<link rel="stylesheet" href="resources/css/plupload.css" type="text/css">
<script src="resources/js/jquery.min.js"></script>
<script src="resources/upload/plupload.full.min.js"></script>
<script src="resources/artDialog4.1.7/artDialog.source.js?skin=blue"></script>
<script src="resources/js/upload.js"></script>

$(function() {
  3   $('#uploadBtn').click(function() {
   popUpDialog();
  });
  _plupload('test','${pageContext.request.contextPath}/uploadfile');
 });

<a id="uploadBtn" class="optionbtn inline" href="#">文件上传</a>
 <!-- 触发弹出框 -->
 <div id="uploadContent" style="display: none; height: 300px; overflow-x: hidden; overflow-y: auto;">
  <div id="choosefile">
   <span>单个文件支持小于100M</span><br /> <a id="uploadify" href="javascript:void(0);">选择文件</a>
  </div>
  <div id="uploadfileQueue" style="border: 1px solid #a7c5e2; height: 228px; width: 350px;"></div>
 </div>
 <pre id="console"></pre>

/**
  * 文件上传请求地址
  * 
  * @param request
  * @param response
  */
 @RequestMapping("uploadfile")
 public void upload(HttpServletRequest request, HttpServletResponse response) {
  MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;// 二进制上传
  CommonsMultipartFile file = (CommonsMultipartFile) multipartRequest.getFile("file");// 获取文件
  String unid = UUID.randomUUID().toString().replace("-", "");/* 文件主键 */
  String originalFilename = file.getOriginalFilename();/* 原文件名，包括后缀 */
  String flieSize = String.valueOf(file.getSize());/* 文件大小 */
  String path = null;/* 文件存储路径 */
  String punid = request.getParameter("punid"); /* 关联文件punid */
  // 保存文件
  if (file != null) {
   try {
    String basePath = request.getSession().getServletContext().getRealPath("/uploadfile");
    SimpleDateFormat sdf = new SimpleDateFormat("/yyyy/MM/dd/");
    String subPath = sdf.format(new Date());
    path = basePath + subPath + unid + File.separator + originalFilename;
    // 如果文件夹不存在，就创建文件夹
    File dir = new File(path);
    if (!dir.exists()) {
     dir.mkdirs();
    }
    file.transferTo(dir);
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
  // 文件大小转换
  long kb = 1024;
  long mb = kb * 1024;
  long gb = mb * 1024;
  long size = Long.parseLong(flieSize);
  if (size >= gb) {
   flieSize = String.format("%.1f GB", (float) size / gb);
  } else if (size >= mb) {
   float f = (float) size / mb;
   flieSize = String.format(f > 100 ? "%.0f MB" : "%.1f MB", f);
  } else if (size >= kb) {
   float f = (float) size / kb;
   flieSize = String.format(f > 100 ? "%.0f KB" : "%.1f KB", f);
  } else {
   flieSize = String.format("%d B", size);
  }
  // 存储文件信息进数据库
  FileUpload fileUpload = new FileUpload();
  fileUpload.setUnid(unid);
  fileUpload.setOriginalFilename(originalFilename);
  fileUpload.setFlieSize(flieSize);
  fileUpload.setPath(path);
  fileUpload.setPunid(punid);
  SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  fileUpload.setFlieTime(df.format(new Date()));
  fileUploadService.insert(fileUpload);
 }

@RequestMapping("downloadfile")
 public void downLoadfile(HttpServletRequest request, HttpServletResponse response) {
  String unid = request.getParameter("unid");
  FileUpload fileUpload = fileUploadService.selectByPrimaryKey(unid);
  if (fileUpload != null) {
   try {
    String filename = new String(fileUpload.getOriginalFilename().getBytes("GBK"), "ISO-8859-1");
    String path = fileUpload.getPath();
    response.setCharacterEncoding("utf-8");
    response.setContentType("application/octet-stream");
    response.setHeader("Content-Disposition", "attachment;fileName=" + filename);
    response.setHeader("Content-Length", fileUpload.getFlieSize());
     InputStream inputStream = new FileInputStream(new
     File(path));
     OutputStream os = response.getOutputStream();
     byte[] b = new byte[2048];
     int length;
     while ((length = inputStream.read(b)) > 0) {
     os.write(b, 0, length);
     }
     os.close();
     inputStream.close();
   } catch (FileNotFoundException e) {
    e.printStackTrace();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
 }

/**
  * 文件删除
  * 
  * @param request
  * @param response
  */
 @ResponseBody
 @RequestMapping("delfile")
 public Map<String, Object> delfile(HttpServletRequest request, HttpServletResponse response) {
  String unid = request.getParameter("unid");
  FileUpload fileUpload = fileUploadService.selectByPrimaryKey(unid);
  // 删除本地
  boolean flag = false;
  File file = new File(fileUpload.getPath());
  if (file.exists()) {// 路径为文件且不为空则进行删除
   flag = file.delete();
  }
  // 删除数据库
  int result = fileUploadService.deleteByPrimaryKey(unid);
  if (result > 0) {
   flag = true;
  }
  Map<String, Object> map = new HashMap<String, Object>();
  map.put("result", flag);
  return map;
 }