在spring3.2.0+hibernate3.3.2+struts2 2.2.3中使用websocket，运行环境是tomcat8.0.36，获取HttpSession

直接看如何获取HttpSession对象。

首先必须得写一个继承javax.websocket.server.ServerEndpointConfig.Configurator类的类来获取HttpSession:import javax.servlet.http.HttpSession;import javax.websocket.HandshakeResponse;import javax.websocket.server.HandshakeRequest;import javax.websocket.server.ServerEndpointConfig;import javax.websocket.server.ServerEndpointConfig.Configurator;public class GetHttpSessionConfigurator extends Configurator{@Overridepublic void modifyHandshake(ServerEndpointConfig sec, HandshakeRequest request, HandshakeResponse response) {// TODO Auto-generated method stubHttpSession httpSession=(HttpSession) request.getHttpSession();        sec.getUserProperties().put(HttpSession.class.getName(),httpSession);}}

接着在websocket服务器类中：

注意由于使用了struts2，所以所有的请求都会被拦截，需要在strus.xml加上：<constant name="struts.action.excludePattern" value="/chat/server"></constant>

就可以放过该请求。

import java.sql.SQLException;import javax.servlet.http.HttpSession;import javax.websocket.EndpointConfig;import javax.websocket.OnClose;import javax.websocket.OnMessage;import javax.websocket.OnOpen;import javax.websocket.Session;import javax.websocket.server.ServerEndpoint;import org.hibernate.HibernateException;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.orm.hibernate3.HibernateCallback;import org.springframework.orm.hibernate3.HibernateTemplate;import com.chuangyejia.bean.User;import com.chuangyejia.websockettoolkit.GetHttpSessionConfigurator;import com.google.gson.Gson;import com.google.gson.JsonObject;@ServerEndpoint(value = "/chat/server",configurator=GetHttpSessionConfigurator.class)public class ChatServer  {@SuppressWarnings({ "resource", "unchecked", "rawtypes" })@OnMessage // 接受客户端消息public void onMessage(String msg, Session session) throws Exception {Gson gson = new Gson();JsonObject jo = new JsonObject();ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");HibernateTemplate hibernateTemplate = ac.getBean("hibernateTemplate", HibernateTemplate.class);final User user = new User();boolean rightToUser = (boolean)hibernateTemplate.execute(new HibernateCallback() {@Overridepublic Object doInHibernate(org.hibernate.Session session) throws HibernateException, SQLException {Object[] s = (Object[]) session.createQuery("select u.userId,u.userNickName,u.userPhoto from User u where u.userId = '402881fc56416d860156416e52330001'").list().get(0);if(s != null) {user.setUserId(s[0].toString());user.setUserNickName(s[1].toString());user.setUserPhoto(s[2].toString());return true;} elsereturn false;}});if(rightToUser) {}jo.add("toUser", gson.toJsonTree(user));System.out.println("msg : " + msg.toString());session.getBasicRemote().sendText(jo.toString()); // 发送信息到客户端if(msg.equals("close")) {session.getBasicRemote().sendText("bye bye!"); // 发送信息到客户端session.close(); // 关闭连接点}}@OnOpen // 成功连接时执行此代码public void onOpen(EndpointConfig config) {HttpSession httpSession= (HttpSession) config.getUserProperties().get(HttpSession.class.getName());User fromUser = (User)httpSession.getAttribute("user");System.out.println(fromUser.getUserNickName());}@OnClose // 连接关闭时执行public void onClose() {}}注意在OnOpen中执行的代码！就那里获取HttpSession对象！

看看前台的js代码部分：

<pre name="code" class="javascript"><script type="text/javascript">

var obj = {"toUser":"true","toUserId": "<s:property value='#parameters.toUserId'/>"};var webSocket = null;init();function init() { if ('WebSocket' in window) { webSocket = new WebSocket('ws://localhost:8080/ChuangYeJia/chat/server'); //建立连接点 } else if ('MozWebSocket' in window) { webSocket = new MozWebSocket('ws://localhost:8080/ChuangYeJia/chat/server'); }webSocket.onerror = function(event) {onError(event);};webSocket.onopen = function(event) {onOpen(event);};webSocket.onmessage = function(event) //接受客户端消息{onMessage(event);};}function onMessage(event) {var js = JSON.parse(event.data);$(".my_message").text(js.toUser.userNickName);}function onOpen(event) {webSocket.send(JSON.stringify(obj)); //发送消息给服务器端}function onError(event) {alert(event.data);}$("#send_message").on('click', function() {webSocket.send($("#message_input").val()); //发送消息给服务器端});});</script>

就这样。