文件上传（无刷新，带进度条，带网速）下载完整

该程序主要解决带进度，无刷新，带网速计算的上传功能，简单明了，不过是本人愚拙的做法，若有更好的做法介绍介绍

java文件：

package com.servlet;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.ProgressListener;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

public class Upload extends HttpServlet {
	
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		resp.setContentType("application/xml");
		final PrintWriter out=resp.getWriter();
		XMLOutputter pw=new XMLOutputter(Format.getPrettyFormat().setEncoding("iso-8859-1"));
		Document doc=(Document)req.getSession().getAttribute("msg"+req.getSession().getId())==null?new Document():(Document)req.getSession().getAttribute("msg"+req.getSession().getId());
		pw.output(doc,out);
		System.out.println(req.getSession().getAttribute("msg"+req.getSession().getId()));
	}

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

		response.setContentType("text/html;charset=utf-8");
		final PrintWriter out=response.getWriter();
		ServletFileUpload upload = new ServletFileUpload();
		upload.setSizeMax(100*1024*1024);
		ProgressListener progressListener = new ProgressListener(){
			   long la