flex文件上传，mmons－fileupload做后台

Java代码
internal function init():void{   
    Security.allowDomain("*");   
     file = new FileReference();     
     file.addEventListener(Event.SELECT, onSelect);     
    file.addEventListener(ProgressEvent.PROGRESS, processHandler);     
    file.addEventListener(IOErrorEvent.IO_ERROR,ioShow);                   
    }   
internal function ioShow(evt: IOErrorEvent){   
     Alert.show(evt.toString(),"IO错误");   
    }   
internal function doSelect():void{   
//文件类型限制，第一个是文件类型选项只显示"png"类型的，第二个是只把.png文件显示出来  
     var imageTypes:FileFilter = new FileFilter("png", "*.png");     
     var allTypes:Array = new Array(imageTypes);     
     file.browse(allTypes);   
    }   
internal function onSelect(evt:Event):void{   
     pic_txt.text = file.name;   
    }   
internal function doUpload():void{   
//指向struts的一个action,或servlte,注意一写要写完整路径   
     var request:URLRequest = new URLRequest("http://localhost:8080/productManage/uploadPic.do");   
       
     fileName = "productImage\\"+new Date().getTime().toString() +".png";   
       request.data = new URLVariables("filename="+fileName);   
          file.upload(request);   
       CursorManager.setBusyCursor();   
    }   
//上传完成更新源   
    internal function processHandler(evt:ProgressEvent):void{   
     if(evt.bytesLoaded == evt.bytesTotal){   
         
      CursorManager.removeBusyCursor();   
         
      var n:Number = new Date().getTime();             
      img.source = fileName +"?time="+n;   
     }   
    }    
<mx:TextInput id="pic_txt" width="150"/>   
   <mx:Button label="选择文件" click="doSelect()"/>   
   <mx:Button label="开始上传" click="doUpload()"/>  
 
  

internal function init():void{
    Security.allowDomain("*");
     file = new FileReference();  
     file.addEventListener(Event.SELECT, onSelect);  
    file.addEventListener(ProgressEvent.PROGRESS, processHandler);  
    file.addEventListener(IOErrorEvent.IO_ERROR,ioShow);                
    }
internal function ioShow(evt: IOErrorEvent){
     Alert.show(evt.toString(),"IO错误");
    }
internal function doSelect():void{
//文件类型限制，第一个是文件类型选项只显示"png"类型的，第二个是只把.png文件显示出来
     var imageTypes:FileFilter = new FileFilter("png", "*.png");  
     var allTypes:Array = new Array(imageTypes);  
     file.browse(allTypes);
    }
internal function onSelect(evt:Event):void{
     pic_txt.text = file.name;
    }
internal function doUpload():void{
//指向struts的一个action,或servlte,注意一写要写完整路径
     var request:URLRequest = new URLRequest("http://localhost:8080/productManage/uploadPic.do");
    
     fileName = "productImage\\"+new Date().getTime().toString() +".png";
       request.data = new URLVariables("filename="+fileName);
          file.upload(request);
       CursorManager.setBusyCursor();
    }
//上传完成更新源
    internal function processHandler(evt:ProgressEvent):void{
     if(evt.bytesLoaded == evt.bytesTotal){
      
      CursorManager.removeBusyCursor();
      
      var n:Number = new Date().getTime();          
      img.source = fileName +"?time="+n;
     }
    } 
<mx:TextInput id="pic_txt" width="150"/>
   <mx:Button label="选择文件" click="doSelect()"/>
   <mx:Button label="开始上传" click="doUpload()"/>


java端:
Java代码
import java.io.File;   
import java.util.List;   
import javax.servlet.http.HttpServletRequest;   
import javax.servlet.http.HttpServletResponse;   
import org.apache.commons.fileupload.DiskFileUpload;   
import org.apache.commons.fileupload.FileItem;   
import org.apache.commons.fileupload.FileUploadException;   
import org.apache.struts.action.Action;   
import org.apache.struts.action.ActionForm;   
import org.apache.struts.action.ActionForward;   
import org.apache.struts.action.ActionMapping;   
public class UploadPicAction extends Action {   
public ActionForward execute(ActionMapping mapping, ActionForm form,   
   HttpServletRequest request, HttpServletResponse response) {   
  response.setContentType("text/html; charset=UTF-8");   
  DiskFileUpload upload = new DiskFileUpload();   
  try {   
   List itemlist = upload.parseRequest(request);   
//itemlist里包含多个参数，所以要判断一下是文件类型，还是参数字段，这里修改一下可以用于多个文件上传  
   for (int i = 0; i < itemlist.size(); i++) {   
    FileItem item = (FileItem) itemlist.get(i);   
    if (item.isFormField())//是表单字段跳过   
     continue;   
    String name = request.getRealPath("") + "\\bin\\"   
      + request.getParameter("filename");//获得Web应用绝对路径，如果路径不在web应用下，由于安全机制，将会说"找不到系统指定路径"   
 
