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Flex与Java通信之HttpService方式

发布时间:2020-12-15 03:55:21 所属栏目:百科 来源:网络整理
导读:Flex用RemoteObject方式与Java通信是最常用的方式,这是一种最直观的方式。当然Flex也可以用HttpService与服务器类如servlet通信,这也是本次学习的重点。 这次学习是在上节的基础上进行的。本节学习用到的LoginEvent.as,LoginModule.sa文件代码如上节所示。

Flex用RemoteObject方式与Java通信是最常用的方式,这是一种最直观的方式。当然Flex也可以用HttpService与服务器类如servlet通信,这也是本次学习的重点。

这次学习是在上节的基础上进行的。本节学习用到的LoginEvent.as,LoginModule.sa文件代码如上节所示。

好了,新建一个servlet类LoginServlet.java,代码如下所示:

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package?com.it161.servlet;
import?java.io.IOException;
import?java.io.PrintWriter;
??
import?javax.servlet.ServletException;
import?javax.servlet.http.HttpServlet;
import?javax.servlet.http.HttpServletRequest;
import?javax.servlet.http.HttpServletResponse;
??
publicclass?LoginServlet?extends?HttpServlet?{
????@Override
????protectedvoid?service(HttpServletRequest?req,?HttpServletResponse?resp)
???????????throws?ServletException,?IOException?{
???????//?TODO?Auto-generatedmethod?stub
???????req.setCharacterEncoding("utf-8");
???????resp.setCharacterEncoding("utf-8");
???????PrintWriter?out=resp.getWriter();
???????String?username=req.getParameter("username");
???????String?passworld=req.getParameter("passworld");
???????//System.out.println(username+":"+passworld);
???????if(username.equals("admin")&&passworld.equals("123")){
???????????out.print(true);
???????}else{
???????????out.print(false);
???????}
????}
}

?

这个servlet在web.xml中的配置如下所示:

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<servlet>
?????<servlet-name>LoginServlet</servlet-name>
?????<servlet-class>com.yqsn.servlet.LoginServlet</servlet-class>
????</servlet>
<servlet-mapping>
????<servlet-name>LoginServlet</servlet-name>
????<url-pattern>/LoginServlet</url-pattern>
??</servlet-mapping>

将MyEclipse切换到flash视图,新建一个application文件HttpServiceDemo.mxml,代码如下所示:

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<?xmlversion="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"?minWidth="955"?minHeight="600">
????
????<fx:Script>
???????<![CDATA[
???????????import?com.flex.ases.LoginEvent;
???????????import?com.flex.ases.LoginMess;
???????????import?com.flex.module.LoginModule;
???????????
???????????import?mx.controls.Alert;
???????????import?mx.managers.PopUpManager;
???????????import?mx.rpc.events.FaultEvent;
???????????import?mx.rpc.events.ResultEvent;
???????????privatevar?loginModule:LoginModule=new?LoginModule();
???????????[Bindable]
???????????private?var?username:String;
???????????[Bindable]
???????????private?varpassworld:String;
???????????protectedfunction?login_clickHandler(event:MouseEvent):void
???????????{
??????????????//?TODOAuto-generated?method?stub
???????????????PopUpManager.addPopUp(loginModule,this,true);
???????????????PopUpManager.centerPopUp(this.loginModule);
???????????????loginModule.addEventListener(LoginEvent.LOGIN_EVENT,loginHander);
???????????}
???????????publicfunction?loginHander(event:LoginEvent):void{
??????????????//varobj:Object=event.loginMess?as?Object;
??????????????username=event.loginMess['username'];
??????????????passworld=event.loginMess['passworld'];
??????????????httpServiceSend.send();
???????????}
???????????
???????????protectedfunction?httpServiceSend_faultHandler(event:FaultEvent):void
???????????{
??????????????//?TODOAuto-generated?method?stub
??????????????Alert.show(event.fault.message?as?String,"提示");
??????????????
???????????}
???????????
???????????protectedfunction?httpServiceSend_resultHandler(event:ResultEvent):void
???????????{
??????????????//?TODOAuto-generated?method?stub
??????????????var?result:Boolean=event.result?as?Boolean;
??????????????if(result==true){
??????????????????Alert.show(username+",欢迎您回来!","提示");
??????????????????aaa.text=username+",欢迎您回来!";
??????????????????login.label="";
??????????????????bbb.text="";
??????????????????
??????????????}else{
??????????????????Alert.show("对不起,用户名或密码不存在!","提示");
??????????????}
??????????????//Alert.show("成功了!");
???????????}
???????????
???????]]>
????</fx:Script>
????
????<fx:Declarations>
???????<!--?Place?non-visualelements?(e.g.,?services,?value?objects)?here?-->
???????<s:HTTPService?id="httpServiceSend"??url=" http://localhost:8000/JavaAndFlexDemo/LoginServlet"?useProxy="false"fault="httpServiceSend_faultHandler(event)"result="httpServiceSend_resultHandler(event)"?>
???????????<s:request>
??????????????<username>{username}</username>
??????????????<passworld>{passworld}</passworld>
???????????</s:request>
???????</s:HTTPService>
????</fx:Declarations>
????<s:Label?x="200"?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="393"??y="150"?width="57"??height="27"?label="登陆"?id="login"?fontSize="18"click="login_clickHandler(event)"/>
????<s:Label?x="459"?y="150"?width="37"?height="27"?id="bbb"?fontSize="18"?text="吧!"?verticalAlign="middle"/>
</s:Application>

从代码中我们可以看出,我们先定义一个HttpServlet发送请求httpServiceSend,然后通过下面这种方式存值:

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<s:request?>
??????????????<username>{username}</username>
??????????????<passworld>{passworld}</passworld>
???????????</s:request>

这种方式很简单,我们在后台通过request. getParameter(“参数名”)取值就可以了,当然我们也可以在loginHander(event:LoginEvent)函数中通过下面方式存值并发送请求:

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public?functionloginHander(event:LoginEvent):void{
??????????????//varobj:Object=event.loginMess?as?Object;
??????????????username=event.loginMess['username'];
??????????????passworld=event.loginMess['passworld'];
??????????????var?obj:Object=new?Object;
??????????????obj.username=username;
??????????????obj.passworld=passworld;
??????????????httpServiceSend.send(obj);
???????????}

运行结果是一样的,你可以试试。

好了,程序算是完成了,现在开始验收结果。

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已经用httpservice方式发送到后台并且成功接受了并将结果返回给前台了。

好了,就学习这么多,下节将学习WebService方式。

原创文章,转载请注明出处:http://www.it161.com/article/webDetail?articleid=140111230433

更多原创内容,请访问:http://www.it161.com/

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