Flex多文件上传

用flash builder4.0+javaee做的多文件上传的小例子，关于环境配置就不多讲了，这个可以百度google一下，应该一大把。

界面大致如下：

源码：FlexMutifileUpload.mxml

<?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"   creationComplete="application1_creationCompleteHandler(event)"    minWidth="955" minHeight="600"><fx:Script><![CDATA[import mx.collections.ArrayCollection;import mx.controls.Alert;import mx.core.FlexGlobals;import mx.events.FlexEvent;import mx.formatters.DateFormatter;import mx.utils.URLUtil;private var fileRefList:FileReferenceList=new FileReferenceList();public var fileAC:ArrayCollection=new ArrayCollection();public var tempAC:ArrayCollection=new ArrayCollection();private var date_ext:String="";private var request:URLRequest;//public var serverName:String=URLUtil.getServerName(FlexGlobals.topLevelApplication.url);    //public var serverPort:int=URLUtil.getPort(FlexGlobals.topLevelApplication.url);protected function application1_creationCompleteHandler(event:FlexEvent):void{// TODO Auto-generated method stubfileRefList.addEventListener(Event.SELECT,fileSelectedHandler);}protected function fileSelectedHandler(event:Event):void{for(var i:int=0;i<fileRefList.fileList.length;i++){var fileRef:FileReference=FileReference(fileRefList.fileList[i]);var obj:Object=new Object();obj.fileRefrence=fileRef;//将进度条信息绑定obj.fileName=fileRef.name;//文件名称obj.fileType=fileRef.type;//文件类型obj.fileSize=(fileRef.size/1024).toFixed(2)+"KB";//四舍五入到小数点后两位this.txtUploadImg.text=fileRef.name;fileAC.addItem(obj);tempAC.addItem(obj);}this.dgFiles.dataProvider=fileAC;}protected function btnBrowse_clickHandler(event:MouseEvent):void{// TODO Auto-generated method stubvar imgArray:Array=[];imgArray.push(new FileFilter("图片(*.jpg,*.png,*.bmp)","*.jpg;*.png;*.bmp"));fileRefList.browse(imgArray);}protected function btnUpload_clickHandler(event:MouseEvent):void{// TODO Auto-generated method stubfor(var i:int=0;i<fileAC.length;i++){var fileRef:FileReference=FileReference(fileAC[i]['fileRefrence']); var url:String=encodeURI(URLUtil.getFullURL(FlexGlobals.topLevelApplication.url,"/")+"FlexMutifileUpload/FileUpload");request=new URLRequest(url);try{fileRef.upload(request,fileRef.name);}catch(er:Error){Alert.show("上传文件出错！"+er.message);}}}public function deleteFileFromDG(event:MouseEvent):void{     var id:int=this.dgFiles.selectedIndex; fileAC.removeItemAt(id); fileAC.refresh();}]]></fx:Script><fx:Declarations><!-- 将非可视元素（例如服务、值对象）放在此处 --></fx:Declarations><s:BorderContainer horizontalCenter="0" verticalCenter="6" borderVisible="false" borderWeight="0"  width="646" height="377"><mx:DataGrid id="dgFiles" horizontalCenter="-55" verticalCenter="-9" height="281" width="514"><mx:columns><mx:DataGridColumn headerText="文件名" dataField="fileName"/><mx:DataGridColumn headerText="类型" dataField="fileType"/><mx:DataGridColumn headerText="大小" dataField="fileSize"/><mx:DataGridColumn headerText="操作" width="300"><mx:itemRenderer><fx:Component><mx:HBox width="100%" height="100%" ><mx:ProgressBar id="myProgressbar" minimum="0" maximum="100"  width="150" height="90%"labelPlacement="center"  source="{data.fileRefrence}" /><s:Button label="删除" click="outerDocument.deleteFileFromDG(event)"  /></mx:HBox></fx:Component></mx:itemRenderer></mx:DataGridColumn></mx:columns></mx:DataGrid><s:TextInput id="txtUploadImg" x="10" y="343" width="225" editable="false"/><s:Button id="btnBrowse" x="271" y="344" label="浏览"  click="btnBrowse_clickHandler(event)"  width="125"/><s:Button id="btnUpload" x="400" y="344" label="上传" click="btnUpload_clickHandler(event)"  width="110"/></s:BorderContainer></s:Application>

后台是基于java servlet实现的，下面是FileUpload.java文件

package com.coderloft.util;import java.io.File;import java.io.IOException;import java.io.PrintWriter;import java.util.Iterator;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;/** * Servlet implementation class FileUpload */public class FileUpload extends HttpServlet {private static final long serialVersionUID = 1L;       //定义文件保存路径private String savePath="d:\\upload\\";// 限制文件的上传大小private int maxPostSize = 100 * 1024 * 1024;    /**     * @see HttpServlet#HttpServlet()     */    public FileUpload() {        super();        // TODO Auto-generated constructor stub    }/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubresponse.setCharacterEncoding("UTF-8");response.setContentType("text/html;charset=UTF-8");processRequest(request,response);}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubresponse.setCharacterEncoding("UTF-8");response.setContentType("text/html;charset=UTF-8");processRequest(request,response);}protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    PrintWriter out=response.getWriter();    //获取服务器上路径位置    String fileRename = request.getParameter("filename");    String path=getServletContext().getRealPath("\\uploadfile");       //判断文件是否存在    File file=new File(path);    if(!file.exists()){    boolean createSuccess=file.mkdirs();    if(!createSuccess){    System.out.println("文件创建失败，不能上传");    return;    }    }    //保存文件到服务器中    DiskFileItemFactory factory=new DiskFileItemFactory();    factory.setSizeThreshold(4096);//设置缓存大小    ServletFileUpload upload=new ServletFileUpload(factory);    upload.setHeaderEncoding("UTF-8");    upload.setSizeMax(maxPostSize);    try{    List fileItems=upload.parseRequest(request);    Iterator iter=fileItems.iterator();    while(iter.hasNext()){    FileItem item=(FileItem) iter.next();    if(!item.isFormField()){         String name=item.getName();    if (fileRename != null && fileRename.length() > 0) {name = fileRename;}try {item.write(new File(path +"\\"+ name));System.out.println("上传成功：" + path);} catch (Exception e) {e.printStackTrace();}    }    }    }catch(Exception ex){    ex.printStackTrace();    } }}

关于文件上传，在这里多说一句：

文件上传时，考虑到中文路径的问题，试着在你的浏览器中输入一个中文路径，看浏览器是否使用的是UTF-8的编码格式，如果浏览器编码正确，那么要上传文件时，在flex端将字符encodeURI一下，看看你的tomcat服务器编码是否修改为UTF-8,修改方法是：找到tomcat安装目录下的,我的目录是：D:\Program Files\apache-tomcat-6.0.16\conf

conf/server.xml,找到<Connector节点 添加 URIEncoding="utf-8",

去下载源码