Flex 带进度条上传文件代码

在网上找的一个Flex文件上传代码，记录下来，以后用到的时候可以马上能用：

1. Flex 前端代码

<?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" minWidth="955" minHeight="600"
      creationComplete="init();">
 <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[
  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/firstFlex/fileUploadServlet");
  try {
  file.upload(request);
  } catch (error:Error) {
     trace("上传失败");
  }
  
  }
  }
  ]]>
 </fx: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>
</s:Application>

2. java Servlet端代码：

??

package test;

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 {

 private static final long serialVersionUID = 1L;
//存放文件路径
 private String uploadPath = "D:/Tomcat 6.0/webapps/firstFlex/bin-debug/";


 private int maxPostSize = 100 * 1024 * 1024;

 public FileUploadServlet() {
  super();
 }

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

  public void doGet(HttpServletRequest request,HttpServletResponse response)
   throws ServletException,IOException {
 

//  String dressId = request.getParameter("dressID");
//     System.out.println(dressId);
 
  //防止标题中还有中文字符是出现乱码
  request.setCharacterEncoding("UTF-8");
  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,IOException {
  doGet(request,response);
 }

 public void init() throws ServletException {
  // Put your code here
 }

}

3.下面是web.xml文件Servlet的配置部分，把它加入到web.xml中即可。

  <servlet>  
        <servlet-name>fileUploadServlet</servlet-name>  
        <servlet-class>test.FileUploadServlet</servlet-class>  
    </servlet>      
    <servlet-mapping>  
        <servlet-name>fileUploadServlet</servlet-name>  
        <url-pattern>/fileUploadServlet</url-pattern>  
    </servlet-mapping>