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(); } }