Flex 利用 Blazeds上传文件

用Flex做业务经常会碰到各种类型的文件上传,如FTP上传、Http上传或者WEB服务形式上传,本文说的利用Blazeds上传文件有点类似Http上传,其原理就是客户端发送byte流,然后服务器端flex.messaging.MessageBrokerServlet接收byte流并生成文件。阅读本文最好了解Flex RemoteObject的使用,了解Blazeds的service调用。

       1、新建Blazeds的文件上传服务,其实就是一个普通的Java类




Public class FileUpDownloadService{

    /**

     *

     * <p>Description:文件上传</p>

     * @param content,文件内容

     * @param fileType,文件类型

     * @return

     * @throws Exception

     * @author Marcus

     * @date 2010-8-31 下午03:57:10

     */

    public void uploadFile(byte[] content, String fileType)throws Exception{

       File file = new File(文件名+ fileType);

       //write file

       FileOutputStream stream = new FileOutputStream(file);

       stream.write(content);

       stream.close();

    }

}


       2、配置remoting-config.xml文件




    <destination id="fileUpDownloadService" channels="my-amf"> 

       <properties>

    <source>FileUpDownloadService</source>

           <scope>application</scope>

       </properties>

    </destination>




    3、flex客户端使用FileRefrence、remoteobject组件进行文件上传

    1)FileRefrence用于文件选择;

    2)remoteobject用户文件上传




<?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" minWidth="800" minHeight="600" creationComplete="init()" width="370" height="180">

    <fx:Script>

       <![CDATA[

           import mx.controls.Alert;

           import mx.rpc.events.FaultEvent;

           import mx.rpc.events.ResultEvent;

           private var file:FileReference = new FileReference();

          

           protected function ro_resultHandler(event:ResultEvent):void

           {

              Alert.show("文件上传成功!");

           }

          

           protected function init():void{

              //选择文件后,加载文件

              file.addEventListener(Event.SELECT, selectHandler);

           }

          

           private function selectHandler(event:Event):void {

              file.load();  //加载文件

           }



           protected function ro_faultHandler(event:FaultEvent):void

           {

              Alert.show("文件上传失败,"+event.fault.faultString);

           }



           protected function btnBrows_clickHandler(event:MouseEvent):void

           {

              file.browse();

           }



           protected function btnUpload_clickHandler(event:MouseEvent):void

           {

              ro.uploadFile(file.data, file.type);

           }

       ]]>

    </fx:Script>

    <fx:Declarations>

       <s:RemoteObject id="ro" destination="fileUpDownloadService"

                     result="ro_resultHandler(event)" fault="ro_faultHandler(event)"/>

    </fx:Declarations>

   

    <s:Button id="btnBrows" click="btnBrows_clickHandler(event)" label="选择文件" x="57" y="60"/>

    <s:Button id="btnUpload" click="btnUpload_clickHandler(event)" label="上传" x="145" y="60"/>

</s:Application>

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