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先简单的粘贴下代码，正在学习java的东西，正好用到swing，算是做个练习。API太多，还没有梳理太清楚，慢慢回顾。

public class TreeFrame extends JFrame {
       public static final int WIDTH = 1100;    public static final int HEIGHT = 615;    private static int xlocation ,ylocation;    private boolean xmlFlag = false;    private JPanel treeArea = new JPanel();    private JPanel buttons = new JPanel();    DefaultMutableTreeNode top = new DefaultMutableTreeNode("行政规划");    private JTree menuTree = new JTree(top);    private JTextArea text = new JTextArea();    DefaultTreeModel model;    FileOutputStream fos;    OutputStreamWriter osw;    public TreeFrame(){        this.setTitle("省份名称");        this.setSize(WIDTH, HEIGHT);        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();        xlocation = (screenSize.width-WIDTH)/2;        ylocation = (screenSize.height-HEIGHT)/2;        this.setLocation(xlocation, ylocation);        //设置关闭窗口        this.addWindowListener(new WindowListener() {            @Override            public void windowOpened(WindowEvent e) {                // TODO Auto-generated method stub            }            @Override            public void windowIconified(WindowEvent e) {                // TODO Auto-generated method stub            }            @Override            public void windowDeiconified(WindowEvent e) {                // TODO Auto-generated method stub            }            @Override            public void windowDeactivated(WindowEvent e) {                // TODO Auto-generated method stub            }            @Override            public void windowClosing(WindowEvent e) {                try {                    fos=new FileOutputStream("xml/data.xml");                    osw=new OutputStreamWriter(fos,"utf-8");                                        osw.write("
   "+"\r\n");                    model = (DefaultTreeModel)menuTree.getModel();                    DefaultMutableTreeNode root = (DefaultMutableTreeNode)model.getRoot();                    //头结点行政规划不用保存                    saveToFile(root.getNextNode(), osw);                    osw.close();                    fos.close();                } catch (IOException error) {                                       error.printStackTrace();                }                System.exit(0);            }            @Override            public void windowClosed(WindowEvent e) {                // TODO Auto-generated method stub            }            @Override            public void windowActivated(WindowEvent e) {                // TODO Auto-generated method stub            }        });        Container container = this.getContentPane();        initTreeJPanel();        inintButtonJpanel();        JSplitPane mainFrameSplit = new JSplitPane();        mainFrameSplit.setEnabled(false);        mainFrameSplit.setLeftComponent(treeArea);        mainFrameSplit.setRightComponent(text);        treeArea.add(buttons,BorderLayout.SOUTH);        container.add(mainFrameSplit);        this.setMenuBar(getMenuBar());    }    /**     * 初始化按键区域     */    public void inintButtonJpanel(){        model = (DefaultTreeModel)menuTree.getModel();        JButton addSiblingButton = new JButton("添加兄弟结点");        JButton addChildButton = new JButton("添加孩子结点");        JButton deleteSelectedButton = new JButton("删除选中结点");        JButton editSelectedButton = new JButton("编辑选中结点");        buttons.add(addChildButton);        buttons.add(addSiblingButton);        buttons.add(deleteSelectedButton);        buttons.add(editSelectedButton);        //添加编辑结点的监听        editSelectedButton.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                TreePath selectedPath = menuTree.getSelectionPath();                if(selectedPath!=null){                    menuTree.startEditingAtPath(selectedPath);                }                text.append("编辑结点："+selectedPath+"\n");            }        });        //添加删除结点的监听        deleteSelectedButton.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                TreePath selectedPath = menuTree.getSelectionPath();                DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)menuTree.getLastSelectedPathComponent();                if (selectedNode!=null && selectedNode.getParent()!=null) {                    model.removeNodeFromParent(selectedNode);                }                text.append("删除了一个结点："+selectedPath+"\n");            }        });        //添加孩子结点的监听        addChildButton.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)menuTree.getLastSelectedPathComponent();                if (selectedNode == null) {                    return;                }                DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("新结点");                selectedNode.add(newNode);                TreeNode []nodes = model.getPathToRoot(newNode);                TreePath path = new TreePath(nodes);                menuTree.scrollPathToVisible(path);                menuTree.updateUI();                text.append("添加了一个结点："+path+"\n");            }        });        //添加兄弟节点结点的监听        addSiblingButton.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)menuTree.getLastSelectedPathComponent();                if (selectedNode == null) {                    return;                }                DefaultMutableTreeNode parent = (DefaultMutableTreeNode)selectedNode.getParent();                if (parent == null) {                    return;                }                DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("新结点");                int selectedIndex = parent.getIndex(selectedNode);                model.insertNodeInto(newNode, parent, selectedIndex + 1);                TreeNode []nodes = model.getPathToRoot(newNode);                TreePath path = new TreePath(nodes);                menuTree.scrollPathToVisible(path);                text.append("添加了一个结点："+path+"\n");            }        });    }    /**     * 初始化树形结构     */    public void initTreeJPanel(){        menuTree.setEditable(true);        treeArea.setLayout(new BorderLayout());        int mainBorderWidth = getWidth();        int mainBorderHeight = getHeight();        treeArea.setPreferredSize(new Dimension(mainBorderWidth/4,mainBorderHeight) );        menuTree.setShowsRootHandles(true);        initTreeParam();        JScrollPane jScrollTree = new JScrollPane();        jScrollTree.getViewport().add(menuTree, 1);        treeArea.add(jScrollTree,BorderLayout.CENTER);    }    /**     * 初始化树形结构数据     */    public void initTreeParam(){        DefaultMutableTreeNode rootnode = (DefaultMutableTreeNode)menuTree.getModel().getRoot();        rootnode.removeAllChildren();        xmlFlag = xmlParser("xml/data.xml", top);        if(!xmlFlag){            return;        }else {            TreeNode root = (TreeNode)menuTree.getModel().getRoot();            expandNode(menuTree,new TreePath(root),true,false);        }    }    /**     * 展开节点，好像有也可以     * @param tree     * @param parent     * @param expand     * @param expandChildren     */    private void expandNode(JTree tree,TreePath parent,boolean expand,boolean expandChildren){        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);                if (expandChildren) {                    expandNode(tree, path, expand, expandChildren);                }            }        }        if (expand) {            tree.expandPath(parent);        }else {            tree.collapsePath(parent);        }    }    /**     * 将xml结点添加到swing树形结构     * @param path xml路径     * @param top swing树形结构的头结点     * @return     */    private boolean xmlParser(String path,DefaultMutableTreeNode top){        File file = new File(path);        DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance();        try {            DocumentBuilder dombuilder = domfac.newDocumentBuilder();            Document doc = dombuilder.parse(new FileInputStream(file));            Element root = doc.getDocumentElement();            String name = root.getAttribute("name");            DefaultMutableTreeNode newnode = new DefaultMutableTreeNode(name);            top.add(newnode);            if (!Recurrence(root,newnode)) {            }        } catch (ParserConfigurationException e) {            e.printStackTrace();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (SAXException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return true;    }    /**     * 遍历xml所有结点     * @param node xml结点     * @param top swing树形结构结点     * @return     */    private boolean Recurrence(Node node,DefaultMutableTreeNode top){        List
   
