flex4+servlet批量上传

最近刚刚学习flex4 做了一个批量上传，也不知道这个是不是真正意义上的批量上传。
在这里记录一下，以后有时间再详细改进。

UploadServlet

package upload;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.UUID;

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;

/**
 *
 * @author crystal
 */
public class UploadServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     */
    // 定义文件的上传路径


// 限制文件的上传大小

    private int maxPostSize = 100 * 1024 * 1024;

    public UploadServlet() {
        super();
    }

    public void destroy() {
        super.destroy();
    }

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        System.out.println("Access !");
        response.setContentType("text/html;charset=UTF-8");

//保存文件到服务器中
        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 {
                    	String ext=name.substring(name.lastIndexOf(".")+1);
                    	String s = UUID.randomUUID().toString().replaceAll("-", "");
                    	String fileName =s+ "."+ext;
                    	
                        item.write(new File(extracted(request)+"flv\\"+ fileName));
                       // SaveFile s = new SaveFile();

                       // s.saveFile(name);

                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        } catch (FileUploadException e) {
            e.printStackTrace();
            System.out.println(e.getMessage() + "结束");
        }
    }

	private String extracted(HttpServletRequest request) {
		return request.getRealPath("/");
	}

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">

    /**
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     */
    public String getServletInfo() {
        return "Short description";
    }
    // </editor-fold>

}

FileUpload.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" fontSize="12" creationComplete="init()" currentState="selected">
	<s:states>
		<s:State name="selected"/>
		<s:State name="upload"/>
		<s:State name="finsh"/>
	</s:states>
	<fx:Declarations>
		<s:RemoteObject id="uploadid" destination="uploadid" /> 
	</fx:Declarations>
	<fx:Script>  
		<![CDATA[ 
			import flash.events.*;
			
			import mx.collections.ArrayList;
			import mx.core.FlexGlobals;
			
			import upl.CustomFileReferenceList;
			import upl.FileReferenceListExample;
			private var files : FileReferenceList;
			[Bindable]
			private var fileArray : ArrayList= new ArrayList();
			private var serverUrl : String;
			private var userId : String;
			private var allowTypes : XML;
			private var fld:CustomFileReferenceList;
			private var   fff:FileReferenceListExample;
			private function init() : void {
				Security.allowDomain("*");
				var params : Object = FlexGlobals.topLevelApplication.parameters;
				serverUrl = encodeURI(parameters.serverUrl);
				userId = params.userId;
				fld=new CustomFileReferenceList();
				fld.addEventListener(Event.SELECT, showSelect);
				new FileReferenceListExample(fld,finsh);
			}
			private function finsh(e:Event):void{
				currentState="finsh";
				fileArray = new ArrayList();
			}
			private function upload() : void {
				fld.browse();
			}    
			private function showSelect(e:Event):void{
				for(var i:int = 0; i < fld.fileList.length; i++) {
					fileArray.addItem(fld.fileList[i]);
				}
			
			}
			private function onSelect(e:Event) : void {
				//fileArray = new ArrayList(files.fileList);
				for(var i:int = 0; i < fileArray.length; i++) {
					var file:FileReference = fileArray.source[i] as FileReference;
					var request: URLRequest = new URLRequest("http://localhost:8080/wb/UploadServlet")
					file.upload(request);
					//uploadid.uploadid(file.data,file.name); 
				}
				currentState='upload'
			}

			protected function button1_clickHandler(event:MouseEvent):void
			{
			currentState="selected";
			fileArray = new ArrayList();
			}

		]]>  
	</fx:Script>  
	
	<s:VGroup width="577" height="363">
		<s:Button label="选择文件" click="upload();"  includeIn="selected"/>
		<s:List height="114" dataProvider="{fileArray}" itemRenderer="FileShow" includeIn="selected"/>
		<s:List dataProvider="{fileArray}" itemRenderer="FileItem" borderVisible="false" includeIn="upload"/>
		<s:Button includeIn="selected"  click="onSelect(event)" label="上传文件"/>
		<s:Button  includeIn="finsh" label="返回" click="button1_clickHandler(event)"/>
	</s:VGroup>
</s:Application>

FileItem.mxml

<?xml version="1.0" encoding="utf-8"?>
<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009" 
				xmlns:s="library://ns.adobe.com/flex/spark" 
				xmlns:mx="library://ns.adobe.com/flex/mx" >
	
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
	</fx:Declarations>
	<fx:Script>
		<![CDATA[
			private var _data:Object;
			override public function set data( obj : Object ) : void { 
				this._data = obj; 
				var file : FileReference = (this._data as FileReference);
				file.addEventListener(ProgressEvent.PROGRESS, onProgress); 
				file.addEventListener(Event.COMPLETE, onComplete);
				fileName.text = file.name;
			}
			
			override public function get data() : Object { 
				return this._data; 
			}
			
			private function onProgress(e:ProgressEvent) : void {
				cancelBtn.visible = true;
				var loaded : uint = e.bytesLoaded / 1024;
				var total : uint =  e.bytesTotal / 1024;  
				var proc:uint = e.bytesLoaded / e.bytesTotal * 100;    
				bar.setProgress(proc, 100);
				bar.label = proc + "%";
				labelProgress.text = loaded + "kb / " + total + "kb";
			}
			
			private function onComplete(e:Event) : void {
				cancelBtn.visible = false;
				//ExternalInterface.call("onUploadComplete");
			}
			
			private function cancelUpload(e:Event) : void {
				var file : FileReference = (this._data as FileReference);
				file.cancel();
			}
		]]>
	</fx:Script>
	<s:layout>
		<s:VerticalLayout/>
	</s:layout>
	<s:HGroup verticalAlign="middle" paddingTop="5" paddingBottom="5">
		<s:Label id="fileName"/>
		<mx:ProgressBar id="bar"    
						labelPlacement="center"    
						minimum="0"    
						visible="true"    
						maximum="100"    
						label="0%"    
						direction="right"    
						mode="manual"    
						width="200"/>
		<s:Label id="labelProgress" />
		<s:Button id="cancelBtn" label="取消" click="cancelUpload(event)" visible="false" />
	</s:HGroup>
</s:ItemRenderer>

FileShow.mxml

<?xml version="1.0" encoding="utf-8"?>
<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009" 
				xmlns:s="library://ns.adobe.com/flex/spark" 
				xmlns:mx="library://ns.adobe.com/flex/mx" >
	<s:layout>
		<s:BasicLayout/>
	</s:layout>
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
	</fx:Declarations>
	<fx:Script>
		<![CDATA[
			private var _data:Object;
			override public function set data( obj : Object ) : void { 
				this._data = obj; 
				var file : FileReference = (this._data as FileReference);
				fileName.text = file.name;
			}
			override public function get data() : Object { 
				return this._data; 
			}
		]]>
	</fx:Script>
	<s:HGroup verticalAlign="middle" paddingTop="5" paddingBottom="5">
		<s:Label id="fileName"/>
	</s:HGroup>
</s:ItemRenderer>