servlet+jquery实现文件上次进度条

package com.fei.util; import java.io.File; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletRequest; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.ProgressListener; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class FileUploadUtil { /** * 文件上传保存路径 */ private static final String SAVE_FILEPATH = "/fileupload/"; /** * 文件上传临时保存路径 */ private static final String SAVE_FILE_TMPPATH = "/fileupload/tmp/"; /** * 上传文件的最大值M */ private static final int MAX_FILE_SIZE = 100*1024*1024; /** * 文件数据在内存中超过多少M后，就写入临时文件 */ private static final int THRESHOLD_SIZE = 2*1024*1024; private static final String ENCODING = "UTF-8"; /** * 处理文件上传的表单 * 下载文件，并返回文件名称及普通表单域中其它属性值 * 获取文件名 */ public static Map<String,String> upload(HttpServletRequest request)throws Exception{ Map<String,String> params = new HashMap<String, String>(); String savePath = request.getSession().getServletContext() .getRealPath(SAVE_FILEPATH)+ File.separator; String savePathTemp = request.getSession().getServletContext() .getRealPath(SAVE_FILE_TMPPATH)+ File.separator; File saveFileTempDir = new File(savePathTemp); DiskFileItemFactory factory = new DiskFileItemFactory(); //当内存中文件数据达到THRESHOLD_SIZE后，就写入临时文件中，避免上传大文件时，消化太多内存 factory.setSizeThreshold(THRESHOLD_SIZE); factory.setRepository(saveFileTempDir); ServletFileUpload upload = new ServletFileUpload(factory); upload.setHeaderEncoding(ENCODING); upload.setSizeMax(MAX_FILE_SIZE); FileUploadInfo fileUploadInfo = new FileUploadInfo(); upload.setProgressListener(new FileUploadListener(fileUploadInfo)); request.getSession().setAttribute("uploadInfo", fileUploadInfo); List items = upload.parseRequest(request); Iterator iter = items.iterator(); int fileNum = 1; while(iter.hasNext()){ FileItem item = (FileItem) iter.next(); if (item.isFormField()) {//普通表单域 params.put(item.getFieldName(), item.getString()); } else { String fileName = item.getName().replace("/", "\\"); int i = fileName.lastIndexOf("\\"); fileName = fileName.substring(i+1); //避免重复 fileName = System.currentTimeMillis() + fileName; File uploadedFile = new File(savePath + fileName); item.write(uploadedFile); params.put("fileName0"+fileNum, fileName); fileNum ++; } } return params; } } class FileUploadListener implements ProgressListener{ FileUploadInfo fileUploadInfo = null; public FileUploadListener(FileUploadInfo fileUploadInfo) { this.fileUploadInfo = fileUploadInfo; } @Override public void update(long uploadSize, long totalSize, int itemNum) { this.fileUploadInfo.setTotalSize(totalSize); this.fileUploadInfo.setUploadSize(uploadSize); } }