在Flex中实现cookie功能

1、使用FLEX自带SharedObject
做登录等类的身份验证功能，传统的WEB开发基本上都要使用session或是cookit。然而在Flex中并没有提供直接操作cookit或是 session的方法。经过查资料发现，Flex提供了SharedObject这个本地对象。有人把它称为“Flash Cookie ”。还真是形 象啊，呵，不管怎么说，毕竟还是有解决办法的。

SharedObject提供了下面的操作本地对象的方法：
SharedObject.clear() 删除本地共享对象；
SharedObject.flush() 立即把共享对象数据写入本地文件；
SharedObject.getLocal() 创建或连接本地共享对象；
SharedObject.getSize() 取得本地共享对象的指定大小数据。

程序代码
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init(event)" borderColor="#FFFFFF" themeColor="#FFFFFF" width="800" height="600" backgroundColor="#FFFFFF" textAlign="center" verticalAlign="middle" horizontalAlign="center" backgroundImage="@Embed(source='lt1.jpg')">
<mx:Script>
     <![CDATA[
         import mx.controls.Alert;
         import mx.events.FlexEvent;
         private function init(event:FlexEvent):void {
         // 创建一个本地保存数据的对象s  
         var test:SharedObject = SharedObject.getLocal("testcookie");
         test.data.user = "testuser";
         test.data.psw = "testpwd";
         test.flush(); //提交保存

         var test2: SharedObject = SharedObject.getLocal("testcookie");
         Alert.show(test2.data.user);
         Alert.show(test2.data.psw);
         }
     ]]>
</mx:Script>
</mx:Application>
2、使用JAVASCRIPT实现
flex 中 使用 JavaScript 写 Cookie/**
*写Cookie
*
* name 保存到Cookie中的名称
* text 保存到Cookie中的实际值
* savetime 保存到Cookie中的时间
*/
function writeCookie(name,text,savetime)
{
getUrl("javascript:function writeCookie(name, value, hours) "+
" { "+
"   var expire = ''; "+
"   if(hours != null) "+
"   { " +
" expire = new Date((new Date()).getTime() + hours * 3600000); " +
" expire = '; expires=' + expire.toGMTString();"+
"   }" +
"   document.cookie = name + '=' + escape(value) + expire;"+
"}   "+
"   writeCookie('"+name+"','"+text+"',"+savetime+"); " );

}

/**
*读Cookie
* flexname flex 中定义的变量
* name 保存到Cookie中的名称
*
flexname 例子:

function set user_name(txt:String) {
         username.text=txt; //可以根据情况保存到对应的变量或域中
}

readCookie("user_name",'name');

*/
function readCookie(flexname,name)
{
getUrl( "   Javascript: "+
"   var name   ='"+name+"' ;"+
"   var cookieValue = ''; "+
"   var search = name + '='; "+
"   if(document.cookie.length > 0) "+
"   {   "+
" offset = document.cookie.indexOf(search); "+
" if (offset != -1) "+
" {   "+
"    offset += search.length; "+
"    end = document.cookie.indexOf(';', offset); "+
"    if (end == -1) end = document.cookie.length; "+
"    cookieValue = unescape(document.cookie.substring(offset, end)) "+
" } "+
"   } "+
"   window.document.getElementsByTagName('object')[0].SetVariable ('"+flexname+"',cookieValue);" );
}
3、使用JSP实现
Cookieapp.jsp 文件

<%@ taglib uri="FlexTagLib" prefix="mm"%>
<SCRIPT LANGUAGE="JavaScript">
<!--
function setCookie(userId) {
    document.cookie = "userId="+escape(userId);
}

function getCookie() {
    var cookieStr = document.cookie;
    var index = cookieStr.indexOf("userId=");
    if (index == -1) return null;
    index = cookieStr.indexOf("=", index) + 1;
    var endstr = cookieStr.indexOf(";", index);
    if (endstr == -1) endstr = cookieStr.length;
    window.document.flexApp.SetVariable("userIdJS", unescape(cookieStr.substring(index, endstr)));
}
-->
</SCRIPT>
<mm:mxml name="flexApp" source="cookie.mxml"/>


cookie.mxml

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.macromedia.com/2003/mxml" width="300" height="400">

    <mx:Script>
        function setCookie() {
            srv.send({action: 'set', userId: userId.text});
        }

        function getCookie() {
            srv.send({action: 'get'});
        }

        function setCookieJS() {
            getURL("javascript:setCookie('"+userId.text+"')");
        }

        function getCookieJS() {
            getURL("javascript:getCookie()");
        }

        // callback function invoked by the getCookie() JavaScript function in cookieapp.jsp
        function set userIdJS(userIdJS:String) {
            userId.text=userIdJS;
        }
    </mx:Script>

    <mx:HTTPService id="srv" url="cookie.jsp" useProxy="false" method="POST"
        result="userId.text=srv.result.userId"/>

    <mx:Label text="UserId:"/>
    <mx:TextInput id="userId"/>
    <mx:Button label="Set Cookie Value Using JSP" width="220" click="setCookie()"/>
    <mx:Button label="Set Cookie Value Using JavaScript" click="setCookieJS()"/>
    <mx:Button label="Get Cookie Value Using JSP" width="220" click="getCookie()"/>
    <mx:Button label="Get Cookie Value Using JavaScript" width="220" click="getCookieJS()"/>

</mx:Application>