java tree的 数据库读取?????

package csdn;import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;public class TestTree extends JFrame implements MouseListener, ActionListener
{ private static final long serialVersionUID = 1L; JTree tree; JPopupMenu popMenu; JMenuItem addItem;
JMenuItem delItem;
JMenuItem editItem; public TestTree()
{
tree = new JTree();
tree.setEditable(true);
tree.getSelectionModel().setSelectionMode(
TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.addMouseListener(this);
tree.setCellEditor(new DefaultTreeCellEditor(tree,
new DefaultTreeCellRenderer()));
getContentPane().add(tree);
setSize(200, 200); popMenu = new JPopupMenu();
addItem = new JMenuItem("添加");
addItem.addActionListener(this);
delItem = new JMenuItem("删除");
delItem.addActionListener(this);
editItem = new JMenuItem("修改");
editItem.addActionListener(this); popMenu.add(addItem);
popMenu.add(delItem);
popMenu.add(editItem);
} public void mouseClicked(MouseEvent e)
{ } public void mouseEntered(MouseEvent e)
{ } public void mouseExited(MouseEvent e)
{ } public void mousePressed(MouseEvent e)
{
TreePath path = tree.getPathForLocation(e.getX(), e.getY()); // 关键是这个方法的使用
if (path == null)
{
return;
}
tree.setSelectionPath(path); if (e.getButton() == 3)
{
popMenu.show(tree, e.getX(), e.getY());
}
} public void mouseReleased(MouseEvent e)
{ } public void actionPerformed(ActionEvent e)
{
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree
.getLastSelectedPathComponent();
if (e.getSource() == addItem)
{
((DefaultTreeModel) tree.getModel()).insertNodeInto(
new DefaultMutableTreeNode("Test"), node, node
.getChildCount());
tree.expandPath(tree.getSelectionPath());
}
else if (e.getSource() == delItem)
{
if (node.isRoot())
{
return;
}
((DefaultTreeModel) tree.getModel()).removeNodeFromParent(node);
}
else if (e.getSource() == editItem)
{
tree.startEditingAtPath(tree.getSelectionPath());
}
} public static void main(String[] args)
{
TestTree frame = new TestTree();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
没有连接数据库，楼主可以试着在需要的地方添加数据库