winexplorer.java

一个关于JTree的例子

package com.thb.tree;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.DateFormat;
import javax.swing.event.*;
import javax.swing.table.*;
import javax.swing.tree.*;
import javax.swing.filechooser.*;
import java.io.*;
import java.util.*;

public class WinExplorer extends JFrame implements TreeSelectionListener{
JPanel contentPane=(JPanel)getContentPane();;
JMenuBar menuBar = new JMenuBar();
JMenu menuFile = new JMenu("文件");
JMenuItem menuItemExit = new JMenuItem("退出");
JToolBar toolBar = new JToolBar();
JButton bttUp = new JButton();
Icon iconUp=UIManager.getIcon("FileChooser.upFolderIcon");
JLabel statusBar = new JLabel();
DetailTable detailTable = new DetailTable();
JScrollPane sp = new JScrollPane(detailTable);
JSplitPane split = new JSplitPane();
FileSystemView fileSystemView=FileSystemView.getFileSystemView();
FileNode root=new FileNode(fileSystemView.getRoots()[0]);
DefaultTreeModel treeModel=new DefaultTreeModel(root);
JTree tree = new JTree(treeModel);
public static void main(String argv[]){
  try {
    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    Font font=new Font("宋体",Font.PLAIN,12);
    String names[]={"Label","CheckBox","PopupMenu","TextPane",
                   "MenuItem","CheckBoxMenuItem","JRadioButtonMenuItem",
                   "ComboBox","Button","Tree","ScrollPane","TabbedPane",
                   "EditorPane","TitledBorder","Menu","TextArea","OptionPane",
                   "MenuBar","ToolBar","ToggleButton","ToolTip","ProgressBar",
                   "TableHeader","Panel","List","ColorChooser","PasswordField",
                   "TextField","Table","Label","Viewport","RadioButtonMenuItem",
                   "RadioButton"};
    for(int i=0;i<names.length;i++)UIManager.put(names[i]+".font",font);
    UIManager.put("Label.foreground",Color.black);
    UIManager.put("Border.foreground",Color.black);
    UIManager.put("TitledBorder.titleColor",Color.black);
    new WinExplorer().show();
 }catch(Exception e){
    e.printStackTrace();
 }
}
public WinExplorer() {
contentPane.setLayout(new BorderLayout());
Dimension dimension = getToolkit().getScreenSize();
int i = (dimension.width - 640) / 2;
int j = (dimension.height - 480) / 2;
setBounds(i,j,640,480);
setTitle("资源管理器");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setJMenuBar(menuBar);
statusBar.setText(" ");
menuItemExit.addActionListener(new ActionListener()  {
  public void actionPerformed(ActionEvent e) {System.exit(0);}
});
bttUp.setIcon(iconUp);
bttUp.addActionListener(new java.awt.event.ActionListener() {
  public void actionPerformed(ActionEvent e) {
    try{
        TreePath upPath=tree.getSelectionPath().getParentPath();
        if(upPath!=null){
              tree.setSelectionPath(upPath);
              tree.scrollPathToVisible(upPath);
        }
     }catch(Exception ex){}
  }
});
split.setDividerSize(6);
split.setLeftComponent(new JScrollPane(tree));
split.setRightComponent(sp);
split.setDividerLocation(180);
sp.getViewport().setBackground(Color.white);
menuFile.add(menuItemExit);
menuBar.add(menuFile);
contentPane.add(toolBar, BorderLayout.NORTH);
toolBar.add(bttUp, null);
contentPane.add(statusBar, BorderLayout.SOUTH);
contentPane.add(split, BorderLayout.CENTER);
tree.addTreeExpansionListener(new MyExpandsionListener());
tree.setCellRenderer(new MyTreeCellRenderer());
tree.addTreeSelectionListener(this);
tree.setSelectionRow(0);
tree.setComponentOrientation(ComponentOrientation.UNKNOWN);
}

public void valueChanged(TreeSelectionEvent e){
 Object obj=tree.getLastSelectedPathComponent();
 if(obj==null)return;
 else detailTable.setParent(((FileNode)obj).getFile());
}

