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plupload批量上传分片功能，

对于文件比较大的情况下，plupload支持分片上传，后台代码如下：

 

    /**** 方法：upLoadSpecialProgramPictrue* 方法说明：本地节目导入* @return* @author     wangHao* @throws Exception* @date       2015年6月9日*/@RequestMapping("/localUpLoadProgram")@ResponseBodypublic void localUpLoadProgram(@RequestParam("file") CommonsMultipartFile[] file,HttpServletResponse response,HttpServletRequest request) throws Exception {boolean isMultipart = ServletFileUpload.isMultipartContent(request);if(isMultipart){String fileName = "";Integer chunk = 0, chunks = 0;//检查文件目录，不存在则创建String relativePath = "/plupload/files/";String realPath = ConfigUtil.class.getResource("/").getPath();File folder = new File(realPath + relativePath);if (!folder.exists()) {folder.mkdirs();}DiskFileItemFactory diskFactory = new DiskFileItemFactory();// threshold 极限、临界值，即硬盘缓存 1M diskFactory.setSizeThreshold(4 * 1024);ServletFileUpload upload = new ServletFileUpload(diskFactory);// 设置允许上传的最大文件大小（单位MB）upload.setSizeMax(1024 * 1048576);upload.setHeaderEncoding("UTF-8");List<FileItem> fileList = new ArrayList<FileItem>();fileList.add(file[0].getFileItem());Iterator<FileItem> it = fileList.iterator();FileItem item = it.next();String name = item.getFieldName();InputStream input = item.getInputStream();fileName = item.getName();chunk =  Integer.parseInt(request.getParameter("chunk"));chunks =  Integer.parseInt(request.getParameter("chunks"));   // 处理上传文件内容if (!item.isFormField()) {//目标文件File destFile = new File(folder, fileName);//文件已存在删除旧文件（上传了同名的文件）if (chunk == 0 && destFile.exists()) { destFile.delete(); destFile = new File(folder, fileName);}//合成文件
                appendFile(input, destFile); if (chunk == chunks - 1) { System.out.println("上传完成");}else {System.out.println("还剩["+(chunks-1-chunk)+"]个块文件");}   }}
}
private void appendFile(InputStream in, File destFile) {OutputStream out = null;try {// plupload 配置了chunk的时候新上传的文件append到文件末尾if (destFile.exists()) {out = new BufferedOutputStream(new FileOutputStream(destFile, true), BUFFER_SIZE);} else {out = new BufferedOutputStream(new FileOutputStream(destFile),BUFFER_SIZE);}in = new BufferedInputStream(in, BUFFER_SIZE);int len = 0;byte[] buffer = new byte[BUFFER_SIZE];         while ((len = in.read(buffer)) > 0) {out.write(buffer, 0, len);}} catch (Exception e) {} finally {    try {if (null != in) {in.close();}if(null != out){out.close();}} catch (IOException e) {}}}