PHP+Flex实现多人聊天

      平常我们用PHP+JS语言写的多人聊天室代码都是使用Ajax技术，每隔一定的时间刷新聊天数据。

现在使用Flex+PHP语言，通过socket实现来实现客户端和服务端的交互。只要客户端发送新的消息给服务端，服务端就会自动把客户端的消息推送到每个客户端上。具体实现如下：

1、服务端代码（PHP实现）

<?PHP
/**
* patServer
* PHP socket server base class
* Events that can be handled:
*   * onStart
*   * onConnect
*   * onConnectionRefused
*   * onClose
*   * onShutdown
*   * onReceiveData
*
* @version 1.1
* @author   Stephan Schmidt <[e-mail]>
* @package patServer
*/
class patServer{
/**
* information about the project
* @var array $systemVars
*/
var $systemVars   = array(

    "appName"   => "patServer",
    "appVersion"   => "1.1",
    "author"   => array("Stephan Schmidt <[e-mail]>", )
   );

/**
* port to listen
* @var integer   $port
*/
   var $port   = 10000;

/**
* domain to bind to
* @var string $domain
*/
   var $domain   = "localhost";

/**
* maximum amount of clients
* @var integer $maxClients
*/
   var $maxClients = -1;

/**
* buffer size for socket_read
* @var integer $readBufferSize
*/
   var $readBufferSize   = 128;

/**
* end character for socket_read
* @var integer $readEndCharacter
*/
   var $readEndCharacter = "\n";

/**
* maximum of backlog in queue
* @var integer $maxQueue
*/
   var $maxQueue = 500;

/**
* debug mode
* @var boolean $debug
*/
   var $debug   = true;

/**
* debug mode
* @var string $debugMode
*/
   var $debugMode = "text";

/**
* debug destination (filename or stdout)
* @var string $debugDest
*/
   var $debugDest = "stdout";

/**
* empty array, used for socket_select
* @var array $null
*/
   var $null   = array();

/**
* all file descriptors are stored here
* @var array $clientFD
*/
   var $clientFD = array();

/**
* needed to store client information
* @var array $clientInfo
*/
   var $clientInfo = array();

/**
* needed to store server information
* @var array $serverInfo
*/
   var $serverInfo = array();

/**
* amount of clients
* @var integer   $clients
*/
   var $clients = 0;

/**
* create a new socket server
*
* @access public
* @param string   $domain   domain to bind to
* @param integer   $port   port to listen to
*/
function patServer( $domain = "localhost", $port = 8083 ){
   $this->domain = $domain;
   $this->port   = $port;

   $this->serverInfo["domain"]         = $domain;
   $this->serverInfo["port"]         = $port;
   $this->serverInfo["servername"]     = $this->systemVars["appName"];
   $this->serverInfo["serverversion"] = $this->systemVars["appVersion"];

   set_time_limit( 0 );
}

/**
* set maximum amount of simultaneous connections
*
* @access public
* @param int $maxClients
*/
function setMaxClients( $maxClients ){
   $this->maxClients = $maxClients;
}

/**
* set debug mode
*
* @access public
* @param mixed $debug [text|htmlfalse]
* @param string $dest destination of debug message (stdout to output or filename if log should be written)
*/
function setDebugMode( $debug, $dest = "stdout" ){
   if( $debug === false ){
    $this->debug = false;
    return true;
   }

   $this->debug   = true;
   $this->debugMode = $debug;
   $this->debugDest = $dest;
}

/**
* start the server
*
* @access public
* @param int $maxClients
*/
function start(){
   $this->initFD = @socket_create( AF_INET, SOCK_STREAM, 0 );
   if( !$this->initFD )
    die( "patServer: Could not create socket." );

   // adress may be reused
   socket_setopt( $this->initFD, SOL_SOCKET, SO_REUSEADDR, 1 );

   // bind the socket
   if( !@socket_bind( $this->initFD, $this->domain, $this->port ) ){
    @socket_close( $this->initFD );
    die( "patServer: Could not bind socket to ".$this->domain." on port ".$this->port." ( ".$this->getLastSocketError( $this->initFd )." )." );
   }

