哪位SWING高手知道:jTree怎样动态的加入node?????????????????????

richzhang 2003-10-16 01:04:27
比如在JComboBox中选择一项,JTree对象中就在指定的位置加入一个node?
我用DefaultMutableTreeNode 好像只能在运行前加入?
谢谢指点?
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孙亖 2003-12-09
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good
pxboy 2003-10-17
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TreeNode parentNode = (TreeNode) (parentPath.getLastPathComponent());
你只要指定父节点就行了，这里是当前选择的节点

treeModel.insertNodeInto(newNode, parentNode, parentNode.getChildCount());
parentNode.getChildCount()是插入节点的位置
pxboy 2003-10-16
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DefaultTreeModel treeModel = (DefaultTreeModel)jTree.getModel();
TreeNode parentNode = (TreeNode) (parentPath.getLastPathComponent());
TreeNode newNode = new TreeNode("新节点");
treeModel.insertNodeInto(newNode, parentNode, parentNode.getChildCount());
swing界面设计之JTree
目录 目录 1 (一) Spring 开发 Swing GUI 简介——依赖注入和富客户机 5 关于本教程 5 前提条件 6 Spring 和依赖注入概述 7 什么是 Spring 框架？ 7 什么是依赖注入？ 7 环境设置 7 选择编译环境 7 设置 Ant 8 通过 Ant 自动下载依赖软件 10 设置 Maven 10 通过 Maven 自动下载依赖软件 12 设置 Eclipse 13 下载依赖的 JAR 文件并在 Eclipse 的 classpath 中定义这种依赖性 15 创建 to-do 列表：基本的 Swing 和 Spring 应用程序设置 17 创建 MainFrame、Launcher 和 ToDo 类 17 创建 Spring app-context.xml bean 定义文件 19 运行应用程序 20 定义 bean 属性 21 创建 to-do 列表：创建一个可重用组件并在表中显示数据 23 创建一个可重用的面板 23 将 bean 组合在一起 24 添加一个表并重用这个面板 26 定义表模型 28 显示列表中的项 29 创建 to-do 列表：完成 —— 按钮和监听程序 31 创建按钮和监听程序 32 组合按钮和监听程序 35 Spring Rich Client Project 37 Spring Rich Client Project 概述 37 结束语 38 (二) 适用于各类Swing应用的通用数据验证模块 39 项目创建好后，加入类库： 41 然后写一个persistence bean: 41 Java代码 41 我称这个类为HibernateValidationUI，代码如下： 43 Java代码 43 类中用到的Java2DIconFactory代码如下： 47 Java代码 47 Factory类 49 Java代码 49 最后，我们可以编写一个Demo application来看看效果如何，代码如下： 51 Java代码 51 总结： 55 (三) 对JTree从创建到使用详解 56 (四) JTree的使用方法 57 JTreeDemo.java源程序 57 经验汇总 60 1. 初始化 60 2. 三个经常使用的取值函数 60 3. 根据node得到path： 60 4. 根据Path展开到该节点 60 5. 根据path设定该节点选定 61 6. 选中节点的方法 61 7. 滚动到可见位置 61 8. 给JTree添加右键弹出菜单 61 9. 关于JTree的展开 61 10. 如何遍历JTree 62 (五) JTree右键菜单实现编辑、添加、删除节点 63 Test.java源代码 63 (六) 功能齐全的JTree例子 66 TreeEditTest.java源代码 66 (七) JTree控件的使用 70 构造函数： 70 TreeModel接口 70 DefaultTreeModel缺省版本 71 TreeNode接口 71 TreeExpansionListener接口 71 TreeCellRenderer 72 例子： 73 (八) 如何为JTree添加右键菜单？ 75 (九) 如何使JTextArea随着窗体的变化自动调整大小 76 TextAreaTest源代码 76 (十) JAVA swing编程JTree实现系统目录 77 FileTree1.java源代码 77 (十一) Java Swing中的JTree模型 85 Swing.tree包中的主要类名称实现 85 1. 构建树模型 86 2. 树结点 86 树结构详细类图 86 2.1 TreeNode接口 86 2.2 MutableTreeNode接口 87 2.3 DefaultMutableTreeNode类 88 3. 编辑树 88 3.1获得结点路径 88 3.2编辑结点 88 3.3视图显示 89 4. 查找树 89 5. 绘制结点 90 (十二) JTree鼠标左键的双击事件选用那个监听器 91 MouseDemo.java源代码 92 (十三) JTree 92 JTree的构造函数: 93 JTreeDefaultDemo.java源代码 93 (十四) JTree 应用 96 Frame1.java源代码 96 MyDefaultTreeCellRenderer.java源代码 98 (十五) JTree控件 100 树和节点的基本概念 100 有关树JTree的类和接口 100 代码实例：构建一棵树 101 相关语句解释 101 (十六) JTree应用示例——文件路径 103 AnimatedIconTreeExample.java源代码 103 //内部类NodeImageObserver.java源代码 105 //IconNodeRenderer.java源代码 106 //IconNode.java源代码 107 (十七) Swing 学习笔记 108 Swing API 包括18个公共包： 108 例程1.1 HelloWorldSwing.java 109 例程2.2 HelloWorldJFrame.java 110 (十八) 动态加载文件树的java程序 111 FileSystemTree.java源代码 112 //内部类 TreeWillExpandListenerImp.java 114 (十九) 向 Java 应用程序伸出援助之手——用 JavaHelp 2.0 构建下一个 Java 应用程序的帮助系统 115 入门 116 使用 HelpSet 117 HelpSet 数据文件 118 helpset 文件 118 maps 部分 119 view 部分 119 presentation 部分 120 implementation 部分 121 map 文件 121 导航文件 121 TOC 122 Index 122 Glossary 123 Favorites 123 主题文件 123 在 Java 应用程序中调用 JavaHelp 124 自定义外观 125 配置图标 125 基于文字的标签还是基于图像的标签？ 125 要工具栏还是不要工具栏？ 125 设置字体 126 使用展示窗口 127 标签 128 四种 activator 129 添加内容敏感的帮助 130 窗口级帮助 131 字段级帮助 131 屏幕级帮助 133 添加嵌入帮助 135 添加搜索功能 136 停用词 137 自定义停用词列表 137 合并 helpset 138 静态和动态合并 139 添加轻量级组件 141 基于服务器的帮助 144 设置 144 JavaHelp 服务器 bean 144 JavaScript 文件 145 JSP 文件 145 测试服务器端帮助 148 结束语 149
