access数据库备份问题

我从网上下了一用java写的源程序，里面有数据库备份的功能，可以当我运行时，提示java.ioException:系统找不指定的路径。主要代码如下void jButton1_actionPerformed(ActionEvent e) { File fBak = new File(".\\bak\\db.bak");File fDb = new File(".\\data\\Family.mdb");FileInputStream fin= null;FileOutputStream fout = null;try{ if(!fBak.exists()) fBak.createNewFile();fin=new FileInputStream(fDb);fout = new FileOutputStream(fBak);int r;while((r = fin.read()) != -1){ fout.write((byte)r);} JOptionPane.showMessageDialog(this,"备份成功！","提示",JOptionPane.INFORMATION_MESSAGE);}catch(Exception ex) { JOptionPane.showMessageDialog(this,ex.toString(),"提示",JOptionPane.ERROR_MESSAGE);}finally { try{ if(fin!=null) fin.close();if(fout!=null) fout.close();} catch(Exception ex){} } } void jButton2_actionPerformed(ActionEvent e) { File fBak = new File(&quot 收起