   // listen on selected port
   if( !@socket_listen( $this->initFD, $this->maxQueue ) )
    die( "patServer: Could not listen ( ".$this->getLastSocketError( $this->initFd )." )." );

   $this->sendDebugMessage( "Listening on port ".$this->port.". Server started at ".date( "H:i:s", time() ) );

   // this allows the shutdown function to check whether the server is already shut down
   $GLOBALS["_patServerStatus"] = "running";
   // this ensures that the server will be sutdown correctly
   register_shutdown_function( array( $this, "shutdown" ) );

   if( method_exists( $this, "onStart" ) )
    $this->onStart();

   $this->serverInfo["started"] = time();
   $this->serverInfo["status"]   = "running";

   while( true ){
    $readFDs = array();
    array_push( $readFDs, $this->initFD );

    // fetch all clients that are awaiting connections
    for( $i = 0; $i < count( $this->clientFD ); $i++ )
     if( isset( $this->clientFD[$i] ) )
      array_push( $readFDs, $this->clientFD[$i] );

    // block and wait for data or new connection
    $ready = @socket_select( $readFDs, $this->null, $this->null, NULL );

    if( $ready === false ){
     $this->sendDebugMessage( "socket_select failed." );
     $this->shutdown();
    }

    // check for new connection
    if( in_array( $this->initFD, $readFDs ) ){
     $newClient = $this->acceptConnection( $this->initFD );

     // check for maximum amount of connections
     if( $this->maxClients > 0 ){
      if( $this->clients > $this->maxClients ){
       $this->sendDebugMessage( "Too many connections." );

       if( method_exists( $this, "onConnectionRefused" ) )
        $this->onConnectionRefused( $newClient );

       $this->closeConnection( $newClient );
      }
     }

     if( --$ready <= 0 )
      continue;
    }

    // check all clients for incoming data
    for( $i = 0; $i < count( $this->clientFD ); $i++ ){
     if( !isset( $this->clientFD[$i] ) )
      continue;

     if( in_array( $this->clientFD[$i], $readFDs ) ){
      $data = $this->readFromSocket( $i );

      // empty data => connection was closed
      if( !$data ){
       $this->sendDebugMessage( "Connection closed by peer" );
       $this->closeConnection( $i );
      }else{
       $this->sendDebugMessage( "Received ".trim( $data )." from ".$i );

       if( method_exists( $this, "onReceiveData" ) )
        $this->onReceiveData( $i, $data );
      }
     }
    }
   }
}

/**
* read from a socket
*
* @access private
* @param integer $clientId internal id of the client to read from
* @return string $data   data that was read
*/
function readFromSocket( $clientId ){
   // start with empty string
   $data   = "";

   // read data from socket
   while( $buf = socket_read( $this->clientFD[$clientId], $this->readBufferSize ) ){
    $data .= $buf;

    $endString = substr( $buf, - strlen( $this->readEndCharacter ) );
    if( $endString == $this->readEndCharacter )
     break;
    if( $buf == NULL )
     break;
   }

   if( $buf === false )
    $this->sendDebugMessage( "Could not read from client ".$clientId." ( ".$this->getLastSocketError( $this->clientFD[$clientId] )." )." );

   return $data;
}

/**
* accept a new connection
*
* @access public
* @param resource &$socket socket that received the new connection
* @return int    $clientID internal ID of the client
*/
function acceptConnection( &$socket ){
   for( $i = 0 ; $i <= count( $this->clientFD ); $i++ ){
    if( !isset( $this->clientFD[$i] ) || $this->clientFD[$i] == NULL ){
     $this->clientFD[$i] = socket_accept( $socket );
     socket_setopt( $this->clientFD[$i], SOL_SOCKET, SO_REUSEADDR, 1 );
     $peer_host = "";
     $peer_port = "";
     socket_getpeername( $this->clientFD[$i], $peer_host, $peer_port );
     $this->clientInfo[$i] = array(
              "host"   => $peer_host,
              "port"   => $peer_port,
              "connectOn" => time()
             );
     $this->clients++;

