WebSocket系列之的网页端即时通讯实现

本博客介绍基于html5的Websocket网页即时通讯技术，前端开发采用ExtJS前端框架
JavaEE框架：Mybatis、SpringMVC
先去官网下载ExtJS框架的资料文件：
https://www.sencha.com/products/extjs/evaluate/
可以参考中文翻译过来的官网查看API：
http://extjs-doc-cn.github.io/ext4api/
下载集成的jar：

websocket.css:

@CHARSET "UTF-8";
.l-im-message-warn {
	font-family: "微软雅黑";
	cursor: default;
	width: 100%;
	padding: 5px 0px 5px 25px;
	-webkit-user-select : none;
	background: url("../images/information.png") no-repeat 5;
}

.l-im-message {
	font-family: "微软雅黑";
	cursor: default;
	width: 100%;
}

.l-im-message-over {
	background-color: rgba(233, 233, 233, 0.5);
}

.l-im-message-selected {
	background-color: rgba(250, 218, 90, 0.5);
}

.l-im-message-header {
	font-size: 12px;
	padding: 5px 0px 5px 10px;
}

.l-im-message-header-self {
	color: green;
}
.l-im-message-header-remote {
	color: blue;
}

.l-im-message-body {
	font-size: 12px;
	padding: 2px 0px 2px 20px;
}

.user-win {
	background-image: url( ../images/user_win.png )
		!important;
}

.user-online {
	background-image: url( ../images/group.png )
		!important;
}

.user {
	background-image: url( ../images/user.gif )
		!important;
}

websocket.js:

var websocket;
var isCreatw = false;
var title="";
var win;
var input;
var isQj = true;
var toUser="";
function toUserMsg(toU){
	if((!isQj && toUser == toU) || toU == user){
		win.setTitle(title + "  (已连接)   【现在全局对话】");
		isQj = true;
		toUser = "";
	}else{
		win.setTitle(title + "  (已连接)   【现在单独与"+toU+"对话】");
		isQj = false;
		toUser = toU;
	}
}
 function creatw() {
	 		if(isCreatw){
	 			alert("已经启动");
	 			return;
	 		}else{
	 			isCreatw = true;
	 		}
			//创建用户输入框
			input = Ext.create('Ext.form.field.HtmlEditor', {
						region : 'south',
						height : 120,
						enableFont : false,
						enableSourceEdit : false,
						enableAlignments : false,
						listeners : {
							initialize : function() {
								Ext.EventManager.on(me.input.getDoc(), {
											keyup : function(e) {
												if (e.ctrlKey === true
														&& e.keyCode == 13) {
													e.preventDefault();
													e.stopPropagation();
													send();
												}
											}
										});
							}
						}
					});
			
			//创建消息展示容器
			var output = Ext.create('MessageContainer', {
						region : 'center'
					});

			var dialog = Ext.create('Ext.panel.Panel', {
						region : 'center',
						layout : 'border',
						items : [input, output],
						buttons : [{
									text : '发送',
									handler : send
								}]
					});

			//初始话WebSocket
			function initWebSocket() {
				if (window.WebSocket) {
					websocket = new WebSocket(encodeURI('ws://'+wimadress));
					
					websocket.onopen = function() {
						//连接成功
						win.setTitle(title + '  (已连接)   【现在全局对话】');
						websocket.send('admin'+user);
					}
					websocket.onerror = function() {
						//连接失败
						win.setTitle(title + '  (连接发生错误)');
					}
					websocket.onclose = function() {
						//连接断开
						win.setTitle(title + '  (已经断开连接)');
					}
					//消息接收
					websocket.onmessage = function(message) {
						var message = JSON.parse(message.data);
						//接收用户发送的消息
						if (message.type == 'message') {
							output.receive(message);
						} else if (message.type == 'get_online_user') {
							//获取在线用户列表
							var root = onlineUser.getRootNode();
							Ext.each(message.list,function(user){
								var node = root.createNode({
									id : user,
									text : user,
									iconCls : 'user',
									leaf : true
								});
								root.appendChild(node);
							});
						} else if (message.type == 'user_join') {
							//用户上线
								var root = onlineUser.getRootNode();
								var user = message.user;
								var node = root.createNode({
									id : user,
									text : user,
									iconCls : 'user',
									leaf : true
								});
								root.appendChild(node);
						} else if (message.type == 'user_leave') {
								//用户下线
								var root = onlineUser.getRootNode();
								var user = message.user;
								var node = root.findChild('id',user);
								root.removeChild(node);
						}
					}
				}
			};

