完整的Flex多文件上传实例

下面的例子展示了用Flex上传文件的完整代码。

基本实现的功能：
- 一次选取多个文件上传
- 上传过程中显示每个文件的进度
- 如果是图片，可以上传之前进行预览
- 可以选择逐个文件上传，也可以选择同时上传多个文件，这样就是对服务器压力稍微大一些
技术点：
- 闭包方法（在c#里，也叫匿名委托方法），根据我的体会，如果不使用闭包方法，更新进度条会是一个比较麻烦的问题，除非另外编写一个类，这个问题稍后再研究
- DataGrid中需要用到itemRenderer，从而在每行都显示进度条和删除、取消按钮
软件环境
- Flex Builder 3
- Flash player 10
  - Flash player 9 （特别说明：如果使用这个版本的flashPlayer，FileFerence没有load方法和data属性，也就无法实现本地预览图片，请去掉load和data有关调用即可）
  - 在Flex Builder 3中默认是Flash Player 9，只能自己修改一下配置文件，切换到10，方法请参考Targeting Flash Player 10

还是先看一下程序吧，稍后再看代码

程序演示

源码下载：

客户端代码：fileUpload.xml-------------------------------------------------------------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
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<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
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layout="vertical" horizontalAlign="left" fontSize="12"
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initialize="init()"
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viewSourceURL="srcview/index.html">
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<mx:NumberFormatter id="filesizeFormatter" useThousandsSeparator="true"/>
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<mx:Script>
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<![CDATA[
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import mx.events.CollectionEvent;
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import mx.formatters.NumberFormatter;
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import mx.formatters.CurrencyFormatter;
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import mx.collections.ArrayCollection;
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import mx.controls.Alert;
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private var fileRefs: FileReferenceList = new FileReferenceList();
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//这个地址是我测试用的服务器地址
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private var urlrequest: URLRequest = new URLRequest("http://localhost:8080/abc/UploadFile");
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[Bindable]
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private var selectedFiles: ArrayCollection = new ArrayCollection([]);
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private var singleThreadFiles: Array = [];
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[Bindable]
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private var useSingleThread: Boolean = true;
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private function init(): void
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{
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Security.allowDomain("*");
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fileRefs.addEventListener(Event.SELECT, fileSelectHandler);
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fileRefs.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
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fileRefs.addEventListener(Event.COMPLETE, completeHandler);
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addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
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}
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private function selectFile(): void
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{
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fileRefs.browse([new FileFilter("Images (*.jpg, *.jpeg, *.gif, *.png)", "*.jpg;*.jpeg;*.gif;*.png"),
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new FileFilter("所有文件(*.*)", "*.*")
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]);
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}
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private function fileSelectHandler(event: Event): void
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{
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for each (var f: FileReference in fileRefs.fileList)
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{
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selectedFiles.addItem(f);
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}
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}
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private function uploadFile(): void
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{
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for each (var f: FileReference in selectedFiles)
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{
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try
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{
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f.upload(urlrequest);
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}
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catch (e: Error)
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{
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Alert.show(e.message);
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}
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}
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}
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private function singleThreadUploadFile(): void
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{
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//FIFO：逐个从列表中取出，进行同步上传
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if (singleThreadFiles.length > 0)
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{
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var f: FileReference = singleThreadFiles.pop() as FileReference;
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f.addEventListener(Event.COMPLETE, doSingleUploadFileComplete);
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f.upload(urlrequest);
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}
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}
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private function doSingleUploadFileComplete(event: Event): void
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{
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var f: FileReference = event.target as FileReference;
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f.removeEventListener(Event.COMPLETE, doSingleUploadFileComplete);
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singleThreadUploadFile();
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}
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private function ioErrorHandler(e:IOErrorEvent): void
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{
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Alert.show(e.text);
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}
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private function completeHandler(e: Event): void
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{
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img.source = e.target.data;
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}
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private function showImage(e: Event): void
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{
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var f: FileReference = (e.target as DataGrid).selectedItem as FileReference;
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f.addEventListener(Event.COMPLETE, completeHandler);
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f.load();
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}
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public function removeFile(f: FileReference): void
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{
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var index: int = selectedFiles.getItemIndex(f);
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if (index != -1)
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selectedFiles.removeItemAt(index);
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}
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]]>
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</mx:Script>
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<mx:VBox>
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<mx:HBox width="100%">
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<mx:Button id="selectFileButton" label="浏览

