JTable界面的即时刷新

   用JTable显示数据库中的数据是非常方便的，但有个问题是如果更新数据的话，界面上的数据依旧没有变需要重启(从数据库中取得新数据)才能显示更新后的数据。我从网上找了很多资料但都不成功，最后自已实现了一部分（说一部分成功是因为删除数据能即时更新但添加数据仍需重启，但我这里采用了一个刷新按钮来实现重新从数据库读取数据！）

下面是我做的通讯录的两个重要类，有关于界面刷新的重要部分红色显示！

public class DBManager extends AbstractTableModel{

private Connection conn = null;
private Statement stmt = null;
private ResultSet rs = null;
private Vector<Vector<String>> rows = new Vector<Vector<String>>();
private final String[] columnNames = {"姓名","性别","住址","QQ","Email","家庭电话","手机","出生日期"};

public DBManager() {
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
conn=DriverManager.getConnection("jdbc:odbc:address_book", "","");
stmt=conn.createStatement();
query("select * from person");
   }
catch(SQLException e){ System.out.println(e.getMessage()); }
catch(Exception ex){ System.out.println("createError:"+ex.getMessage());}
}
public void query(String sql)
{
try{
rs=stmt.executeQuery(sql);
            while (rs.next()) {
                Vector<String> newRow = new Vector<String>();
                for (int i = 1; i <= getColumnCount(); i++) {
                newRow.addElement((String)rs.getObject(i+1));
                }newRow.addElement(rs.getObject(1).toString());
                rows.addElement(newRow);
              }
            fireTableChanged(null); // Tell the listeners a new table has arrived.
}
catch(SQLException e){System.out.println("executeQuery:"+e.getMessage());}

}
public void executeUpdate(String sql)
{
try{
//执行操作数据库SQL语句的方法，如插入、删除、更新记录
stmt.executeUpdate(sql);
}catch(SQLException e){ System.out.println("excecuteUpdate:"+e.getMessage());}
}
//关闭resultset、statement和connection
public void close() 
{
  try{
if(rs!=null) rs.close();
if(stmt!=null) stmt.close();
if(conn!=null) conn.close();
  }catch(SQLException e){ System.err.println(e.getMessage());}
}

    //////////////////////////////////////////////////////////////////////////
    //
    //             Implementation of the TableModel Interface
    //
    //////////////////////////////////////////////////////////////////////////


public String getColumnName(int column) {
    if (columnNames[column] != null) {
          return columnNames[column];
       }else {
          return "";
     }
}

    public Class getColumnClass(int column) {
    //return getValueAt(0, column).getClass();    
    return String.class;
    }

    public boolean isCellEditable(int row, int column) {
      return true;
    }

    public int getColumnCount() {
        return columnNames.length;
    }

    public int getRowCount() {
        return rows.size();
    }
    public void empty(){   
    rows.setSize(0);
        fireTableDataChanged();
    }


    public Object getValueAt(int aRow, int aColumn) {
        Vector<String> row = (Vector<String>)rows.elementAt(aRow);
        return row.elementAt(aColumn);
    }

    public void setValueAt(Object value, int row, int column) {  
    String names[]={"name","gender","address","QQ","email","phone","tellphone","brithday"};//对应数据表中的字断列
    String id=getId(row);
    Vector dataRow = (Vector)rows.elementAt(row);
        dataRow.setElementAt(value, column);   
        String query ="update person set "+names[column]+"='"+getValueAt(row,column)+ "' where id="+id;          
        //System.out.println(query);
        executeUpdate(query);                 
    }
    public String getId(int row){
    String names[]={"name","gender","address","QQ","email","phone","tellphone","brithday"};//对应数据表中的字断列
    Vector dataRow = (Vector)rows.elementAt(row);
    String id=(String)dataRow.elementAt(names.length);//取对该行的ID号
    return id;
    }

}


public class MainFrame extends JFrame implements ActionListener, MouseListener{
   
     DBManager db=new DBManager();
     JTextField queryText=new JTextField("请在此输入要查询姓名");
     JButton bt_query=new JButton("查询");
     JButton bt_add= new JButton("添加");
     JButton bt_return=new JButton("刷新");
     JButton bt_delete=new JButton("删除");
     JTable tableView = new JTable();
public MainFrame() {
        super("通讯录");               
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设定关闭窗体时退出程序
        ////////////////以下的程序是设置JTable的内容/////////////////////
        tableView.setModel(db);
        tableView.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        setTool();
       

        JScrollPane scrollpane = new JScrollPane(tableView);
        scrollpane.setBorder(new BevelBorder(BevelBorder.LOWERED));
        scrollpane.setPreferredSize(new Dimension(605, 500));
        ////////////////////////////////////////////////
        JPanel top=new JPanel();
        top.add(queryText);
        top.add(bt_query);
        JPanel bottom=new JPanel();
        bottom.add(bt_add);
        bottom.add(bt_return);
        bottom.add(bt_delete);
       
        JPanel pane=new JPanel();
pane.setLayout(new BorderLayout());
pane.add(top,BorderLayout.NORTH);
pane.add(scrollpane,BorderLayout.CENTER);
pane.add(bottom,BorderLayout.SOUTH);
//////////////////////////////////////////////////
bt_delete.addActionListener(this);
bt_add.addActionListener(this);
bt_query.addActionListener(this);
        bt_return.addActionListener(this);
        queryText.addMouseListener(this);
               
        getContentPane().add(pane);
        pack();
        setVisible(true); setResizable(false);
        setLocationRelativeTo(null);//设置位置居屏幕中央
    }
public void setTool(){
JComboBox comboBox = new JComboBox();
        comboBox.addItem("男");
        comboBox.addItem("女");

        TableColumn colorColumn = tableView.getColumn("性别");
        colorColumn.setCellEditor(new DefaultCellEditor(comboBox));

        DefaultTableCellRenderer colorColumnRenderer = new DefaultTableCellRenderer();
        colorColumnRenderer.setBackground(Color.pink);
        colorColumnRenderer.setToolTipText("Click for combo box");
        colorColumn.setCellRenderer(colorColumnRenderer);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==bt_delete){
int i=tableView.getSelectedRow();
if(i>=0){
String id=db.getId(i);
    db.executeUpdate("delete * from person where id="+id);    
}
db.empty();
     db.query("select * from person");setTool();
}
else if(e.getSource()==bt_add){
NewPerson np=new NewPerson();
np.setVisible(true);
}
else if(e.getSource()==bt_query){
db.empty();
String a=queryText.getText();
db.query("select * from person where name like'%"+a+"%'");setTool(); }
else if(e.getSource()==bt_return){
db.empty();
db.query("select * from person");
setTool(); }
}
public void mousePressed(MouseEvent e){}
public void mouseReleased(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mouseClicked(MouseEvent e){queryText.setText("");}

public static void main(String[] args) {
        new MainFrame();
    }

}