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Flex与Java通信之RemoteObject方式

发布时间:2020-12-15 03:55:22 所属栏目:百科 来源:网络整理
导读:在学习了flash中的事件机制后,我们就开始学习flex与Java中的3种通信方式。Flex与Java通信有3中方式: ●flex访问Java普通类使用RemoteObject方式,这也是用的最多的一种方式。 ●flex访问Java服务器类(如servlet)用HttpService方式。 ●Flex与WebService

在学习了flash中的事件机制后,我们就开始学习flex与Java中的3种通信方式。Flex与Java通信有3中方式:

●flex访问Java普通类使用RemoteObject方式,这也是用的最多的一种方式。

●flex访问Java服务器类(如servlet)用HttpService方式。

●Flex与WebService交互用WebService方式。

今天就先来学习flex访问普通Java类。在学习之前我们需要考虑这么一个问题:由于我们这3个例子都是以登陆为例子进行的,所以尽量让登陆界面分离出来可以重复使用,这用到Flex中的module。我们怎么将module中的数值传到父窗口去呢?我们又想到上节中学习的自定义事件。好了,既然想通了,就开始今天的学习。

将MyEclipse切换到MyEclipse视图,新建一个与flex交互的普通Java类,代码如下所示:

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package?com.it161.test;
??
public?class?RemoteObjectDemo?{
????public?boolean?login(String?username,String?passworld?){
???????
???????if(username.equals("admin")&&passworld.equals("123")){
???????????returntrue;
???????}else{
???????????returnfalse;
???????}
???????
????}
}

在WebRoot/WEB-INF/flex目录下的remoting-config.xml文件中添加如下所示代码:

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<destination?id="remoteObjectDemo">
???????<properties>
???????????<source>com.yqsn.test.RemoteObjectDemo</source>
???????</properties>
????</destination>

将MyEclipse切换到Flash视图,首先自定义一个事件类LoginEvent.as,为以后传值服务,代码如下所示:

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package?com.it161.ases
{
????import?flash.events.Event;
????
????public?class?LoginEvent?extends?Event
????{??
???????public?static?const?LOGIN_EVENT:String="LOGIN_EVENT";
???????
???????private??var?_loginMess:Object;
???????
???????public?function?LoginEvent(type:String,loginMess:Object=null,?bubbles:Boolean=false,cancelable:Boolean=false)
???????{
???????????this._loginMess=loginMess;
???????????super(type,?bubbles,?cancelable);
???????}
???????
???????public?functionget?loginMess():Object
???????{
???????????return?_loginMess;
???????}
??
???????public?functionset?loginMess(value:Object):void
???????{
???????????_loginMess?=?value;
???????}
??
????}
}

在这个类中我们定义了一个事件类型LOGIN_EVENT,定义了一个Object类型的变量,用于存值。

接着新建一个登陆信息的VO类LoginMess.as,为以后存贮用户信息服务,代码如下所示:

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package?com.it161.ases
{
????publicclass?LoginMess
????{
???????
???????private??var?_username:String;
???????
???????privatevar?_passworld:String;
???????
???????publicfunction?LoginMess()
???????{
???????????
???????}
??
???????publicfunctionget?passworld():String
???????{
???????????return?_passworld;
???????}
??
???????publicfunctionset?passworld(value:String):void
???????{
???????????_passworld?=?value;
???????}
??
???????publicfunctionget?username():String
???????{
???????????return?_username;
???????}
??
???????publicfunctionset?username(value:String):void
???????{
???????????_username?=?value;
???????}
??
????}
}

新建一个登陆界面,新建一个MXMLModule文件LoginModule.mxml,代码如下所示:

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<?xmlversion="1.0"?encoding="utf-8"?>
<s:Module?xmlns:fx=" http://ns.adobe.com/mxml/2009"
?????????xmlns:s=" library://ns.adobe.com/flex/spark"
?????????xmlns:mx=" library://ns.adobe.com/flex/mx"?width="256"?height="213">
????
????<fx:Script>
???????<![CDATA[
???????????import?com.flex.ases.LoginEvent;
???????????
???????????import?mx.controls.Alert;
???????????import?mx.events.CloseEvent;
???????????import?mx.managers.PopUpManager;
???????????
???????????protectedfunction?login_clickHandler(event:MouseEvent):void
???????????{
??????????????//?TODOAuto-generated?method?stub
??????????????var?loginMess:Object=new?Object;
??????????????loginMess.username=userName.text;
??????????????loginMess.passworld=passworld.text;
??????????????if(userName.text==""?||passworld.text==""){
??????????????????Alert.show("用户名或密码不能为空!");
??????????????????return;
??????????????}
??????????????this.dispatchEvent(newLoginEvent(LoginEvent.LOGIN_EVENT,loginMess));
??????????????userName.text="";
??????????????passworld.text="";
??????????????PopUpManager.removePopUp(this);
???????????}
???????????
???????????protectedfunction?loginTitleWindow_closeHandler(event:CloseEvent):void
???????????{
??????????????//?TODO?Auto-generatedmethod?stub
??????????????userName.text="";
??????????????passworld.text="";
??????????????PopUpManager.removePopUp(this);
???????????}
???????????
???????]]>
????</fx:Script>
????
????<fx:Declarations>
???????<!--?Place?non-visualelements?(e.g.,?services,?value?objects)?here?-->
????</fx:Declarations>
???????
????????<s:TitleWindow?x="1"?y="1"?width="256"height="213"?title="登陆"id="loginTitleWindow"?close="loginTitleWindow_closeHandler(event)"?>
??
???????<s:Form?width="100%"?height="183"?>
???????????
???????????<s:FormItem?left="60"?height="39"?width="224"?label="用户名"?required="true"??>
??????????????<s:TextInput?id="userName"?/>
???????????</s:FormItem>
???????????
???????????<s:FormItem?required="true"?width="224"?label="密码"?>
??????????????<s:TextInput?id="passworld"?displayAsPassword="true"?/>
???????????</s:FormItem>????
???????????
???????????<s:FormItem?width="227">
??????????????<s:Button?id="login"?label="登陆"?click="login_clickHandler(event)"/>
???????????</s:FormItem>
???????
???????</s:Form>
???????????
???????</s:TitleWindow>?
</s:Module>

