即时通信(RPC)的Rtmp实现--代码实现篇

实现的一般步骤是：

step 1: 定义NetConnection对象连接rtmp，并监听NetStatusEvent.NET_STATUS事件

step 2: 在NetStatusEvent.NET_STATUS事件里判断event.info.code=="NetConnection.Connect.Success"，通过SharedObject.getRomote()得到SharedObject对象

step 3: 监听SharedObject对象的SyncEvent.SYNC事件，并sharedObj.connect(netConnection)

step 4: 这个时候可以利用sharedObj.send()向服务器发送消息，然后服务器再把登录消息广播给当前连接的所有客户端

step 5: 在SyncEvent.SYNC事件里可以取到sharedObj.data里的数据了

step 6: 定义一个供服务器调用后得到返回值的函数，需要声明为public

PS：

服务器端和客户端，都是在操作SharedObject对象，客户端是读取，服务器端是写入(只有服务器执行写入才能保证数据无误)

服务器端发送消息给每个客户端，分为客户端请求和服务器端请求实现

* 客户端请求一般是调用sharedObj.send("getServerData","message")来实现

* 服务器端是调用netConnection.call("后台方法",null,"message"),然后后台方法定义通过soUser.SendMessage("getServerData", new object[]{"message"})来发送消息

服务器端代码(.net)：

using System;
using System.Collections.Generic;
using System.Text;
using FluorineFx.Messaging.Adapter;
using FluorineFx.Messaging.Api;
using FluorineFx.Messaging.Api.SO;

namespace ServiceLibrary5
{
    public class MyChatApp : ApplicationAdapter
    {
        public override bool AppConnect(IConnection connection, object[] parameters)
        {
            string name = parameters[0].ToString();
            ISharedObject soUser = this.GetSharedObject(connection.Scope, "onlineUserList");
            if (soUser == null)
            {
                this.CreateSharedObject(connection.Scope, "onlineUserList", false);
                soUser = this.GetSharedObject(connection.Scope, "onlineUserList");
            }

            soUser.SetAttribute(name, name);

           //这里是为了提供给没有parameters参数，而又需要访问连接时传过来的参数
               connection.Client.SetAttribute("currentName", name);
            return true;
        }

        public override void AppDisconnect(IConnection connection)
        {
            string name = connection.Client.GetAttribute("currentName").ToString();
            ISharedObject soUser = this.GetSharedObject(connection.Scope, "onlineUserList");
            if (soUser != null)
            {
                soUser.RemoveAttribute(name);
            }

            soUser.SendMessage("getServerData", new object[] { name + "已经断开" });

            base.AppDisconnect(connection);
        }

       //利用服务器端发送消息的通用方法，客户端需通过netConnection.call()来调用该方法
          public void sendMessage(IConnection connection, string msg)
        {
            string userName = connection.Client.GetAttribute("currentName")  as  string;

            ISharedObject soUser = GetSharedObject(connection.Scope, "onlineUserList");

            soUser.SendMessage("getServerData", new object[] { msg });
        }
    }
}

客户端代码(flex)：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" backgroundColor="0xffffff">
	<mx:List x="404" y="122" backgroundColor="#3A6EA5" width="115" height="289" id="dlOnlineUsers"></mx:List>
	<mx:Label x="420" y="92" text="当前在线用户" fontSize="13"/>
	<mx:Label x="67" y="122" text="你的昵称：" fontSize="13"/>
	<mx:TextInput id="txtName" x="134" y="123"/>
	<mx:Button x="302" y="121" label="登录" click="onLogin()" fontSize="12"/>
	<mx:Label x="67" y="225" text="系统信息" fontSize="13"/>
	<mx:TextArea id="txtMessage" x="67" y="279" width="287" backgroundColor="#3A6EA5" color="0xffffff" />
	<mx:Button x="270" y="420" label="注销" fontSize="12" click="onDisconnect()" />
	<mx:Script>
		<![CDATA[
			private var nc:NetConnection;
			private var soUser:SharedObject;
		
			private function onLogin():void
			{
				nc = new NetConnection();
				nc.addEventListener(NetStatusEvent.NET_STATUS,onNetStatus);
				nc.connect("rtmp://localhost:8323/MyChatRoom",this.txtName.text);
				nc.client = this;
			}
			
			private function onNetStatus(event:NetStatusEvent):void
			{
				if(event.info.code == "NetConnection.Connect.Success")
				{
					soUser = SharedObject.getRemote("onlineUserList",nc.uri,false);
					if(soUser != null)
					{
						soUser.addEventListener(SyncEvent.SYNC,onSYNC);
						soUser.connect(nc);
						soUser.client = this;
					}
					soUser.send("getServerData","用户【" + this.txtName.text + "】已连接");
				}	
			}
			
			private function onDisconnect():void
			{
				nc.close();
			}
			
			private function onSYNC(event:SyncEvent):void
			{
				var arrUser:Array = new Array();
				for(var str:String  in  soUser.data)
				{
					arrUser.push(soUser.data[str]);
				}
				this.dlOnlineUsers.dataProvider = arrUser;
			}
			
			public function getServerData(message:Object):void
			{
				this.txtMessage.text += message.toString()+"
";
			}
		]]>
	</mx:Script>
	
</mx:Application>