学习笔记 剖析Flex上传文件功能如何实现

<?xmlversionxmlversion="1.0"encoding="utf-8"?> 
<mx:Applicationxmlns:mxmx:Applicationxmlns:mx=http://www.adobe.com/2006/mxml
creationComplete="init()"layout="absolute"width="497"height="136"
backgroundGradientAlphas="[1.0,1.0]"backgroundGradientColors="[#F2F8F8,#45E7E5]"> 
<mx:Scriptsourcemx:Scriptsource="upload.as"></mx:Script> 
<mx:Style> 
.myfont{font-size:13pt}  
</mx:Style> 
<mx:Buttonxmx:Buttonx="10"y="95"label="上传文件"click="pickfile()"styleName="myfont"/> 
<mx:Labelxmx:Labelx="10"y="10"text="文件上传"styleName="myfont"/> 
<mx:ProgressBarxmx:ProgressBarx="10"y="40"width="457"themeColor="#F20D7A"minimum="0"
mode="manual"maximum="100"id="progress1"label="当前进度:0%"styleName="myfont"fontWeight="normal"/> 
<mx:Labelxmx:Labelx="146"y="98"width="321"id="lbProgress"styleName="myfont"textAlign="right"/> 
</mx:Application> 
 
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1//ActionScriptfile  
2importflash.events.Event;  
3importflash.net.FileFilter;  
4importflash.net.FileReference;  
5privatevarfileRef:FileReference=newFileReference();  
6privatefunctioninit():void{  
7  
8}  
9  
10privatefunctionpickfile():void{  
11varimageTypes:FileFilter=newFileFilter("图片(*.jpg,*.jpeg,*.gif,*.png)","*.jpg;*.jpeg;*.gif;*.png");  
12vartextTypes:FileFilter=newFileFilter("文本文件(*.txt","*.txt;");  
13varofficeType:FileFilter=newFileFilter("Office文件(*.doc,*.xls","*.doc;*.xls");  
14varanyType:FileFilter=newFileFilter("所有文件(*.*)","*.*");  
15varallTypes:Array=newArray(imageTypes,textTypes,officeType,anyType);  
16fileRef.addEventListener(Event.SELECT,selectHandler);  
17fileRef.addEventListener(Event.COMPLETE,completeHandler);  
18fileRef.addEventListener(ProgressEvent.PROGRESS,progressHandler);  
19fileRef.addEventListener("ioError",ioerrorHandler);  
20try{  
21varsuccess:Boolean=fileRef.browse(allTypes);  
22}catch(error:Error){  
23trace("Unabletobrowseforfiles."+error.toString());  
24}  
25}  
26privatefunctionioerrorHandler(event:Event):void{  
27trace("Unabletouploadfile."+event.toString());  
28}  
29privatefunctionprogressHandler(event:ProgressEvent):void{  
30lbProgress.text="已上传"+(event.bytesLoaded/1024).toFixed(2)+"K，共"+(event.bytesTotal/1024).toFixed(2)+"K";  
31varproc:uint=event.bytesLoaded/event.bytesTotal*100;  
32progress1.setProgress(proc,100);  
33progress1.label="当前进度:"+""+proc+"%";  
34  
35}  
36privatefunctionselectHandler(event:Event):void{  
37varrequest:URLRequest=newURLRequest("http://localhost:9080/upload/upload.jsp")  
38try  
39{  
40fileRef.upload(request);  
41}  
42catch(error:Error)  
43{  
44trace("Unabletouploadfile."+error.toString());  
45}  
46}  
47privatefunctioncompleteHandler(event:Event):void{  
48trace("uploaded");  
49}  
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