这个页面以后我们反复使用,这就是module文件的优点之一。在这个页面中我们不处理与Java交互的部分,因为既然是公共页面,我们应该将于Java交互的部分放在相应引用的文件中。

接着创建主页面RemoteObjectDemo.mxml,代码如下所示:

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<?xml?version="1.0"encoding="utf-8"?>
<s:Application?xmlns:fx=" http://ns.adobe.com/mxml/2009"
??????????????xmlns:s=" library://ns.adobe.com/flex/spark"
??????????????xmlns:mx=" library://ns.adobe.com/flex/mx"?width="100%"?height="100%">
????
????<fx:Script>
???????<![CDATA[
???????????import?com.flex.ases.LoginEvent;
???????????import?com.flex.ases.LoginMess;
???????????import?com.flex.component.LoginTitleWindow;
???????????import?com.flex.module.LoginModule;
???????????
???????????import?mx.collections.ArrayCollection;
???????????import?mx.controls.Alert;
???????????import?mx.managers.PopUpManager;
???????????import?mx.rpc.events.FaultEvent;
???????????import?mx.rpc.events.ResultEvent;
???????????[Bindable]
???????????privatevar?loginMess:LoginMess=new?LoginMess();
???????????privatevar?loginModule:LoginModule=new?LoginModule();
???????????protectedfunction?login_clickHandler(event:MouseEvent):void
???????????{
??????????????PopUpManager.addPopUp(loginModule,this,true);
??????????????PopUpManager.centerPopUp(loginModule);
??????????????loginModule.addEventListener(LoginEvent.LOGIN_EVENT,getLoginMess);
???????????}
???????????publicfunction?getLoginMess(event:LoginEvent):void{
??????????????var?username:String=event.loginMess['username'];
??????????????var?passworld:String=event.loginMess['passworld'];
??????????????loginMess.username=username;
??????????????remoteObj.login(username,passworld);
??????????????
???????????}
???????????
???????????protectedfunction?remoteObj_resultHandler(event:ResultEvent):void
???????????{
??????????????//?TODOAuto-generated?method?stub
??????????????var?str:Boolean=event.result?as?Boolean;
??????????????if(str){
??????????????????Alert.show(loginMess.username+",欢迎您回来...","提示");
??????????????????aaa.text=loginMess.username+",欢迎归来...";
??????????????????bbb.text="";
??????????????????login.label="";
??????????????}else{
??????????????????Alert.show("登录失败,您输入的用户名或者密码不存在!","提示");
??????????????}
??????????????
???????????}
???????????
???????????protectedfunction?remoteObj_faultHandler(event:FaultEvent):void
???????????{
??????????????//?TODOAuto-generated?method?stub
??????????????Alert.show(event.fault.message,"出错了");
???????????}
???????????
???????]]>
????</fx:Script>
????
????<fx:Declarations>
???????<!--?Place?non-visualelements?(e.g.,?value?objects)?here?-->
???????<s:RemoteObject?id="remoteObj"?destination="remoteObjectDemo"result="remoteObj_resultHandler(event)"fault="remoteObj_faultHandler(event)"?/>
????</fx:Declarations>
????
???????<s:Label?x="219"?y="150"?width="182"?height="27"?fontSize="18"?id="aaa"?text="您还没有登陆,现在就"?verticalAlign="middle"/>
???????<mx:LinkButton?x="409"??y="150"?width="57"??height="27"?label="登陆"?id="login"?fontSize="18"click="login_clickHandler(event)"/>
???????<s:Label?x="478"?y="150"?width="37"?height="27"?id="bbb"?fontSize="18"?text="吧!"?verticalAlign="middle"/>
???????
</s:Application>

好了,页面与类算是处理完了,打开服务器并部署项目,运行felx页面RemoteObjectDemo.mxml,如下所示:

? ? ? ? ? ? ? ? ? ? ? ? ? ?

当我们点击“登陆”按钮后,弹出module页面,如下所示:

当我们输入的用户名和密码都正确时则提示你登陆正确:

输入错误则提示你输入不正确:

可以看出,我们输入的用户名与密码与Java中的login方法进行了交互。

好了,就学习这么多,下节将学习HttpService方式。

原创文章,转载请注明出处:http://www.it161.com/article/webDetail?articleid=140111224840

更多原创内容,请访问:http://www.it161.com/

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