			//在线用户树
			var onlineUser = Ext.create('Ext.tree.Panel', {
						title : '在线用户',
						rootVisible : false,
						region : 'east',
						width : 150,
						lines : false,
						useArrows : true,
						autoScroll : true,
						split : true,
						iconCls : 'user-online',
						store : Ext.create('Ext.data.TreeStore', {
									root : {
										text : '在线用户',
										expanded : true,
										children : []
									}
								})
					});
			
			title = '欢迎您：' + user;
			//展示窗口
			win = Ext.create('Ext.window.Window', {
						title : title + '  (未连接)',
						layout : 'border',
						iconCls : 'user-win',
						minWidth : 650,
						minHeight : 460,
						width : 650,
						animateTarget : 'websocket_button',
						height : 460,
						items : [dialog,onlineUser],
						border : false,
						listeners : {
							render : function() {
								initWebSocket();
							}
						}
					});

			win.show();
			
			win.on("close",function(){
				websocket.send('LeaveAdmin');
				isCreatw = false;
			 });

			//发送消息
			function send() {
				var content = input.getValue();
				if(toUser != ""){content = "admin886"+toUser+"admin888" + content;}
				var message = {};
				if (websocket != null) {
					if (input.getValue()) {
						Ext.apply(message, {
									from : user,
									content : content,
									timestamp : new Date().getTime(),
									type : 'message'
								});
						websocket.send(JSON.stringify(message));
						//output.receive(message);
						input.setValue('');
					}
				} else {
					Ext.Msg.alert('提示', '您已经掉线，无法发送消息!');
				}
			}
};

//用于展示用户的聊天信息
Ext.define('MessageContainer', {

	extend : 'Ext.view.View',

	trackOver : true,

	multiSelect : false,

	itemCls : 'l-im-message',

	itemSelector : 'div.l-im-message',

	overItemCls : 'l-im-message-over',

	selectedItemCls : 'l-im-message-selected',

	style : {
		overflow : 'auto',
		backgroundColor : '#fff'
	},

	tpl : [
			'
​欢迎使用即时通讯系统。
',
			'',
			'
',
			'
{from}  {timestamp}
',
			'
{content}
', '
',
			''],

	messages : [],

	initComponent : function() {
		var me = this;
		me.messageModel = Ext.define('Leetop.im.MessageModel', {
					extend : 'Ext.data.Model',
					fields : ['from', 'timestamp', 'content', 'source']
				});
		me.store = Ext.create('Ext.data.Store', {
					model : 'Leetop.im.MessageModel',
					data : me.messages
				});
		me.callParent();
	},

	//将服务器推送的信息展示到页面中
	receive : function(message) {
		var me = this;
		message['timestamp'] = Ext.Date.format(new Date(message['timestamp']),
				'H:i:s');
		if(message.from == user){
			message.source = 'self';
		}else{
			message.source = 'remote';
		}
		me.store.add(message);
		if (me.el.dom) {
			me.el.dom.scrollTop = me.el.dom.scrollHeight;
		}
	}
});

业务代码编写：
ChatServer.java

package com.appms.websocket;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.util.Date;

import net.sf.json.JSONObject;

import org.java_websocket.WebSocket;
import org.java_websocket.WebSocketImpl;
import org.java_websocket.framing.Framedata;
import org.java_websocket.handshake.ClientHandshake;
import org.java_websocket.server.WebSocketServer;


/**
 * 即时通讯
 */
public class ChatServer extends WebSocketServer{

	public ChatServer(int port) throws UnknownHostException {
		super(new InetSocketAddress(port));
	}

	public ChatServer(InetSocketAddress address) {
		super(address);
	}

	/**
	 * 触发连接事件
	 */
	@Override
	public void onOpen( WebSocket conn, ClientHandshake handshake ) {
	}

	/**
	 * 触发关闭事件
	 */
	@Override
	public void onClose( WebSocket conn, int code, String reason, boolean remote ) {
		userLeave(conn);
	}

