用tomcat做Fileupload文件上传出现以下异常信息

页面抛出以下，异常信息，求解应该错在什么位置？An error occurred at line: 11 in the jsp file: /FileUploadDemo/fileupload_demo01.jsp
Factory cannot be resolved
8: <body>
9: <%
10:   DiskFileItemFactory factory=new DiskFileItemFactory();
11:   ServletFileUpload upload=new ServletFileUpload(Factory);
12:   upload.setFileSizeMax(3145728);
13:   List<FileItem> items=upload.parseRequest(request);
14:   Iterator<fileItem> iter=items.iterator();
An error occurred at line: 14 in the jsp file: /FileUploadDemo/fileupload_demo01.jsp
fileItem cannot be resolved to a type
11:   ServletFileUpload upload=new ServletFileUpload(Factory);
12:   upload.setFileSizeMax(3145728);
13:   List<FileItem> items=upload.parseRequest(request);
14:   Iterator<fileItem> iter=items.iterator();
15:   while(iter.hasNext()){
16:    FileItem item=iter.next();
17:    String filedName=item.getFieldName();
An error occurred at line: 19 in the jsp file: /FileUploadDemo/fileupload_demo01.jsp
fieldName cannot be resolved
16:    FileItem item=iter.next();
17:    String filedName=item.getFieldName();
18:    %>
19:    <ul><h4>表单控件名称：<%=fieldName%>--><%=item.isFormField()%></h4>
20:    <%
21:    if(!item.isFormField()){
22:    String fileName=item.getName();