class MyTreeCellRenderer extends DefaultTreeCellRenderer {
public MyTreeCellRenderer() {}
public Component getTreeCellRendererComponent(JTree tree,Object value,
          boolean sel,boolean expanded,boolean leaf,int row,boolean hasFocus) {
    super.getTreeCellRendererComponent(tree,value,sel,expanded,leaf,row,hasFocus);
    setIcon(fileSystemView.getSystemIcon(((FileNode)value).getFile()));
    return this;
}
}
class MyExpandsionListener implements TreeExpansionListener {
public MyExpandsionListener() {}
public void treeExpanded(TreeExpansionEvent event) {
    if (tree.getLastSelectedPathComponent()==null){return;}
    tree.setCursor(new Cursor(Cursor.WAIT_CURSOR));
    TreePath path = event.getPath();
    FileNode node = (FileNode)path.getLastPathComponent();
    node.explore();
    treeModel.nodeStructureChanged(node);
    tree.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
public void treeCollapsed(TreeExpansionEvent event) {}
}
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 void setExplored(boolean b){ explored=b;}
  public boolean isDirectory() { return getFile().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(!isExplored()) {
          File file = getFile();
          File[] children = file.listFiles();
          if(children==null||children.length==0)return;
          for(int i=0; i < children.length; ++i)
          {
               File f=children[i];
               if(f.isDirectory())add(new FileNode(children[i]));
          }
          explored = true;
      }
 }
}
class DetailTable extends JTable{
    DetailTableModel model=new DetailTableModel();
    public DetailTable(){
        setModel(model);
        setShowGrid(false);
        TableColumnModel colModel = getColumnModel();
        for (int i=0;i<3;i++)
          colModel.getColumn(i).setCellRenderer(new DetailsTableCellRenderer());
        setRowHeight(18);
        this.addMouseListener(new MouseAdapter(){
            public void mouseClicked(MouseEvent e) {
                if(e.getClickCount()==2){
                   for (int i = 0; i <getRowCount(); i++) {
                        if(getCellRect(i,0,true).contains(e.getPoint())){
                            openSelect();
                            break;
                        }
                    }
                }
            }
        });
    }
    public void openSelect(){
        Object obj=model.getValueAt(getSelectedRow(),0);
        if(obj==null)return;
        File f=(File)obj;
        if(f.isDirectory()){
            //expand tree
        }else{
            //open select file
        }
    }
    public void setParent(File parent){
        model.removeAllRows();
        File list[]=parent.listFiles();
        if(list==null)return;
        Vector vDir=new Vector(),vFile=new Vector();
        for (int i = 0; i < list.length; i++) {
            if(list[i].isDirectory())vDir.add(list[i]);
            else vFile.add(list[i]);
        }
        sortElements(vFile);
        sortElements(vDir);
        for (int i = 0; i < vDir.size(); i++)model.addFile((File)vDir.elementAt(i));
        for (int i = 0; i < vFile.size(); i++)model.addFile((File)vFile.elementAt(i));
    }
    public void sortElements(Vector v)
     {
        for(int i=0;i<v.size();i++)
        {
             int k=i;
             for(int j=i+1;j<v.size();j++){
                 File fa=(File)v.elementAt(j);
                 File fb=(File)v.elementAt(k);
                 if(fileSystemView.getSystemDisplayName(fa).toLowerCase().compareTo(
                      fileSystemView.getSystemDisplayName(fb).toLowerCase())<0)k=j;
             }
             if(k!=i)swap(k,i,v);
        }
     }
     private void swap(int loc1,int loc2,Vector v){
         Object tmp=v.elementAt(loc1);
         v.setElementAt(v.elementAt(loc2),loc1);
         v.setElementAt(tmp,loc2);
     }
    class DetailTableModel extends DefaultTableModel {
        public DetailTableModel() {
            addColumn("名称");
            addColumn("大小");
            addColumn("修改时间");
        }
        public void addFile(File f){
            addRow(new Object[]{f,new Double(f.length()/1024),
                 new java.sql.Date(f.lastModified())});
        }
        public void removeAllRows(){
            while(getRowCount()!=0) removeRow(0);
        }
        public boolean isCellEditable(int row, int column) {return false;}
    }
    class DetailsTableCellRenderer extends DefaultTableCellRenderer {
      DetailsTableCellRenderer() {}
      public Component getTableCellRendererComponent(JTable table, Object value,
                            boolean isSelected, boolean hasFocus, int row, int column) {
          if (column == 1){
              setHorizontalAlignment(SwingConstants.TRAILING);
              isSelected=hasFocus=false;
          }else if(column==2){
              setHorizontalAlignment(SwingConstants.CENTER);
              isSelected=hasFocus=false;
          }else setHorizontalAlignment(SwingConstants.LEADING);
          return super.getTableCellRendererComponent(
                      table, value, isSelected, hasFocus, row, column);
      }
      public void setValue(Object value) {
          setIcon(null);
          if (value instanceof File) {
              File file = (File)value;
              setText(fileSystemView.getSystemDisplayName(file));
              setIcon(fileSystemView.getSystemIcon(file));
          }else{
              super.setValue(value);
          }
      }
  }
}

}