private JTree jtNetDevice;//数组件申明

private JScrollPane jspTree;//滚动面板申明

1、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);

2、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();

  }

3、根据node得到path：

  TreePath visiblePath = new TreePath(getTreeModel().getPathToRoot(node));

4、根据Path展开到该节点

  jtNetDevice.makeVisible(visiblePath);

5、根据path设定该节点选定

  jtNetDevice.setSelectionPath(visiblePath);

6、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);

7、滚动到可见位置 

  jtNetDevice.scrollPathToVisible(visiblePath);

8、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

    }

  }

9、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);

       }

   }

10、如何遍历JTree 

   // 创建树

   JTree tree = new JTree();

   

   // 添加树节点......

   

   // 遍历所有节点

   visitAllNodes(tree);

   

   // 仅遍历展开的节点

   visitAllExpandedNodes(tree);

   

   // 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);

           }

       }

   }