jtable增删改查和jtree连接
package BookTest; import java.awt.*; import java.awt.event.*; import java.util.AbstractQueue; import java.util.Vector; import javax.swing.*; import javax.swing.table.*; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeCellRenderer; import javax.swing.tree.DefaultTreeModel; import javax.swing.tree.TreeSelectionModel; import javax.swing.event.*; import javax.swing.table.TableColumnModel; //import DbHelp.OperatorJobs; import Dao.ArrayBook; public class Test extends JFrame { public JPanel jp=null; public String aa; //JTable jTable1 = new JTable(); public JTable jTable1=null; private JTree jTree1; DefaultTableModel mode; private JScrollPane scrollPane = null; DefaultMutableTreeNode node; JButton[] btn={new JButton("增加"),new JButton("删除"),new JButton("修改"),new JButton("查询"),new JButton("重置")}; public JTextField[] txt ={new JTextField(),new JTextField(),new JTextField(),new JTextField(),new JTextField(),new JTextField()}; public String[] str1={"1","summer","boy","20","",""}; public String[] str2={"2","wulei","girl","19","",""}; public String[] str3={"3","west","boy","20","",""}; public String[] str4={"4","fish","girl","18","",""}; public String[] str5={"5","youku","boy","21","",""}; public String[] str6={"6","aa","boy","21","",""}; public String[][] tempData1={str1,str2,str3,str4,str5,str6}; public String[] aa1={"1","summer","boy","20","123","123"}; public String[] aa2={"2","wulei","girl","19","123",""}; public String[] aa3={"3","west","boy","20","123",""}; public String[] aa4={"4","fish","girl","18","1",""}; public String[] aa5={"5","youku","boy","21","12",""}; public String[] aa6={"6","aa","boy","21","123",""}; public String[][] tempData4={aa1,aa2,aa3,aa4,aa5,aa6}; //设置表头数据 public String[] tempTitle={"ID","标题","内容","作者","时间","是否选中"}; //设置表格的数据集合 Vector v1=new Vector(); Vecto
swing文件拖拽
实现文件的拖拽功能 import java.awt.AlphaComposite; import java.awt.Component; import java.awt.Graphics2D; import java.awt.Point; import java.awt.Rectangle; import java.awt.Toolkit; import java.awt.datatransfer.DataFlavor; import java.awt.datatransfer.StringSelection; import java.awt.datatransfer.Transferable; import java.awt.datatransfer.UnsupportedFlavorException; import java.awt.dnd.DnDConstants; import java.awt.dnd.DragGestureEvent; import java.awt.dnd.DragGestureListener; import java.awt.dnd.DragSource; import java.awt.dnd.DragSourceDragEvent; import java.awt.dnd.DragSourceDropEvent; import java.awt.dnd.DragSourceEvent; import java.awt.dnd.DragSourceListener; import java.awt.dnd.DropTarget; import java.awt.dnd.DropTargetDragEvent; import java.awt.dnd.DropTargetDropEvent; import java.awt.dnd.DropTargetEvent; import java.awt.dnd.DropTargetListener; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.geom.AffineTransform; import java.awt.geom.Rectangle2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.Iterator; import java.util.List; import javax.swing.Icon; import javax.swing.JLabel; import javax.swing.JTree; import javax.swing.Timer; import javax.swing.event.TreeExpansionEvent; import javax.swing.event.TreeExpansionListener; import javax.swing.filechooser.FileSystemView; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeCellRenderer; import javax.swing.tree.DefaultTreeModel; import javax.swing.tree.TreePath; class DragTree extends JTree implements DragGestureListener, DragSourceListener, DropTargetListener { /** * */ private static final long serialVersionUID = 