工具类保存登录信息

此工具类可以让我们保存登录以后的信息到硬盘当中去，几个方法特别有用，上代码：

/** * This class stores/restores a login/password from the Local Hard Drive * * */ public class LocalCredentials{private var cookie:LocalMap;public function get login():String{return cookie.getValue("login");}public function get password():String{return cookie.getValue("password");}/** cookie identifier **/private var _cookieName:String;public function set cookieName(value:String):void{_cookieName = value;loadCookie();}public function LocalCredentials(cookieName:String=null){if (cookieName){_cookieName = cookieName;loadCookie();}}private function loadCookie():void{cookie = new LocalMap(_cookieName);if (!cookie.hasKey("login")){cookie.put("login", null);cookie.put("password", null);}}/** * Save a login and a password string * in a Shared Object * * @param login * @param password **/public function save(login:String, password:String):void{cookie.put("login", login);cookie.put("password", password);}/** * Clear the cookie **/public function clear():void{cookie.removeAll();}}

flex当中没有类似于Java当中Map使用键值的类，因此自己封装一个：

public class LocalMap implements IMap{/** * @private * The Shared object instance. */private var sharedObject:SharedObject;private var minDiskSpace:int;/** * Constructor. */public function LocalMap(id:String, localPath:String=null, minDiskSpace:int=0, encoding:uint=3){try{sharedObject = SharedObject.getLocal(getValidName(id), localPath);setEncoding(encoding);this.minDiskSpace = minDiskSpace;sharedObject.flush(minDiskSpace);}catch (e:Error){new Error("You haven't allowed Flash Player to write data on your hard drive");}}private function setEncoding(encoding:int):void{if (encoding != ObjectEncoding.AMF0 && encoding != ObjectEncoding.AMF3 &&encoding != ObjectEncoding.DEFAULT)sharedObject.objectEncoding = ObjectEncoding.DEFAULT;elsesharedObject.objectEncoding = ObjectEncoding.AMF3; }private function getValidName(id:String):String{ return id.replace(/[~%&/;:/"/'<>/?#]/g, "");}//------------------------------------------------------------------------//// Implementation : IMap////------------------------------------------------------------------------/** * @inheritDoc */public function put(key:*, value:*):void{sharedObject.data[key] = value;sharedObject.flush(minDiskSpace);}/** * @inheritDoc */public function remove(key:*):*{var value:* = sharedObject.data[key];delete sharedObject.data[key];sharedObject.flush(minDiskSpace);return value;}/** * @inheritDoc */public function hasKey(key:*):Boolean{var k:*;var data:Object = sharedObject.data;for (k in data){if (k == key)return true;}return false;}/** * @inheritDoc */public function hasValue(value:*):Boolean{var key:*;var data:Object = sharedObject.data;for (key in data){if (data[key] == value)return true;}return false;}/** * @inheritDoc */public function getKey(value:*):*{var key:*;var data:Object = sharedObject.data;for (key in data){if (data[key] == value)return key;}return null;}/** * @inheritDoc */public function getValue(key:*):*{return sharedObject.data[key];}/** * @inheritDoc */public function get keys():Array{var ret:Array = [];var key:*;var data:Object = sharedObject.data;for (key in data)ret.push(key);return ret;}/** * @inheritDoc */public function get values():Array{var ret:Array = [];var key:*;var data:Object = sharedObject.data;for (key in data)ret.push(data[key]);return ret;}/** * @inheritDoc */public function removeAll():void{var key:*var data:Object = sharedObject.data;for (key in data) delete data[key]; sharedObject.flush(minDiskSpace);}/** * @inheritDoc */public function get length():int{var result:int = 0;var key:*;for (key in sharedObject.data)result += 1;return result;}}