servlet代码：（apache组件实现）

public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
    
  request.setCharacterEncoding("utf-8");
  boolean isMultipart = ServletFileUpload.isMultipartContent(request);
  if (!isMultipart) {
   return;
  }
  try {
   DiskFileItemFactory factory = new DiskFileItemFactory();
   factory.setSizeThreshold(4096);
   factory.setRepository(new File(tempPath));
   // Create a new file upload handler
   ServletFileUpload upload = new ServletFileUpload(factory);
   // Set overall request size constraint
   upload.setSizeMax(1263509131 * 1024);
   List items = upload.parseRequest(request);
   Iterator iter = items.iterator();
   while (iter.hasNext()) {
    FileItem item = (FileItem) iter.next();
    // 忽略其他不是文件域的所有表单信息
    if (!item.isFormField()) {
     name = item.getName();
     name = name.substring(name.lastIndexOf(File.separator) + 1,name.length());
     long size = item.getSize();
     if ((name == null || name.equals("")) && size == 0)
      continue;

     item.write(new File("G:/java工具/Tomcat免安装/tomcat/webapps/teleProject",uploadPath + name));// 这里的路径你可以改成你感兴趣的地方
     System.out.println(uploadPath + name);
     filename = name;
     
    }
   }
   //可以跳转成功页面

  } catch (Exception e) {
   // 可以跳转出错页面
   e.printStackTrace();
   
  }

}

今天写这个代码很郁闷，一直在List items = upload.parseRequest(request);这里出错；，后来通过大量的查找资料才知道不光要commons-fileupload包，还要commons-io包。