给你一个例子:
class SimpleTreeFrame extends JFrame{
public SimpleTreeFrame(){
setTitle("SimpleTree");
setSize(300,200);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
}); DefaultMutableTreeNode root = new DefaultMutableTreeNode("World");
DefaultMutableTreeNode country = new DefaultMutableTreeNode("USA");
root.add(country);
DefaultMutableTreeNode state = new DefaultMutableTreeNode("California");
country.add(state);
DefaultMutableTreeNode city = new DefaultMutableTreeNode("San Jose");
state.add(city);
city = new DefaultMutableTreeNode("Cupertino");
state.add(city);
city = new DefaultMutableTreeNode("Michigan");
state.add(city);
city = new DefaultMutableTreeNode("Ann Arbor");
state.add(city);
country = new DefaultMutableTreeNode("Germany");
root.add(country);
state = new DefaultMutableTreeNode("Schleswig-Holstein");
country.add(state);
city = new DefaultMutableTreeNode("Kiel");
state.add(city); JTree tree = new JTree(root);
tree.putClientProperty("JTree.lineStyle","Angled");
Container contentPane = getContentPane();
contentPane.add(new JScrollPane(tree));
}
class SimpleTreeFrame extends JFrame{
public SimpleTreeFrame(){
setTitle("SimpleTree");
setSize(300,200);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
}); DefaultMutableTreeNode root = new DefaultMutableTreeNode("World");
DefaultMutableTreeNode country = new DefaultMutableTreeNode("USA");
root.add(country);
DefaultMutableTreeNode state = new DefaultMutableTreeNode("California");
country.add(state);
DefaultMutableTreeNode city = new DefaultMutableTreeNode("San Jose");
state.add(city);
city = new DefaultMutableTreeNode("Cupertino");
state.add(city);
city = new DefaultMutableTreeNode("Michigan");
state.add(city);
city = new DefaultMutableTreeNode("Ann Arbor");
state.add(city);
country = new DefaultMutableTreeNode("Germany");
root.add(country);
state = new DefaultMutableTreeNode("Schleswig-Holstein");
country.add(state);
city = new DefaultMutableTreeNode("Kiel");
state.add(city); JTree tree = new JTree(root);
tree.putClientProperty("JTree.lineStyle","Angled");
Container contentPane = getContentPane();
contentPane.add(new JScrollPane(tree));
}
ResultSetMetaData rsmd = rs.getMetaData();
int numberOfColumns = rsmd.getColumnCount();
int rowCount = 1;
while (rs.next()) {
DefaultMutableTreeNode(rs.getString(2));//Name字段
................//在这里要根据rs.getString(1)的值,即parentId的值 //tree上找到这个结点,然后作为子结点插入其中,查找要通过parentId而不是名字 ,因为parentId唯一。
rowCount++;
}
stmt.close();
con.close();
这个问题实际上是从数据库初始化jTree的问题。