Flex FTP文件上传

 Flex FTP文件上传原理就是利用Flex Socket组件与FTP服务器进行网络通讯并根据FTP协议进行指令发生、接收，数据的传输和接收。本文指的是Flex web应用的FTP文件上传，具体实现有下述3个工作：

    1）上传文件选择、加载，可以使用Flex的FileRefrence组件；

    2）socket创建、连接、ftp用户登录信息的验证；

    3）文件数据发送；

       先假设要上传的文件名称为：demo.doc, 该上传的文件内容为fileData，下述为FTP文件上传的核心类。

 

package fileupload {     import flash.events.Event;     import flash.events.IEventDispatcher;     import flash.events.IOErrorEvent;     import flash.events.ProgressEvent;     import flash.events.SecurityErrorEvent;     import flash.net.FileReference;     import flash.net.Socket;     import flash.utils.ByteArray;     import flash.utils.clearInterval;     import flash.utils.setInterval;       public class FtpFileUpDownload     {        private var ftpSocket:Socket;        private var ftpResponce:String;        private var dataSocket:Socket;        private var dataResponse:String;        private var clientIP:String;        private var clientPort:uint;        private var canceled:Boolean = false;        private var dispatcher:IEventDispatcher;        private var fileName:String;        private var fileData:ByteArray;        private var _isAnonymous:Boolean = false;        private var _userName:String;        private var _serverIP:String;        private var _userPwd:String;        private var _userDir:String;        private var _serverPort:uint = 21;        private var intervalID:int;        //        public function FtpFileUpDownload(dispatcher:IEventDispatcher)        {            this.dispatcher = dispatcher;        }          /**         * isAnonymous, FTP 是否允许 匿名访问,默认为false         */        public function get isAnonymous():Boolean{            return _isAnonymous;        }        public function set isAnonymous(value:Boolean):void{            _isAnonymous = value;        }               public function get userName():String{            return _userName;        }        public function set userName(value:String):void{            _userName = value;        }               public function get serverIP():String{            return _serverIP;        }        public function set serverIP(value:String):void{            _serverIP = value;        }               public function get userPwd():String{            return _userPwd;        }        public function set userPwd(value:String):void{            _userPwd = value;        }               /**         * userDir, FTP 用户上传目录         */        public function get userDir():String{            return _userDir;        }        public function set userDir(value:String):void{            _userDir = value;        }               public function get serverPort():uint{            return _serverPort;        }        public function set serverPort(value:uint):void{            _serverPort = value;        }               /**         * upload file, data is null is not allowed.         */        public function upload(data:ByteArray, fileName:String):void{            this.fileName = fileName;            this.fileData = data;            if(data==null){               dispatcher.dispatchEvent(new FileUpDownloadEvent(FileUpDownloadEvent.ERROR,"Data is null is not allowed!"));               return;            }            if(!check()) return;            connect();        }               private function check():Boolean{            var blnResult:Boolean = true;            if(!isAnonymous){               if(StringUtil.isEmpty(userName) || StringUtil.isEmpty(userPwd)){//                   dispatcher.dispatchEvent(new FileUpDownloadEvent(FileUpDownloadEvent.ERROR,                      "请输入用户名和口令!"));                   blnResult = false;               }            }            if(StringUtil.isEmpty(serverIP)){               dispatcher.dispatchEvent(new FileUpDownloadEvent(FileUpDownloadEvent.ERROR,                   "请输入FTP服务器IP地址!"));               blnResult = false;            }            return blnResult;        }               private function connect():void{            ftpSocket = new Socket(serverIP, serverPort);            ftpSocket.addEventListener(ProgressEvent.SOCKET_DATA, ftpSocketDataHandle);      ftpSocket.addEventListener(SecurityErrorEvent.SECURITY_ERROR,ftpSocketSecurityErrorHandle);     ftpSocket.addEventListener(IOErrorEvent.IO_ERROR,ftpIOErrorHandle);        }               private function ftpIOErrorHandle(evt:IOErrorEvent):void {            dispatcher.dispatchEvent(new FileUpDownloadEvent(FileUpDownloadEvent.ERROR,evt.text));        }