	/**
	 * 客户端发送消息到服务器时触发事件
	 */
	@Override
	public void onMessage(WebSocket conn, String message){
		message = message.toString();
		if(null != message && message.startsWith("admin")){
			this.userjoin(message.replaceFirst("admin", ""),conn);
		}if(null != message && message.startsWith("LeaveAdmin")){
			this.userLeave(conn);
		}if(null != message && message.contains("admin886")){
			String toUser = message.substring(message.indexOf("admin886")+8, message.indexOf("admin888"));
			message = message.substring(0, message.indexOf("admin886")) +"[私信]  "+ message.substring(message.indexOf("admin888")+8, message.length());
			ChatServerPool.sendMessageToUser(ChatServerPool.getWebSocketByUser(toUser),message);//向所某用户发送消息
			ChatServerPool.sendMessageToUser(conn, message);//同时向本人发送消息
		}else{
			ChatServerPool.sendMessage(message.toString());//向所有在线用户发送消息
		}
	}

	public void onFragment( WebSocket conn, Framedata fragment ) {
	}

	/**
	 * 触发异常事件
	 */
	@Override
	public void onError( WebSocket conn, Exception ex ) {
		ex.printStackTrace();
		if( conn != null ) {
			//some errors like port binding failed may not be assignable to a specific websocket
		}
	}

	
	/**
	 * 用户加入处理
	 * @param user
	 */
	public void userjoin(String user, WebSocket conn){
		JSONObject result = new JSONObject();
		result.element("type", "user_join");
		result.element("user", ""+user+"");
		ChatServerPool.sendMessage(result.toString());				//把当前用户加入到所有在线用户列表中
		String joinMsg = "{\"from\":\"[系统]\",\"content\":\""+user+"上线了\",\"timestamp\":"+new Date().getTime()+",\"type\":\"message\"}";
		ChatServerPool.sendMessage(joinMsg);						//向所有在线用户推送当前用户上线的消息
		result = new JSONObject();
		result.element("type", "get_online_user");
		ChatServerPool.addUser(user,conn);							//向连接池添加当前的连接对象
		result.element("list", ChatServerPool.getOnlineUser());
		ChatServerPool.sendMessageToUser(conn, result.toString());	//向当前连接发送当前在线用户的列表
	}
	
	/**
	 * 用户下线处理
	 * @param user
	 */
	public void userLeave(WebSocket conn){
		String user = ChatServerPool.getUserByKey(conn);
		boolean b = ChatServerPool.removeUser(conn);				//在连接池中移除连接
		if(b){
			JSONObject result = new JSONObject();
			result.element("type", "user_leave");
			result.element("user", ""+user+"");
			ChatServerPool.sendMessage(result.toString());			//把当前用户从所有在线用户列表中删除
			String joinMsg = "{\"from\":\"[系统]\",\"content\":\""+user+"下线了\",\"timestamp\":"+new Date().getTime()+",\"type\":\"message\"}";
			ChatServerPool.sendMessage(joinMsg);					//向在线用户发送当前用户退出的消息
		}
	}
	public static void main( String[] args ) throws InterruptedException , IOException {
		WebSocketImpl.DEBUG = false;
		int port = 8887; //端口
		ChatServer s = new ChatServer(port);
		s.start();
		System.out.println( "服务器的端口" + s.getPort() );
	}

}

ChatServerPool.java:

package com.appms.websocket;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.java_websocket.WebSocket;

/**
 * 即时通讯
 */
public class ChatServerPool {

	private static final Map userconnections = new HashMap();
	
	/**
	 * 获取用户名
	 * @param session
	 */
	public static String getUserByKey(WebSocket conn){
		return userconnections.get(conn);
	}
	
	/**
	 * 获取WebSocket
	 * @param user
	 */
	public static WebSocket getWebSocketByUser(String user){
		Set keySet = userconnections.keySet();
		synchronized (keySet) {
			for (WebSocket conn : keySet) {
				String cuser = userconnections.get(conn);
				if(cuser.equals(user)){
					return conn;
				}
			}
		}
		return null;
	}
	
	/**
	 * 向连接池中添加连接
	 * @param inbound
	 */
	public static void addUser(String user, WebSocket conn){
		userconnections.put(conn,user);	//添加连接
	}
	
