目录选择的问题

 public void jButton1_actionPerformed(ActionEvent e) {
    try{
       dbConn = DriverManager.getConnection("jdbc:odbc:Driver={MicroSoft Access Driver (*.mdb)};DBQ=./db.mdb","","");
      if(jRadioButton1.isSelected())
      {        String path=jTextField1.getText();        String strDataBaseFilePath = "db.mdb";
   //     System.out.println(strDataBaseFilePath);   
        
        try {
     Process process = Runtime.getRuntime().exec("cmd.exe /c start  copy   ./db.mdb     " +path);
  //    System.out.print("cmd.exe /c start  copy   db.mdb     " +path);
        }
        catch (Exception exx) {
          System.out.println(exx);
        }     
      }
      else
      {
        JOptionPane.showMessageDialog(this, "请选择备份范围", "消息!",
                                      JOptionPane.INFORMATION_MESSAGE);
       }
    }
   catch(Exception ex)
   {
     ex.printStackTrace();
   }
  }  public void jButton2_actionPerformed(ActionEvent e) {
    this.setVisible(false);
  }  public void jButton3_actionPerformed(ActionEvent e) {
    JFileChooser fc = new JFileChooser();
    fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
    if (JFileChooser.APPROVE_OPTION == fc.showOpenDialog(null)) {
      System.out.println(fc.getSelectedFile());
    }
    
    jTextField1.setText(fc.getSelectedFile()+"");
  }
}结果是拷贝了./db.mdb 下同目录的所有文件 改成db.mdb 又找不到路径了  怎么弄啊