     list = getElementNode(node);        DefaultMutableTreeNode snode= null;        if (list.size()==0) {        } else {            for(Node n : list){                NamedNodeMap nGetAttributes = n.getAttributes();                String name = nGetAttributes.getNamedItem("name").getNodeValue();                snode = new DefaultMutableTreeNode(name);                top.add(snode);                if (!Recurrence(n, snode)) {                    return false;                }            }        }        return true;    }    /**     * 找到xml结点的子节点     * @param node xml结点     * @return     */    private List
    
      getElementNode(Node node){        List
     
       list = new LinkedList
      
       ();        for (Node n = node.getFirstChild();n!=null;n=n.getNextSibling()) {            if (n.getNodeType()==Node.ELEMENT_NODE) {                list.add(n);            }        }        return list;    }    /**     * 将树形结构保存到xml文件中     * @param root 根节点     * @param fw 输出流     */    public void saveToFile(DefaultMutableTreeNode root, OutputStreamWriter osw){        try {            osw.write("
       
        \r\n");            for (int i=0; i < root.getChildCount(); i++){                DefaultMutableTreeNode childNode =(DefaultMutableTreeNode)root.getChildAt(i);                saveToFile(childNode, osw);            }            osw.write("
       \r\n");       }catch (Exception e){        e.printStackTrace();      }     }    public static void main(String[] args) {        TreeFrame mainFrame = new TreeFrame();        mainFrame.setResizable(false);        mainFrame.setVisible(true);    }}
      
     
    
   

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