Flex4多文件上传示例

---》Flex

<?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()">
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
	</fx:Declarations>
	<fx:Script>  
		<![CDATA[ 
			import flash.events.*;
			
			import mx.collections.ArrayCollection;
			import mx.collections.ArrayList;
			import mx.controls.Alert;
			import mx.core.FlexGlobals;
			
			private var files : FileReferenceList;
			[Bindable]
			private var fileArray : ArrayList;
			
			private var serverUrl : String;
			private var userId : String;
			private var allowTypes : XML;
			
			private var xlsFilter:FileFilter = new FileFilter("定值单", "*.xls;*.xlsx");  
			private var setFileReference:FileReferenceList = new FileReferenceList();
			private var request:URLRequest=new URLRequest("http://localhost:8080/fileTest/upload/servlet/FileUploadServlet");
			[Bindable]
			private var resultArr:ArrayCollection = new ArrayCollection();
			
			private function init() : void {
				Security.allowDomain("*");
				setFileReference.addEventListener(Event.SELECT, onSelect);
			}
			
			private function upload() : void {
				
				setFileReference.browse([xlsFilter]); 
			}    
			
			private function onSelect(e:Event) : void {
				fileArray = new ArrayList(setFileReference.fileList);
				for(var i:int = 0; i < fileArray.length; i++) {
					var file:FileReference = fileArray.source[i] as FileReference;
					file.addEventListener(Event.COMPLETE,onComplete); 
					file.upload(request);
				}
			}
			
			private function onComplete(event:Event):void{
//				Alert.show((event.target as FileReference).name+"上传完成！"); 
				var obj:Object = new Object();				
				obj.result = (event.target as FileReference).name+"上传完成！";
				resultArr.addItem(obj);
			}  
			
		]]>  
	</fx:Script>  
	
	<s:VGroup>
		<s:Button label="上传文件" click="upload();" />
		<s:List id="list" dataProvider="{resultArr}" labelField="result" width="250"/>
	</s:VGroup>
</s:Application>

---》Servlet
需要commons-fileupload.jar  commons-io.jar

package servlet;
import java.io.File;
import java.io.IOException;
import java.util.Date;
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;
  
 public class FileUploadServlet extends HttpServlet { 
     // 定义文件的上传路径 
     private String uploadPath = "c://"; 
     // 限制文件的上传大小 
     private static final long maxFileSize = 104857600;
  
    
     protected void processRequest(HttpServletRequest request, 
             HttpServletResponse response) throws ServletException, IOException { 
         response.setContentType("text/html; charset=UTF-8");
        Date date = new Date();
        try {
            DiskFileItemFactory factory = new DiskFileItemFactory();
            factory.setSizeThreshold(4096);
            ServletFileUpload upload = new ServletFileUpload(factory);
            upload.setSizeMax(maxFileSize);
            upload.setHeaderEncoding("UTF-8");
            List fileItems = upload.parseRequest(request);
            Iterator iter = fileItems.iterator();
            // 依次处理每一个文件：
            String dictId = request.getParameter("dictId");
            while (iter.hasNext()) {
                FileItem item = (FileItem) iter.next();
                if (!item.isFormField()) {
                    String fileName = item.getName();
                    long fileSize = item.getSize();
                    if (fileName != null && fileName.trim().length() > 0 && fileSize < maxFileSize) {
                        // 取得上传文件后缀名
//                        int index=fileName.lastIndexOf(".");
//                        String docType = fileName.substring(index);
//                        String docName=fileName.substring(0,index);
                        File dir=new File(getServletContext().getRealPath("upload/template/"));
                        if(!dir.exists()){
                            dir.mkdirs();
                        }
                        String filePath = "upload/template/" + fileName;
//                        String filePath = "upload/template/" + date.getTime() + docType;
                        File uploadFile = new File(getServletContext().getRealPath(filePath));
                        item.write(uploadFile);
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
     } 
  
     protected void doGet(HttpServletRequest request, 
             HttpServletResponse response) throws ServletException, IOException { 
         this.doPost(request, response); 
     } 
  
     protected void doPost(HttpServletRequest request, 
             HttpServletResponse response) throws ServletException, IOException { 
         processRequest(request, response); 
     } 
  
}

---》参考
http://blog.csdn.net/huangssssx/article/details/5785801#
http://javacrazyer.iteye.com/blog/707693