1L; BufferedImage ghostImage; private Rectangle2D ghostRect = new Rectangle2D.Float(); private Point ptOffset = new Point(); private Point lastPoint = new Point(); private TreePath lastPath; private Timer hoverTimer; FileNode sourceNode; public DragTree() { DragSource dragSource = DragSource.getDefaultDragSource(); dragSource.createDefaultDragGestureRecognizer(this, // component where // drag originates DnDConstants.ACTION_COPY_OR_MOVE, // actions this); // drag gesture recognizer setModel(createTreeModel()); addTreeExpansionListener(new TreeExpansionListener() { public void treeCollapsed(TreeExpansionEvent e) { } public void treeExpanded(TreeExpansionEvent e) { TreePath path = e.getPath(); if (path != null) { FileNode node = (FileNode) path.getLastPathComponent(); if (!node.isExplored()) { DefaultTreeModel model = (DefaultTreeModel) getModel(); node.explore(); model.nodeStructureChanged(node); } } } }); this.setCellRenderer(new DefaultTreeCellRenderer() { public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) { TreePath tp = tree.getPathForRow(row); if (tp != null) { FileNode node = (FileNode) tp.getLastPathComponent(); File f = node.getFile(); try { Icon icon = FileSystemView.getFileSystemView() .getSystemIcon(f); this.setIcon(icon); this.setLeafIcon(icon); this.setOpenIcon(icon); this.setClosedIcon(icon); this.setDisabledIcon(icon); } catch (Exception e) { e.printStackTrace(); } } return super.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus); } }); super.setScrollsOnExpand(true); new DropTarget(this, DnDConstants.ACTION_COPY_OR_MOVE, this); // Set up a hover timer, so that a node will be automatically expanded // or collapsed // if the user lingers on it for more than a short time hoverTimer = new Timer(1000, new ActionListener() { public void actionPerformed(ActionEvent e) { if (lastPath == null) { return; } if (getRowForPath(lastPath) == 0) return; // Do nothing if we are hovering over the root node if (isExpanded(lastPath)) collapsePath(lastPath); else expandPath(lastPath); } }); hoverTimer.setRepeats(false); // Set timer to one-shot mode this.addKeyListener(new KeyAdapter() { public void keyPressed(KeyEvent e) { int code = e.getKeyCode(); int modifiers = e.getModifiers(); if (code == 'v' || code == 'V') { System.out.println("find v"); System.out.println("modifiers:" + modifiers + "\t" + ((modifiers & KeyEvent.CTRL_MASK) != 0)); } if ((modifiers & KeyEvent.CTRL_MASK) != 0 && (code == 'v' || code == 'V')) { Transferable tr = Toolkit.getDefaultToolkit() .getSystemClipboard().getContents(null); TreePath path = getSelectionPath(); if (path == null) { return; } FileNode node = (FileNode) path.getLastPathComponent(); if (node.isDirectory()) { System.out.println("file cp"); try { List list = (List) (tr .getTransferData(DataFlavor.javaFileListFlavor)); Iterator iterator = list.iterator(); File parent = node.getFile(); while (iterator.hasNext()) { File f = (File) iterator.next(); cp(f, new File(parent, f.getName())); } node.reexplore(); } catch (Exception ioe) { ioe.printStackTrace(); } updateUI(); } } } }); } public void dragGestureRecognized(DragGestureEvent e) { // drag anything ... TreePath path = getLeadSelectionPath(); if (path == null) return; FileNode node = (FileNode) path.getLastPathComponent(); sourceNode = node; // Work out the offset of the drag point from the TreePath bounding // rectangle origin Rectangle raPath = getPathBounds(path); Point ptDragOrigin = e.getDragOrigin(); ptOffset.setLocation(ptDragOrigin.x - raPath.x, ptDragOrigin.y - raPath.y); // Get the cell renderer (which is a JLabel) for the path being dragged int