<span style="white-space:pre"> </span>String requestUrl = accesstoken_url.replace("CORPID",corpid).replace("CORPSECRET", corpsecret);
<span style="white-space:pre"> </span>// 发起GET请求获取凭证
<span style="white-space:pre"> </span>JSONObject jsonObject = httpsRequest(requestUrl, "GET", null);
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>if(null != jsonObject) {
<span style="white-space:pre"> </span>try{
<span style="white-space:pre"> </span>token= new Token();
<span style="white-space:pre"> </span>token.setAccessToken(jsonObject.getString("access_token"));
<span style="white-space:pre"> </span>token.setExpiresIn(jsonObject.getInt("expires_in"));
<span style="white-space:pre"> </span>}catch (JSONException e) {
<span style="white-space:pre"> </span>token= null;
<span style="white-space:pre"> </span>// 获取token失败
<span style="white-space:pre"> </span>log.error("获取token失败 errcode:{} errmsg:{}",jsonObject.getInt("errcode"),jsonObject.getString("errmsg"));
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>returntoken;
<span style="white-space:pre"> </span>}
}
/**
* 消息处理工具类
*/
public classMessageUtil {
<span style="white-space:pre"> </span>// 请求消息类型：文本
<span style="white-space:pre"> </span>public static final String REQ_MESSAGE_TYPE_TEXT = "text";
<span style="white-space:pre"> </span>// 请求消息类型：图片
<span style="white-space:pre"> </span>public static final String REQ_MESSAGE_TYPE_IMAGE = "image";
<span style="white-space:pre"> </span>// 请求消息类型：语音
<span style="white-space:pre"> </span>public static final String REQ_MESSAGE_TYPE_VOICE = "voice";
<span style="white-space:pre"> </span>// 请求消息类型：视频
<span style="white-space:pre"> </span>public static final String REQ_MESSAGE_TYPE_VIDEO = "video";
<span style="white-space:pre"> </span>// 请求消息类型：地理位置
<span style="white-space:pre"> </span>public static final String REQ_MESSAGE_TYPE_LOCATION = "location";
<span style="white-space:pre"> </span>// 请求消息类型：链接
<span style="white-space:pre"> </span>public static final String REQ_MESSAGE_TYPE_LINK = "link";
<span style="white-space:pre"> </span>// 请求消息类型：事件推送
<span style="white-space:pre"> </span>public static final String REQ_MESSAGE_TYPE_EVENT = "event";
<span style="white-space:pre"> </span>// 事件类型：subscribe(订阅)
<span style="white-space:pre"> </span>public static final String EVENT_TYPE_SUBSCRIBE = "subscribe";
<span style="white-space:pre"> </span>// 事件类型：unsubscribe(取消订阅)
<span style="white-space:pre"> </span>public static final String EVENT_TYPE_UNSUBSCRIBE = "unsubscribe";
<span style="white-space:pre"> </span>// 事件类型：scan(用户已关注时的扫描带参数二维码)
<span style="white-space:pre"> </span>public static final String EVENT_TYPE_SCAN = "scan";
<span style="white-space:pre"> </span>// 事件类型：LOCATION(上报地理位置)
<span style="white-space:pre"> </span>public static final String EVENT_TYPE_LOCATION = "LOCATION";
<span style="white-space:pre"> </span>// 事件类型：CLICK(自定义菜单)
<span style="white-space:pre"> </span>public static final String EVENT_TYPE_CLICK = "CLICK";
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>// 响应消息类型：文本
<span style="white-space:pre"> </span>public static final String RESP_MESSAGE_TYPE_TEXT = "text";
<span style="white-space:pre"> </span>// 响应消息类型：图片
<span style="white-space:pre"> </span>public static final String RESP_MESSAGE_TYPE_IMAGE = "image";
<span style="white-space:pre"> </span>// 响应消息类型：语音
<span style="white-space:pre"> </span>public static final String RESP_MESSAGE_TYPE_VOICE = "voice";
<span style="white-space:pre"> </span>// 响应消息类型：视频
<span style="white-space:pre"> </span>public static final String RESP_MESSAGE_TYPE_VIDEO = "video";
<span style="white-space:pre"> </span>// 响应消息类型：音乐
<span style="white-space:pre"> </span>public static final String RESP_MESSAGE_TYPE_MUSIC = "music";
<span style="white-space:pre"> </span>// 响应消息类型：图文
<span style="white-space:pre"> </span>public static final String RESP_MESSAGE_TYPE_NEWS = "news";
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>/**
<span style="white-space:pre"> </span> * 扩展xstream使其支持CDATA
<span style="white-space:pre"> </span> */
<span style="white-space:pre"> </span>private static XStream xstream = new XStream(new XppDriver() {
<span style="white-space:pre"> </span>public HierarchicalStreamWriter createWriter(Writer out) {
<span style="white-space:pre"> </span> return new PrettyPrintWriter(out) {
<span style="white-space:pre"> </span> // 对所有xml节点的转换都增加CDATA标记
<span style="white-space:pre"> </span> boolean cdata = true;
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>@SuppressWarnings("unchecked")
<span style="white-space:pre"> </span>public void startNode(String name, Class clazz) {
<span style="white-space:pre"> </span> super.startNode(name,clazz);
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>protected void writeText(QuickWriter writer, String text) {
<span style="white-space:pre"> </span>if(cdata) {
<span style="white-space:pre"> </span> writer.write("<![CDATA[");
<span style="white-space:pre"> </span> writer.write(text);
<span style="white-space:pre"> </span> writer.write("]]>");
<span style="white-space:pre"> </span>}else {
<span style="white-space:pre"> </span> writer.write(text);
<span style="white-space:pre"> </span> }
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>};
<span style="white-space:pre"> </span>}
});
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>/**
<span style="white-space:pre"> </span> *文本消息对象转换成xml
<span style="white-space:pre"> </span> *
<span style="white-space:pre"> </span> * @paramtextMessage 文本消息对象
<span style="white-space:pre"> </span> * @return xml
<span style="white-space:pre"> </span> */
<span style="white-space:pre"> </span>public static String messageToXml(TextMessage textMessage) {
<span style="white-space:pre"> </span>xstream.alias("xml",textMessage.getClass());
<span style="white-space:pre"> </span>return xstream.toXML(textMessage);
<span style="white-space:pre"> </span>}
}
/**
* 凭证 实体
*/
public class Token {
<span style="white-space:pre"> </span>// 接口访问凭证
<span style="white-space:pre"> </span>private String accessToken;
<span style="white-space:pre"> </span>// 凭证有效期，单位：秒
<span style="white-space:pre"> </span>private int expiresIn;
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>public String getAccessToken() {
<span style="white-space:pre"> </span>return accessToken;
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>public void setAccessToken(String accessToken) {
<span style="white-space:pre"> </span>this.accessToken= accessToken;
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>public int getExpiresIn() {
<span style="white-space:pre"> </span>return expiresIn;
<span style="white-space:pre"> </span>}
<span style="white-space:pre"> </span>
<span style="white-space:pre"> </span>public void setExpiresIn(int expiresIn) {
<span style="white-space:pre"> </span>this.expiresIn= expiresIn;
<span style="white-space:pre"> </span>}
}
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原文地址：http://blog.csdn.net/hanxuemin12345/article/details/43972999
