flex上传文件

flex端的AS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:

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())[color=red]//是表单字段跳过 [/color]   
     continue;    
    String name = request.getRealPath("") + "[url=file://\\bin\\]\\bin\\[/url]"    
      + 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;    
}    
}   

转自http://www.iteye.com/topic/233248