row = this.getRowForLocation(ptDragOrigin.x, ptDragOrigin.y); JLabel lbl = (JLabel) getCellRenderer().getTreeCellRendererComponent( this, // tree path.getLastPathComponent(), // value false, // isSelected (dont want a colored background) isExpanded(path), // isExpanded getModel().isLeaf(path.getLastPathComponent()), // isLeaf row, // row (not important for rendering) false // hasFocus (dont want a focus rectangle) ); lbl.setSize((int) raPath.getWidth(), (int) raPath.getHeight()); // <-- // The // layout // manager // would // normally // do // this // Get a buffered image of the selection for dragging a ghost image this.ghostImage = new BufferedImage((int) raPath.getWidth(), (int) raPath.getHeight(), BufferedImage.TYPE_INT_ARGB_PRE); Graphics2D g2 = ghostImage.createGraphics(); // Ask the cell renderer to paint itself into the BufferedImage g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, 0.5f)); // Make the image ghostlike lbl.paint(g2); g2.dispose(); // this.getGraphics().drawImage(ghostImage, e.getDragOrigin().x, // e.getDragOrigin().y, this); e.startDrag( null, // cursor ghostImage, new Point(5, 5), new StringSelection(getFilename()), // transferable this); // drag source listener } public void dragDropEnd(DragSourceDropEvent e) { ghostImage = null; sourceNode = null; } public void dragEnter(DragSourceDragEvent e) { } public void dragExit(DragSourceEvent e) { if (!DragSource.isDragImageSupported()) { repaint(ghostRect.getBounds()); } } public void dragOver(DragSourceDragEvent e) { } public void dropActionChanged(DragSourceDragEvent e) { } public String getFilename() { TreePath path = getLeadSelectionPath(); FileNode node = (FileNode) path.getLastPathComponent(); return ((File) node.getUserObject()).getAbsolutePath(); } private DefaultTreeModel createTreeModel() { File root = FileSystemView.getFileSystemView().getRoots()[0]; FileNode rootNode = new FileNode(root); rootNode.explore(); return new DefaultTreeModel(rootNode); } public void dragEnter(DropTargetDragEvent dtde) { } public void dragOver(DropTargetDragEvent dtde) { Point pt = dtde.getLocation(); if (pt.equals(lastPoint)) { return; } if (ghostImage != null) { Graphics2D g2 = (Graphics2D) getGraphics(); // If a drag image is not supported by the platform, then draw my // own drag image if (!DragSource.isDragImageSupported()) { paintImmediately(ghostRect.getBounds()); // Rub out the last // ghost image and cue // line // And remember where we are about to draw the new ghost image ghostRect.setRect(pt.x - ptOffset.x, pt.y - ptOffset.y, ghostImage.getWidth(), ghostImage.getHeight()); g2.drawImage((ghostImage), AffineTransform .getTranslateInstance(ghostRect.getX(), ghostRect.getY()), null); } } TreePath path = getClosestPathForLocation(pt.x, pt.y); if (!(path == lastPath)) { lastPath = path; hoverTimer.restart(); } } public void dropActionChanged(DropTargetDragEvent dtde) { } public void drop(DropTargetDropEvent e) { try { DataFlavor stringFlavor = DataFlavor.stringFlavor; Transferable tr = e.getTransferable(); TreePath path = this.getPathForLocation(e.getLocation().x, e.getLocation().y); if (path == null) { e.rejectDrop(); return; } FileNode node = (FileNode) path.getLastPathComponent(); if (e.isDataFlavorSupported(DataFlavor.javaFileListFlavor) && node.isDirectory()) { e.