[Servlet]Upload File e relativo inserimento in un Db

[mauc]

io avevo fatto alcune ricerche e avevo trovato un codice per l'upload e inserimento nel Db del file, l'ho modificato per come serviva a me e questo è il risultato

 try {
            // Apache Commons-Fileupload library classes
            DiskFileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload upload  = new ServletFileUpload(factory);

            if (! ServletFileUpload.isMultipartContent(request)) {
                System.out.println("sorry. No file uploaded");
                return;
            }
            String user = request.getParameter("user");
            List items = upload.parseRequest(request);
            
            FileItem nome = (FileItem) items.get(0);
            String nomeD = nome.getString();
            
            FileItem username = (FileItem) items.get(1);
            String userN = username.getString();        
            
            FileItem file = (FileItem) items.get(2);
            
            String lavoro ="no";
            
            Class.forName("com.mysql.jdbc.Driver");
            String connectionUrl = "jdbc:mysql://localhost/test?" + "user=root&password=";
            Connection con = DriverManager.getConnection(connectionUrl);
            con.setAutoCommit(false);
            
            PreparedStatement ps = con.prepareStatement("INSERT INTO '"+user+"' VALUES (?,?,?) ");
            ps.setString(1, nomeD);
            ps.setString(2, "no");
            ps.setBinaryStream(3, file.getInputStream(), (int) file.getSize());
            ps.executeUpdate();
            con.commit(); 

purtroppo come risultato ho questo errore

ERRORE SE UPPO UNA FOTO
SQLException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''null' VALUES ('Prova','no',_binary'Ã�Ã�à ¡±á\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0' at line 1 

ERRORE SE UPPO UN TXT
SQLException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''null' VALUES ('Prova','no',_binary'')' at line 1