1.要求:任意给一颗树,要求在jsp页面中用表格的形式显示出这个树的关系,并可以进行添加,删除,修改。
给定了一个类:
public class Node{ private String title;//显示标签;
private String id;//节点id;
private String upid;//上级节点id
}
//在 类中实现,不能再定义其他关于树的属性;
给定了一个类:
public class Node{ private String title;//显示标签;
private String id;//节点id;
private String upid;//上级节点id
}
//在 类中实现,不能再定义其他关于树的属性;
不是要一个private Node node吗
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JMenuItem;import javax.swing.JPopupMenu;import javax.swing.JScrollPane;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 Test extends JFrame implements MouseListener,ActionListener {
JTree tree; JPopupMenu popMenu; JMenuItem addItem;
JMenuItem delItem;
JMenuItem editItem; public Test() {
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);
getContentPane().add(new JScrollPane(tree));
} 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) {
Test frame = new Test();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}