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE); System.out.println("file cp"); List list = (List) (e.getTransferable() .getTransferData(DataFlavor.javaFileListFlavor)); Iterator iterator = list.iterator(); File parent = node.getFile(); while (iterator.hasNext()) { File f = (File) iterator.next(); cp(f, new File(parent, f.getName())); } node.reexplore(); e.dropComplete(true); this.updateUI(); } else if (e.isDataFlavorSupported(stringFlavor) && node.isDirectory()) { String filename = (String) tr.getTransferData(stringFlavor); if (filename.endsWith(".txt") || filename.endsWith(".java") || filename.endsWith(".jsp") || filename.endsWith(".html") || filename.endsWith(".htm")) { e.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE); File f = new File(filename); if (f.exists()) { f.renameTo(new File(node.getFile(), f.getName())); node.reexplore(); ((FileNode) sourceNode.getParent()).remove(sourceNode); e.dropComplete(true); this.updateUI(); } else { e.rejectDrop(); } } else { e.rejectDrop(); } } else { e.rejectDrop(); } } catch (IOException ioe) { ioe.printStackTrace(); } catch (UnsupportedFlavorException ufe) { ufe.printStackTrace(); } finally { ghostImage = null; this.repaint(); } } private void cp(File src, File dest) throws IOException { if (src.isDirectory()) { if (!dest.exists()) { boolean ret = dest.mkdir(); if (ret == false) return; } File[] fs = src.listFiles(); for (int i = 0; i < fs.length; i++) { cp(fs[i], new File(dest, fs[i].getName())); } return; } byte[] buf = new byte[1024]; FileInputStream in = new FileInputStream(src); FileOutputStream out = new FileOutputStream(dest); int len; try { while ((len = in.read(buf)) > 0) { out.write(buf, 0, len); } } finally { in.close(); out.close(); } } public void dragExit(DropTargetEvent dte) { } } class FileNode extends DefaultMutableTreeNode { private boolean explored = false; public FileNode(File file) { setUserObject(file); } public boolean getAllowsChildren() { return isDirectory(); } public boolean isLeaf() { return !isDirectory(); } public File getFile() { return (File) getUserObject(); } public boolean isExplored() { return explored; } public boolean isDirectory() { File file = getFile(); return file.isDirectory(); } public String toString() { File file = (File) getUserObject(); String filename = file.toString(); int index = filename.lastIndexOf(File.separator); return (index != -1 && index != filename.length() - 1) ? filename .substring(index + 1) : filename; } public void explore() { if (!isDirectory()) return; if (!isExplored()) { File file = getFile(); File[] children = file.listFiles(); for (int i = 0; i < children.length; ++i) { if (children[i].isDirectory()) add(new FileNode(children[i])); } for (int i = 0; i < children.length; ++i) { if (!children[i].isDirectory()) add(new FileNode(children[i])); } explored = true; } } public void reexplore() { this.removeAllChildren(); explored = false; explore(); } }
java美化JScrollPanel的滚动条
主要代码： setTitle("滚动美化"); setSize(800, 600); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container container = getContentPane(); container.setLayout(null); DefaultMutableTreeNode root = new DefaultMutableTreeNode(); DefaultTreeModel model = new DefaultTreeModel(root); for (int i = 0; i < 200; i++) { root.add(new DefaultMutableTreeNode("node_node_node_node_node_" + i)); } JTree jTree = new JTree(model); JScrollPane jScrollPane = new JScrollPane(jTree); jScrollPane.setBounds(10, 10, 200, 200); jScrollPane.getVerticalScrollBar().setUI(new ScrollBarUIEx (JScrollBar.VERTICAL)); jScrollPane.getHorizontalScrollBar().setUI(new ScrollBarUIEx (JScrollBar.HORIZONTAL)); container.add(jScrollPane); setVisible(true);
java界面程序代码