     $this->sendDebugMessage( "New connection ( ".$i." ) from ".$peer_host." on port ".$peer_port );

     if( method_exists( $this, "onConnect" ) )
      $this->onConnect( $i );
     return $i;
    }
   }
}

/**
* check, whether a client is still connected
*
* @access public
* @param integer $id client id
* @return boolean $connected true if client is connected, false otherwise
*/
function isConnected( $id ){
   if( !isset( $this->clientFD[$id] ) )
    return false;
   return true;
}

/**
* close connection to a client
*
* @access public
* @param int $clientID internal ID of the client
*/
function closeConnection( $id ){
   if( !isset( $this->clientFD[$id] ) )
    return false;

   if( method_exists( $this, "onClose" ) )
    $this->onClose( $id );

   $this->sendDebugMessage( "Closed connection ( ".$id." ) from ".$this->clientInfo[$id]["host"]." on port ".$this->clientInfo[$id]["port"] );

   @socket_close( $this->clientFD[$id] );
   $this->clientFD[$id] = NULL;
   unset( $this->clientInfo[$id] );
   $this->clients--;
}

/**
* shutdown server
*
* @access public
*/
function shutDown(){
   if( $GLOBALS["_patServerStatus"] != "running" )
    exit;
   $GLOBALS["_patServerStatus"] = "stopped";

   if( method_exists( $this, "onShutdown" ) )
    $this->onShutdown();

   $maxFD = count( $this->clientFD );
   for( $i = 0; $i < $maxFD; $i++ )
    $this->closeConnection( $i );

   @socket_close( $this->initFD );

   $this->sendDebugMessage( "Shutdown server." );
   exit;
}

/**
* get current amount of clients
*
* @access public
* @return int $clients amount of clients
*/
function getClients(){
   return $this->clients;
}

/**
* send data to a client
*
* @access public
* @param int   $clientId ID of the client
* @param string $data   data to send
* @param boolean $debugData flag to indicate whether data that is written to socket should also be sent as debug message
*/
function sendData( $clientId, $data, $debugData = true ){
   if( !isset( $this->clientFD[$clientId] ) || $this->clientFD[$clientId] == NULL )
    return false;

   if( $debugData )
    $this->sendDebugMessage( "sending: \"" . $data . "\" to: $clientId" );

   if( !@socket_write( $this->clientFD[$clientId], $data ) )
    $this->sendDebugMessage( "Could not write '".$data."' client ".$clientId." ( ".$this->getLastSocketError( $this->clientFD[$clientId] )." )." );
}

/**
* send data to all clients
*
* @access public
* @param string $data   data to send
* @param array $exclude client ids to exclude
*/
function broadcastData( $data, $exclude = array(), $debugData = true ){
   if( !empty( $exclude ) && !is_array( $exclude ) )
    $exclude = array( $exclude );

   for( $i = 0; $i < count( $this->clientFD ); $i++ ){
    if( isset( $this->clientFD[$i] ) && $this->clientFD[$i] != NULL && !in_array( $i, $exclude ) ){
     if( $debugData )
      $this->sendDebugMessage( "sending: \"" . $data . "\" to: $i" );

     if( !@socket_write( $this->clientFD[$i], $data ) )
      $this->sendDebugMessage( "Could not write '".$data."' client ".$i." ( ".$this->getLastSocketError( $this->clientFD[$i] )." )." );
    }
   }
}

/**
* get current information about a client
*
* @access public
* @param int   $clientId ID of the client
* @return array $info   information about the client
*/
function getClientInfo( $clientId ){
   if( !isset( $this->clientFD[$clientId] ) || $this->clientFD[$clientId] == NULL )
    return false;
   return $this->clientInfo[$clientId];
}

/**
* send a debug message
*
* @access private
* @param string $msg message to debug
*/
function sendDebugMessage( $msg ){
   if( !$this->debug )
    return false;