	/**
	 * 获取所有的在线用户
	 * @return
	 */
	public static Collection getOnlineUser(){
		List setUsers = new ArrayList();
		Collection setUser = userconnections.values();
		for(String u:setUser){
			setUsers.add(""+u+"");
		}
		return setUsers;
	}
	
	/**
	 * 移除连接池中的连接
	 * @param inbound
	 */
	public static boolean removeUser(WebSocket conn){
		if(userconnections.containsKey(conn)){
			userconnections.remove(conn);	//移除连接
			return true;
		}else{
			return false;
		}
	}
	
	/**
	 * 向特定的用户发送数据
	 * @param user
	 * @param message
	 */
	public static void sendMessageToUser(WebSocket conn,String message){
		if(null != conn && null != userconnections.get(conn)){
			conn.send(message);
		}
	}
	
	/**
	 * 向所有的用户发送消息
	 * @param message
	 */
	public static void sendMessage(String message){
		Set keySet = userconnections.keySet();
		synchronized (keySet) {
			for (WebSocket conn : keySet) {
				String user = userconnections.get(conn);
				if(user != null){
					conn.send(message);
				}
			}
		}
	}
}

写个过滤器，在项目执行时启动：

package com.appms.filter;

import java.io.IOException;
import java.net.UnknownHostException;
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.java_websocket.WebSocketImpl;

import com.appms.base.BaseController;
import com.appms.base.Const;
import com.appms.utils.Tools;
import com.appms.websocket.ChatServer;
import com.appms.websocket.OnlineChatServer;

public class StartFilter extends BaseController implements Filter{

	/**
	 * 初始化
	 */
	public void init(FilterConfig fc) throws ServletException {
		this.startWebsocketInstantMsg();
		this.startWebsocketOnline();
	}
	
	/**
	 * 启动即时聊天服务
	 */
	public void startWebsocketInstantMsg(){
		WebSocketImpl.DEBUG = false;
		ChatServer s = null;
		try {
			String strWEBSOCKET = Tools.readTxtFile(Const.WEBSOCKET);//读取WEBSOCKET配置,获取端口配置
			if(null != strWEBSOCKET && !"".equals(strWEBSOCKET)){
				String strIW[] = strWEBSOCKET.split(",fh,");
				if(strIW.length == 4){
					s = new ChatServer(Integer.parseInt(strIW[1]));
					s.start();
				}
			}
			System.out.println( "websocket服务器启动,端口" + s.getPort() );
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 启动在线管理服务
	 */
	public void startWebsocketOnline(){
		WebSocketImpl.DEBUG = false;
		OnlineChatServer s = null;
		try {
			String strWEBSOCKET = Tools.readTxtFile(Const.WEBSOCKET);//读取WEBSOCKET配置,获取端口配置
			if(null != strWEBSOCKET && !"".equals(strWEBSOCKET)){
				String strIW[] = strWEBSOCKET.split(",fh,");
				if(strIW.length == 4){
					s = new OnlineChatServer(Integer.parseInt(strIW[3]));
					s.start();
				}
			}
			System.out.println( "websocket服务器启动,端口" + s.getPort() );
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
	}
	
	
	//计时器
	public void timer() {
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.HOUR_OF_DAY, 9); // 控制时
		calendar.set(Calendar.MINUTE, 0); 		// 控制分
		calendar.set(Calendar.SECOND, 0); 		// 控制秒

		Date time = calendar.getTime(); 		// 得出执行任务的时间

		Timer timer = new Timer();
		timer.scheduleAtFixedRate(new TimerTask() {
			public void run() {
				//PersonService personService = (PersonService)ApplicationContext.getBean("personService");
			}
		}, time, 1000*60*60*24);// 这里设定将延时每天固定执行
	}


	public void destroy() {
		// TODO Auto-generated method stub
		
	}


	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		// TODO Auto-generated method stub
		
	}
	
}

在web.xml里配置：

 
    startFilter
    com.appms.filter.StartFilter
  

在jsp页面进行调用：

点击li标签跳出聊天页面

ul class="am-avg-sm-1 am-avg-md-4 am-margin am-padding am-text-center admin-content-list ">
      

即时通讯

      

图表统计

      

昨日访问
80082
      

在线用户
3000
    

私聊：

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基于ExtJS前端框架的Websocket即时通讯系统