fdspackage mypkg; import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import java.util.*; import java.sql.*; import java.sql.Statement; import javax.swing.table.*; import javax.swing.tree.*; /** * * @author Administrator */ public class ClassBrowse extends JFrame implements TreeSelectionListener { Statement stmt; ResultSet rs,rsl; DefaultTableModel dtm;//定义数据模型 String[]title;//表头数组 JTree tree;//树 JTable table; DefaultTreeModel treeModel = null;//定义一个默认的树模型，用于建立树 JScrollPane scroll1,scroll2;//定义两个滚动面板 JSplitPane splitPane;//定义一个分割面板 private Object con; public ClassBrowse(){ try{ stmt = ConnectServer1. con. createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE); DefaultMutableTreeNode root = new DefaultMutableTreeNode("专业");//根 treeModel = new DefaultTreeModel(root);//建立树模型 initTree(root,0);//调用递归函数建立树模型 tree = new JTree(treeModel);//利用树模型建立树 scroll1 = new JScrollPane(tree); tree.addTreeSelectionListener(this); rs = stmt.executeQuery("select classclass.name as 班级,xsda.no as 学号,xsda.name as 姓名" + " from xsda,classclass where xsda.classid = classclass.id"); ResultSetMetaData dbmd = rs.getMetaData();//得到记录集的元数据，建立表头数组 title = new String[dbmd.getColumnCount()]; for(int i=1;i <=dbmd.getColumnCount();i++) title[i-1] = dbmd.getColumnName(i); dtm = new DefaultTableModel(null,title);//建立表格数据模型 table = new JTable(dtm);//利用数据模型建立表格 scroll2 =new JScrollPane(table); initTable();//建立表 splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,scroll1,scroll2); splitPane.setOneTouchExpandable(true); splitPane.setDividerLocation(200); this.getContentPane().add(splitPane,null);} catch(SQLException e){System.out.println(e);} setTitle("分类查询学生信息"); setSize(500,400); setVisible(true); } void initTree(DefaultMutableTreeNode root,int id){//这是递归函数 DefaultMutableTreeNode node = null;//定义节点 try{ Statement stmt = ConnectServer1. con. createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE); ResultSet rs = stmt.executeQuery("select * from classclass where parent =" + id);//查询班级类表 while(rs.next()){ int nno = rs.getInt("id");//取得分类ID String nname = rs.getString("name").trim();//取得分类名称 node = new DefaultMutableTreeNode(nname);//建立树的节点 treeModel.insertNodeInto(node, root, root.getChildCount());//插入节点 initTree(node,nno);} } catch(Exception e){} finally{ try{ rs.close(); }catch(Exception e){} } } public void valueChanged(TreeSelectionEvent e){ JTree tree=(JTree)e.getSource(); //利用JTree的getLastSelectedPathCoponent（）方法取得目前选取的节点 DefaultMutableTreeNode selectionNode = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent(); String name = ((String)selectionNode.getUserObject()); String sql = "selcet classclass.name as 班级，xsda.no as 学号,xsda.name as 姓名 from xsda,classclass where xsda.classid = classclass.id"; if(!name.equals("专业")) sql=sql + "and classid in(select id from classclass where rtrim(ltrim(str(id)))like(select ltrim(rtrim(str(id)))+'%'from classclass where rtrim(ltrim(name))='"+name+"'))"; try{ rs = stmt.executeQuery(sql);//利用嵌套查询查出所有数据 initTable(); } catch(Exception ee){} } void initTable(){ dtm.setRowCount(0); try{ rs.beforeFirst(); while(rs.next()){ Vector v1=new Vector(); for(int i=1;i <=title.length;i++) v1.addElement(rs.getString(i)); dtm.addRow(v1); } }catch(SQLException e){e.printStackTrace();} dtm.fireTableStructureChanged(); } public static void main(String arg[]){ JFrame.setDefaultLookAndFeelDecorated(true); Font font = new Font("JFrame",Font.PLAIN,14); Enumeration keys = UIManager.getLookAndFeelDefaults().keys(); while(keys.hasMoreElements()){ Object key = keys.nextElement(); if(UIManager.get(key)instanceof Font) UIManager.put(key, font); } if(!ConnectServer1.conn("jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=xsgl","sa","")){ JOptionPane.showMessageDialog(null, "连接数据库失败"); System.exit(0);//关闭数据库 } new ClassBrowse(); } }
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