    try {   
     File f = new File(name);   
     item.write(f);   
    } catch (Exception e) {   
     e.printStackTrace();   
    }   
   }   
  } catch (FileUploadException e) {   
   e.printStackTrace();   
  }   
  return null;   
}   
}  













FLEX带进度指示的文件上传

无意百度到一个示例代码，贴出来。
FileUploadServlet.java源码：
package com.fire.servlet;
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.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class FileUploadServlet extends HttpServlet {
// 定义文件的上传路径
private String uploadPath = "D:\\upload\\";
// 限制文件的上传大小
private int maxPostSize = 100 * 1024 * 1024;
public FileUploadServlet() {
  super();
}
public void destroy() {
  super.destroy();
}
  public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
 
  //得到用户需要保存的服装的id
  String dressId = request.getParameter("dressID");
  System.out.println(dressId);
 
  //保存文件到服务器中
  response.setContentType("text/html; charset=UTF-8");
  DiskFileItemFactory factory = new DiskFileItemFactory();
  factory.setSizeThreshold(4096);
  ServletFileUpload upload = new ServletFileUpload(factory);
  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();
     System.out.println(name);
     try
     {
      item.write(new File(uploadPath + name));
     }
     catch (Exception e)
     {
      e.printStackTrace();
     }
    }
   }
  }
  catch (FileUploadException e)
  {
   e.printStackTrace();
  }
}
  public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  doGet(request, response);
}
public void init() throws ServletException {
  // Put your code here
}
}
fileupload.mxml源码：
<mx:application xmlns="*" layout="absolute" xmlns:mx="http://www.adobe.com/2006/mxml" creationcomplete="init();"> </mx:application>
xml 代码
xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns="*" creationComplete="init();"> 
    <mx:Script> 
         
             import flash.net.FileReference; 
             import mx.controls.Alert; 
             import mx.events.CloseEvent; 
             import flash.events.*; 
  
             private var file: FileReference; 
  
             private function init(): void{ 
                 Security.allowDomain("*"); 
                 file = new FileReference(); 
                 file.addEventListener(ProgressEvent.PROGRESS, onProgress); 
                 file.addEventListener(Event.SELECT, onSelect); 
             } 
  
             private function upload(): void{ 
                 file.browse(); 
             } 
              
             private function onSelect(e: Event): void{ 
                 Alert.show("上传 " + file.name + " (共 "+Math.round(file.size)+" 字节)?", 
                            "确认上传", 
                            Alert.YES|Alert.NO, 
                            null, 
                            proceedWithUpload); 
             } 
              
             private function onProgress(e: ProgressEvent): void{ 
                 lbProgress.text = " 已上传 " + e.bytesLoaded  
                     + " 字节，共 " + e.bytesTotal + " 字节"; 
                 var proc: uint = e.bytesLoaded / e.bytesTotal * 100; 
                 bar.setProgress(proc, 100); 
                  bar.label= "当前进度: " + " " + proc + "%"; 
             } 
              
             private function proceedWithUpload(e: CloseEvent): void{ 
                 if (e.detail == Alert.YES){ 
                     var request: URLRequest = new URLRequest("http://localhost:8080/dress/fileUploadServlet"); 
                     try { 
                         file.upload(request); 
                     } catch (error:Error) { 
                         trace("上传失败"); 
                     } 
                      
                 } 
             } 
         ]]> 
     mx:Script> 
       
     <mx:Canvas width="100%" height="100%"> 
         <mx:VBox width="100%" horizontalAlign="center"> 
             <mx:Label id="lbProgress" text="上传"/> 
              <mx:ProgressBar id="bar" labelPlacement="bottom" themeColor="#F20D7A" 
                 minimum="0" visible="true" maximum="100" label="当前进度: 0%"    
                 direction="right" mode="manual" width="200"/> 
             <mx:Button label="上传文件" click="upload();"/>              
         mx:VBox> 
     mx:Canvas> 
mx:Application>