   $msg = date( "Y-m-d H:i:s", time() ) . " " . $msg;

   switch( $this->debugMode ){
    case "text":
     $msg = $msg."\n";
     break;
    case "html":
     $msg = htmlspecialchars( $msg ) . "<br />\n";
     break;
   }

   if( $this->debugDest == "stdout" || empty( $this->debugDest ) ){
    echo $msg;
    flush();
    return true;
   }

   error_log( $msg, 3, $this->debugDest );
   return true;
}

/**
* return string for last socket error
*
* @access public
* @return string $error last error
*/
function getLastSocketError( &$fd ){
   $lastError = socket_last_error( $fd );
   return "msg: " . socket_strerror( $lastError ) . " / Code: ".$lastError;
}
function onReceiveData($ip,$data){
  $this->broadcastData( $data,array(), true );
}
}
$patServer = new patServer();
$patServer->start();
?>

 

2、客户端（Flex实现）

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" fontSize="12" creationComplete="initApp()" width="369" height="326">
<mx:Script>
        <![CDATA[
        		import flash.system.SecurityDomain;	//沙箱安全尚未解决
                import flash.net.Socket; //导入类包
                import flash.utils.ByteArray;//ByteArray在读取数据时使用
             //   private var socket: Socket;
                private var sc:Socket;
                internal function initApp():void
                {
                	 	
                	 	Security.allowDomain("*");//所有的写法
                		sc  = new Socket();
                		
                        sc.connect("192.168.15.85",10000);//执行连接
                        //监听连接成功事件
                        sc.addEventListener(Event.CONNECT,funConnect);
                        //监听关闭事件
                        sc.addEventListener(Event.CLOSE,funClose);
                        //监听服务器新信息
                        sc.addEventListener(ProgressEvent.SOCKET_DATA,funSocket);
                        //
                }
                internal function funConnect(event:Event):void
                {
                        myText.text+="连接已建立 \n";
                }
                internal function funClose(event:Event):void
                {
                        myText.text+="连接已关闭 \n";
                }
                internal function sendMessage(msg:String):void //发送数据到服务器
                {
                        //新建一个ByteArray来存放数据
                        var message:ByteArray=new ByteArray();
                        //写入数据，使用writeUTFBytes以utf8格式传数据，避免中文乱码
                        message.writeUTFBytes(msg+"\n");
                        //写入socket的缓冲区
                        sc.writeBytes(message);
//调用flush方法发送信息
                        sc.flush();
                        //清空消息框
                        myInput.text="";
                }
                //接受服务器信息
                internal function funSocket(event:ProgressEvent):void
                {
                        var msg:String="";
                //循环读取数据，socket的bytesAvailable对象存放了服务器传来的所有数据
                        while(event.target.bytesAvailable)
                        {
                                //强制使用utf8格式，避免中文乱码
                                msg+=sc.readMultiByte(sc.bytesAvailable,"utf-8");
                                //使用\n换行符号把信息切开
                                var arr:Array=msg.split('\n');
                                for(var i:int=0;i<arr.length;i++)
                                {
                                        if(arr[i].length>1)
                                        {
                                                //正则表达式，回车符
                                                var myPattern:RegExp=/\r/;
                                                //删除回车符
                                                arr[i]=arr[i].replace(myPattern,'');
                                                //在聊天框中输出
                                                myText.text+=arr[i]+"\n";
                                        }
                                }
                                myText.verticalScrollPosition = myText.maxVerticalScrollPosition;//滚动到最下面
                        }
                                
                }
        ]]>
</mx:Script>
        <mx:TextArea x="10" y="42" width="344" height="247" id="myText"/>
        <mx:TextInput x="10" y="297" width="270" id="myInput"/>
        <mx:Button x="288" y="298" label="发送" id="myBtn" click="sendMessage(myName.text+'：'+myInput.text)"/>
        <mx:TextInput x="10" y="10" width="344" text="名字" id="myName"/>
        
</mx:Application>

 

注意：该代码客户端放在本地可以执行，但是放到服务器上会出现安全沙箱问题，本人至今还未解决，遗憾