" click="selectFile()"/>
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<mx:Box width="100%" horizontalAlign="right">
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<mx:Button click="selectedFiles.removeAll();" label="清空"/>
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</mx:Box>
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</mx:HBox>
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<mx:DataGrid id="files" dataProvider="{selectedFiles}" change="showImage(event)">
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<mx:columns>
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<mx:DataGridColumn width="150" headerText="文件名" dataField="name" />
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<mx:DataGridColumn headerText="大小(字节)" dataField="size">
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<mx:itemRenderer>
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<mx:Component>
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<mx:Label text="{outerDocument.filesizeFormatter.format(data.size)}" textAlign="right"/>
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</mx:Component>
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</mx:itemRenderer>
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</mx:DataGridColumn>
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<mx:DataGridColumn headerText="上传进度" width="300">
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<mx:itemRenderer>
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<mx:Component>
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<mx:HBox fontSize="10" fontWeight="normal" fontThickness="1">
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<mx:Script>
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<![CDATA[
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import flash.profiler.showRedrawRegions;
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import mx.controls.Alert;
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import mx.controls.ProgressBar;
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private function initProgressBar(event: Event): void
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{
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//使progressbar与file关联，从而产生进度条
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var pb: ProgressBar = event.target as ProgressBar;
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pb.label = "%3%%";
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pb.setProgress(0, 100);
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var f: FileReference = data as FileReference;
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//使用闭包方法，更新进度条
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f.addEventListener(ProgressEvent.PROGRESS,
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function(event: ProgressEvent): void
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{
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pb.setProgress(event.bytesLoaded, event.bytesTotal);
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}
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);
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f.addEventListener(DataEvent.UPLOAD_COMPLETE_DATA,
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function (event: DataEvent): void
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{
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//服务器端一定要返回数据，否则，这个方法就不起作用了
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pb.label = event.data;
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}
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);
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}
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]]>
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</mx:Script>
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<mx:ProgressBar verticalCenter="true" width="100%" paddingLeft="5" paddingRight="5"
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maximum="100" minimum="0" labelPlacement="center" mode="manual"
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label="%3%%" textAlign="left"
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creationComplete="initProgressBar(event)"/>
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<mx:LinkButton label="Cancel">
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<mx:click>
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<![CDATA[
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var f: FileReference = data as FileReference;
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f.cancel();
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]]>
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</mx:click>
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</mx:LinkButton>
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<mx:LinkButton label="Delete">
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<mx:click>
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<![CDATA[
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var f: FileReference = data as FileReference;
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outerDocument.removeFile(f);
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]]>
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</mx:click>
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</mx:LinkButton>
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</mx:HBox>
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</mx:Component>
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</mx:itemRenderer>
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</mx:DataGridColumn>
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</mx:columns>
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</mx:DataGrid>
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</mx:VBox>
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<mx:HBox>
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<mx:Button label="上传">
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<mx:click>
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<![CDATA[
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if (useSingleThread)
177

{
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//逐个上传
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singleThreadFiles = selectedFiles.toArray().concat();
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singleThreadFiles.reverse();
181

singleThreadUploadFile();
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}
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else
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{
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//多个文件同时上传
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uploadFile();
187

}
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]]>
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</mx:click>
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</mx:Button>
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<mx:CheckBox id="checkboxSingleThread" label="同时上传多个文件" selected="{!useSingleThread}"
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change="useSingleThread = !checkboxSingleThread.selected"/>
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</mx:HBox>
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<mx:Image id="img" width="400" height="300"/>
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</mx:Application>

服务器端代码：-----------------------------------------------------------------------------------------------------------

package com.java.test;
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import java.io.File;
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import java.io.IOException;
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import java.util.Iterator;
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import java.util.List;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.apache.commons.fileupload.FileItem;
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import org.apache.commons.fileupload.FileUploadException;
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import org.apache.commons.fileupload.disk.DiskFileItemFactory;
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import org.apache.commons.fileupload.servlet.ServletFileUpload;
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public class UploadFile extends HttpServlet {
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private static final long serialVersionUID = 5425836142860976977L;
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/**
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* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
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* @param request servlet request
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* @param response servlet response
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*/
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// 定义文件的上传路径
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private String uploadPath = "d:\\files\\";
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// 限制文件的上传大小
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private int maxPostSize = 100 * 1024 * 1024; //最大100M
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public UploadFile() {
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super();
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}
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public void destroy() {
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super.destroy();
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}
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protected void processRequest(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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System.out.println("Access !");
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response.setContentType("text/html;charset=UTF-8");
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//保存文件到服务器中
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DiskFileItemFactory factory = new DiskFileItemFactory();
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factory.setSizeThreshold(4096);
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ServletFileUpload upload = new ServletFileUpload(factory);
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upload.setHeaderEncoding("utf-8");
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upload.setSizeMax(maxPostSize);
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try {
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List fileItems = upload.parseRequest(request);
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Iterator iter = fileItems.iterator();
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while (iter.hasNext()) {
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FileItem item = (FileItem) iter.next();
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if (!item.isFormField()) {
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String name = item.getName();
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System.out.println(name);
54

try {
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item.write(new File(uploadPath + name));
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response.getWriter().write("上传成功。");
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} catch (Exception e) {
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e.printStackTrace();
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response.getWriter().write(e.getMessage());
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}
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}
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}
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} catch (FileUploadException e) {
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e.printStackTrace();
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response.getWriter().write(e.getMessage());
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System.out.println(e.getMessage() + "结束");
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}
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}
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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processRequest(request, response);
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}
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/**
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* Handles the HTTP <code>POST</code> method.
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* @param request servlet request
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* @param response servlet response
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*/
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protected void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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processRequest(request, response);
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}
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/**
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* Returns a short description of the servlet.
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*/
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public String getServletInfo() {
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return "Short description";
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}
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}

代码稍微有点多，请见谅。

posted @ 2009-08-03 20:30 静候良机阅读(26411) 评论(1) 编辑收藏举报

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完整的Flex多文件上传实例

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