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>