使用Flash Cookie技术在客户端永久保存HTTP Cookie

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/**
* Package laohan.flashcookie
* Author:handaoliang
* Create Date:2009.11.03
* Last Mofied Date:2009.11.03
* CopyRights:Handaoliang.com All Rights Reserved.
**/
package laohan.flashcookie {
//注：由于我没有装Flex，所以只好使用Flash CS3来嵌入。
//如果使用Flash Developer，则MovieClip这个包可以不包含。
import flash.display.MovieClip;
import flash.net.SharedObject;
import flash.external.ExternalInterface;

public class myFlashCookie extends MovieClip {//如果使用Flex，可以不继承这个类。
private var cookieTimeOut:uint;
private var cookieName:String;
private var cookieSharedObj:SharedObject;
private var currentCookie:Object;
private var cookieValue:String;

//构造函数。
public function myFlashCookie(cName:String = "handaoliang", timeOut:uint=3600) {
cookieName = cName;
cookieTimeOut = timeOut;
cookieSharedObj = SharedObject.getLocal(cName, "/" );
if(isCookieExist(cName)){//如果FlashCookies存在。
currentCookie = getCookies(cName);
//调用JavaScript里的jsSetCookies方法来设置HTTPCookie
ExternalInterface.call("jsSetCookies",{fcookie:currentCookie});
//trace(currentCookie);
}
}
//到期删除Cookies
public function clearTimeOut():void {
var obj:* = cookieSharedObj.data.cookie;
if(obj == undefined){
return;
}
for(var key in obj){
if(obj[key] == undefined || obj[key].time == undefined || isTimeOut(obj[key].time)){
delete obj[key];
}
}
cookieSharedObj.data.cookie = obj;
cookieSharedObj.flush();
}
//添加Cookies( key-value )
public function saveCookies(key:String, value:*):void {
var today:Date = new Date();
key = "key_"+key;
value.time = today.getTime();
if(cookieSharedObj.data.cookie == undefined){
var obj:Object = {};
obj[key] = value;
cookieSharedObj.data.cookie = obj;
}else{
cookieSharedObj.data.cookie[key] = value;
}
cookieSharedObj.flush();
}
//删除当前Cookies
public function removeCookies(key:String):void {
if (isCookieExist(key)) {
delete cookieSharedObj.data.cookie["key_" + key];
cookieSharedObj.flush();
}
}
//通过Key来获取Cookies值。
public function getCookies(key:String):Object{
return isCookieExist(key)?cookieSharedObj.data.cookie["key_"+key]:null;
}
//检查Cookies是否存在。
public function isCookieExist(key:String):Boolean{
key = "key_" + key;
return cookieSharedObj.data.cookie != undefined && cookieSharedObj.data.cookie[key] != undefined;
}
//检查Cookies的到期时间
private function isTimeOut(time:uint):Boolean {
var today:Date = new Date();
return time + cookieTimeOut * 1000 < today.getTime();
}
//取得Cookies的到期时间;
public function getTimeOut():uint {
return cookieTimeOut;
}
//取得Cookies名称。
public function getName():String {
return cookieName;
}
//清除所有的Cookies值。
public function clearCookies():void {
cookieSharedObj.clear();
}
}
}

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//先定义一个全局变量
var flashCookiesValue = Null;
var jsSetCookies = function(flahCookieValue){
var o = arguments[0];
flashCookiesValue = o.fcookie;//在SWF执行时传递过来的值。
document.cookie="handaoliang="+flashCookiesValue+";path=/;expires=Fri, 04-Dec-2009 08:44:07 GMT;domain=handaoliang.com";
};