java+jquery文件上传 无刷新 带进度条，监控文件上传情况

package servlet.upload; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; 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 ProgressUploadServlet extends HttpServlet { protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setHeader("Cache-Control", "no-store");// 禁止浏览器缓存 resp.setHeader("Pragrma", "no-cache");// 禁止浏览器缓存 resp.setDateHeader("Expires", 0);// 禁止浏览器缓存 UploadStatus status = (UploadStatus) req.getSession(true).getAttribute( "uploadstatus"); if (status == null) { this.log("没有上传文件!"); return; } long startTime = status.getStartTime(); long currentTime = System.currentTimeMillis(); long time = (currentTime - startTime) / 1000 + 1; // 已传输的时间 单位：s double velocity = ((double) status.getByteRead()) / (double) time;// 传输速度 // bytes/s double totalTime = status.getContentLength() / velocity;// 估计时间 double timeLeft = totalTime - time;// 剩余时间 int percent = (int) (100 * (double) status.getByteRead() / (double) status .getContentLength());// 已完成的百分比 double length = ((double) status.getByteRead() / 1024 / 1024);// 已完成数 // 单位：M double totalLength = ((double) status.getContentLength()) / 1024 / 1024;// 总长度： // 单位：M // 格式: // 百分比||已完成数(M)||文件总长度(M)||传输速率(K)||已用时间(S)||估计总时间(S)||估计剩余时间(S)||正在上传第几个文件 String value = percent + "||" + length + "||" + totalLength + "||" + velocity + "||" + time + "||" + totalTime + "||" + timeLeft + "||" + status.getItems(); resp.getWriter().print(value);// 输出给浏览器进度条 } protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { UploadStatus status = new UploadStatus();// 上传状态 UploadListener listener = new UploadListener(status);// 监听器 req.getSession(true).setAttribute("uploadstatus", status); ServletFileUpload upload = new ServletFileUpload( new DiskFileItemFactory());// 解析 upload.setProgressListener(listener);// 设置上传的listener try { // upload.setSizeMax(10*1024*1024);//设置大小，超出则抛出FileUploadException List itemList = upload.parseRequest(req); for (Iterator it = itemList.iterator(); it.hasNext();) { FileItem item = (FileItem) it.next(); if (!item.isFormField())// 如果是非表单数据 { if(item.getName().length()<=0)return;//表示后面的文件域没有选中文件 this.log("file size: "+((double)item.getSize()/1024/1024)+"M"); this.log("file type："+item.getContentType());//文件类型 this.log("File: " + item.getName()); this.log("File Extension："+item.getName().substring(item.getName().lastIndexOf("."))); //方式一：直接采用FileItem输出，注意C盘是否有此文件夹 item.write(new File("C:\\upload_test", item.getName())); // //方式二：采用文件输入输出流，输出文件 /*// 统一Linux与windows的路径分隔符 String fileName =item.getName().replace("/", "\\"); //fileName = fileName.substring(fileName.lastIndexOf("\\")); File saved = new File("C:\\upload_test", fileName); saved.getParentFile().mkdirs();// 保证路径存在 InputStream ins = item.getInputStream(); OutputStream ous = new FileOutputStream(saved); byte[] tmp = new byte[1024]; int len = -1; while ((len = ins.read(tmp)) != -1) { ous.write(tmp, 0, len); } ous.close(); ins.close(); this.log("已保存文件：" + saved);*/ } } } catch (Exception e) { this.log("上传发生错误: " + e.getMessage()); } } }