Use servlet to upload images in jsp

The code is as follows:

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First, the following components are required in JSP: <H2 class = "h2"> Upload photo: </H2> <Form action = "pic. do" method = "post" Enctype = "multipart/form-data"> <Input type = "file" name = "file1"/> <Input type = "submit" value = "upload"/> </Form> Then, you can use the following code in the servlet to upload files: If (path. equals ("/pic ")){ // Obtain the login user id, used to create a new folder and store the file s uploaded by the user HttpSession session = request. getSession (); User user = (User) session. getAttribute ("user "); Long id = user. getId ();     DiskFileItemFactory factory = new DiskFileItemFactory (); ServletFileUpload sfu = new ServletFileUpload (factory ); Try { List <FileItem> items = sfu. parseRequest (request ); For (int I = 0; I <items. size (); I ++ ){ FileItem item = items. get (I ); If (item. isFormField ()){ String name = item. getString (); System. out. println ("name" + name );       } Else { ServletContext context = getServletContext (); Path = context. getRealPath ("upload "); File file = new File (path + "\ pic _" + id ); File. mkdir ();        String fileName1 = item. getName (); String fileName = fileName1.substring (fileName1.lastIndexOf ("\") + 1 ); File = new File (path + "\" + "pic _" + id + "\" + fileName );        Item. write (file );       }      } } Catch (Exception e ){ // TODO Auto-generated catch block E. printStackTrace ();     }        }