有一组树形结构的数据，即它有若干个大类，每个大类中有若干个中类，每个中类中有若干个小类，每个小类中可能又有若干个项目......。我想逐层展开它。
每一个大类的左侧显示一个加号，当鼠标点击加号时，便展开其下一层数据（即中类），当中类下面还有更深一层数据（即小类）时，便在该中类左侧显示一个加号，可以接受鼠标选择；若已全部展开则显示一个减号。
想到了treeviews来做，但是没有思路，大神能否给个思路，有例子更好。
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没做过 百度试试吧
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SWT中TREE用起来很繁杂，很不好用，感觉不好。
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你什么时候有时间？我现在没时间，我可以给你列子，身边没有参考资料？
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- Java code
import java.awt.EventQueue;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JTextField;import javax.swing.JTree;import javax.swing.SpringLayout;import javax.swing.tree.DefaultMutableTreeNode;import javax.swing.tree.DefaultTreeModel;import javax.swing.tree.TreePath;public class myTreeTest extends JFrame { private JTextField textField; private JTree tree; private SpringLayout springLayout; /** * Launch the application * @param args */ public static void main(String args[]) { EventQueue.invokeLater(new Runnable() { public void run() { try { myTreeTest frame = new myTreeTest(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame */ public myTreeTest() { super(); setTitle("维护企业架构"); springLayout = new SpringLayout(); getContentPane().setLayout(springLayout); setBounds(100, 100, 313, 485); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); tree = new JTree(); getContentPane().add(tree); springLayout.putConstraint(SpringLayout.SOUTH, tree, 310, SpringLayout.NORTH, getContentPane()); springLayout.putConstraint(SpringLayout.NORTH, tree, 25, SpringLayout.NORTH, getContentPane()); springLayout.putConstraint(SpringLayout.EAST, tree, 255, SpringLayout.WEST, getContentPane()); springLayout.putConstraint(SpringLayout.WEST, tree, 50, SpringLayout.WEST, getContentPane()); final JLabel label = new JLabel(); label.setText("名称："); getContentPane().add(label); springLayout.putConstraint(SpringLayout.WEST, label, 5, SpringLayout.WEST, getContentPane()); textField = new JTextField(); getContentPane().add(textField); springLayout.putConstraint(SpringLayout.NORTH, textField, 375, SpringLayout.NORTH, getContentPane()); final JButton btnadd = new JButton(); btnadd.setText("添加"); btnadd.addActionListener(new ActionListener(){ @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub DefaultMutableTreeNode addnode=new DefaultMutableTreeNode(textField.getText()); TreePath selpath=tree.getSelectionPath(); DefaultMutableTreeNode parentnode=(DefaultMutableTreeNode) selpath.getLastPathComponent(); DefaultTreeModel treeModel=new DefaultTreeModel(addnode); treeModel.insertNodeInto(addnode, parentnode, parentnode.getChildCount()); TreePath path=selpath.pathByAddingChild(addnode); if(!tree.isVisible(path)){ tree.makeVisible(path); } } }); getContentPane().add(btnadd); springLayout.putConstraint(SpringLayout.EAST, btnadd, 260, SpringLayout.WEST, getContentPane()); springLayout.putConstraint(SpringLayout.WEST, btnadd, 190, SpringLayout.WEST, getContentPane()); springLayout.putConstraint(SpringLayout.SOUTH, btnadd, 355, SpringLayout.NORTH, getContentPane()); final JButton btndel = new JButton(); btndel.setText("删除"); btndel.addActionListener(new ActionListener(){ @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub DefaultMutableTreeNode delnode=(DefaultMutableTreeNode) tree.getLastSelectedPathComponent();//选中欲删除的节点 if(!delnode.isRoot()){ DefaultMutableTreeNode nextselnode=delnode.getNextSibling(); if(nextselnode==null){ nextselnode=(DefaultMutableTreeNode) delnode.getParent(); } DefaultTreeModel deltreeModel=new DefaultTreeModel(delnode); deltreeModel.removeNodeFromParent(delnode); tree.setSelectionPath(new TreePath(nextselnode.getPath())); } } }); getContentPane().add(btndel); springLayout.putConstraint(SpringLayout.EAST, textField, -5, SpringLayout.WEST, btndel); springLayout.putConstraint(SpringLayout.WEST, textField, 5, SpringLayout.EAST, label); springLayout.putConstraint(SpringLayout.SOUTH, label, 0, SpringLayout.SOUTH, btndel); springLayout.putConstraint(SpringLayout.EAST, btndel, 0, SpringLayout.EAST, btnadd); springLayout.putConstraint(SpringLayout.WEST, btndel, 0, SpringLayout.WEST, btnadd); springLayout.putConstraint(SpringLayout.SOUTH, btndel, 395, SpringLayout.NORTH, getContentPane()); final JButton btnup = new JButton(); btnup.setText("修改"); btnup.addActionListener(new ActionListener(){ @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub TreePath selpath=tree.getSelectionPath(); DefaultMutableTreeNode upnode=(DefaultMutableTreeNode) selpath.getLastPathComponent(); upnode.setUserObject(textField.getText()); DefaultTreeModel uptreeModel=new DefaultTreeModel(upnode); uptreeModel.nodeChanged(upnode); tree.setSelectionPath(selpath); } }); getContentPane().add(btnup); springLayout.putConstraint(SpringLayout.EAST, btnup, 75, SpringLayout.EAST, textField); springLayout.putConstraint(SpringLayout.WEST, btnup, 5, SpringLayout.EAST, textField); springLayout.putConstraint(SpringLayout.NORTH, btnup, 405, SpringLayout.NORTH, getContentPane()); // }}