java带进度条的文档上传

import java.util.List; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.util.Iterator; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.*; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class receiveServlet extends HttpServlet { protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException { // TODO Auto-generated method stub doPost(arg0, arg1); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload fileUpload = new ServletFileUpload(factory); class MyProgressListener implements ProgressListener { private HttpServletRequest request = null; MyProgressListener(HttpServletRequest request) { this.request = request; } public void update(long pBytesRead, long pContentLength, int pItems) { double percentage = ((double) pBytesRead / (double) pContentLength); // 上传的进度保存到session，以便processServlet.java使用 double i = percentage * 100; request.getSession().setAttribute("uploadPercentage", String.valueOf((int) i)); } } try { fileUpload.setProgressListener(new MyProgressListener(request)); List items = fileUpload.parseRequest(request); Iterator iter = items.iterator(); while (iter.hasNext()) { FileItem item = (FileItem) iter.next(); if (item.isFormField()) { } else { String fileName = item.getName(); File uploadedFile = new File("c:\\" + System.currentTimeMillis() + fileName.substring(fileName.lastIndexOf("."))); item.write(uploadedFile); } } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } response.sendRedirect("index.jsp"); } }