JTree使用经验总结学习随笔images/icons/3.gif private JTree jtNetDevice;//数组件申明 private JScrollPane jspTree;//滚动面板申明 // 初始化 DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("root"); jtNetDevice = new JTree(rootNode); jtNetDevice.setAutoscrolls(true); getTreeSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SelectION);//设置单选模式 jspTree = new JScrollPane(); jspTree.getViewport().add(jtNetDevice, null); // 三个经常使用的取值函数 private DefaultTreeModel getTreeModel(){ return (DefaultTreeModel)jtNetDevice.getModel(); } private DefaultMutableTreeNode getRootNode(){ return (DefaultMutableTreeNode)getTreeModel().getRoot(); } private TreeSelectionModel getTreeSelectionModel(){ return jtNetDevice.getSelectionModel(); } // 根据node得到path： TreePath visiblePath = new TreePath(getTreeModel().getPathToRoot(node)); // 根据Path展开到该节点 jtNetDevice.makeVisible(visiblePath); // 根据path设定该节点选定 jtNetDevice.setSelectionPath(visiblePath); // 选中节点的方法 // 首先，根据节点得到树路径，其中chosen为需要选中的节点 TreePath visiblePath = new TreePath(((DefaultTreeModel)jtNetDevice.getModel()).getPathToRoot(chosen)); // 然后根据Path选中该节点 jtNetDevice.setSelectionPath(visiblePath); // 滚动到可见位置 jtNetDevice.scrollPathToVisible(visiblePath); // 给JTree添加右键弹出菜单 void jtNetDevice_mouseReleased(MouseEvent e) { if (e.isPopupTrigger()) { jPopupMenu1.show(e.getComponent(), e.getX(), e.getY());//弹出右键菜单 } } // 关于JTree的展开 // If expand is true, expands all nodes in the tree. // Otherwise, collapses all nodes in the tree. public void expandAll(JTree tree, boolean expand) { TreeNode root = (TreeNode)tree.getModel().getRoot(); // Traverse tree from root expandAll(tree, new TreePath(root), expand); } private void expandAll(JTree tree, TreePath parent, boolean expand) { // Traverse children TreeNode node = (TreeNode)parent.getLastPathComponent(); if (node.getChildCount() >= 0) { for (Enumeration e=node.children(); e.hasMoreElements(); ) { TreeNode n = (TreeNode)e.nextElement(); TreePath path = parent.pathByAddingChild(n); expandAll(tree, path, expand); } } // Expansion or collapse must be done bottom-up if (expand) { tree.expandPath(parent); } else { tree.collapsePath(parent); } } // 如何遍历JTree // 创建树 JTree tree = new JTree(); // 添加树节点...... // ... visitAllNodes(tree); // 遍历所有节点 visitAllExpandedNodes(tree); // 仅遍历展开的节点 // Traverse all nodes in tree public void visitAllNodes(JTree tree) { TreeNode root = (TreeNode)tree.getModel().getRoot(); visitAllNodes(root); } public void visitAllNodes(TreeNode node) { // node is visited exactly once process(node); if (node.getChildCount() >= 0) { for (Enumeration e=node.children(); e.hasMoreElements(); ) { TreeNode n = (TreeNode)e.nextElement(); visitAllNodes(n); } } } // Traverse all expanded nodes in tree public void visitAllExpandedNodes(JTree tree) { TreeNode root = (TreeNode)tree.getModel().getRoot(); visitAllExpandedNodes(tree, new TreePath(root)); } public void visitAllExpandedNodes(JTree tree, TreePath parent) { // Return if node is not expanded if (!tree.isVisible(parent)) return; // node is visible and is visited exactly once TreeNode node = (TreeNode)parent.getLastPathComponent(); process(node); // Visit all children if (node.getChildCount() >= 0) { for (Enumeration e=node.children(); e.hasMoreElements(); ) { TreeNode n = (TreeNode)e.nextElement(); TreePath path = parent.pathByAddingChild(n); visitAllExpandedNodes(tree, path); } } } ]]>2007-10-11 23:41:592008-07-06 13:30:0004421