windowsexplore.java

用JAVA实现的一个简单的windows资源管理器

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.border.*;
public class WindowsExplore extends JFrame {
public DefaultTreeModel createTreeModel() {  // 创建根结点, 只执行一次
 /**定义widnows界面**/
    Font font = new Font("Dialog", Font.PLAIN, 12);
    Enumeration keys = UIManager.getLookAndFeelDefaults().keys();
    while (keys.hasMoreElements()) {
         Object key = keys.nextElement();
         if (UIManager.get(key) instanceof Font) {
             UIManager.put(key, font);
         }
   } 
   try{
      UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");  
   }catch(Exception el){
      System.exit(0);  
   } /**定义widnows界面**/ 
   ImageIcon ICON_COMPUTER =  new ImageIcon("computer.gif"); 
TreeNodeData mycomputer  = new TreeNodeData("我的电脑");
mycomputer.addChileNodes();
return new DefaultTreeModel(mycomputer);
}
JTree tree;
JScrollPane scroll;
JSplitPane splitPane;
PopupMenuDemo popupmenudemo;
// ImageIcon leaf=   new ImageIcon("WINDOC.GIF");
public WindowsExplore() {
super("windows资源管理器");
  setVisible(true);
  setSize(400,500);
  
  tree = new JTree(createTreeModel());  // 返回的是根结点 DefaultTreeModel
  DefaultTreeCellRenderer cellRenderer=(DefaultTreeCellRenderer)tree.getCellRenderer();
  cellRenderer.setLeafIcon(new ImageIcon("WINDOC.GIF"));//设置叶节点图标
  
  scroll=new JScrollPane(tree);//用tree构造滚动窗口
  scroll.setSize(200,500);
  
  popupmenudemo=new PopupMenuDemo();//初始化PopupMenuDemo类对象popupmenudemo
  
  splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,scroll,popupmenudemo);
  splitPane.setSize(800,500);//用scroll1,popupmenudemo构造拆分窗口

getContentPane().add(splitPane,BorderLayout.CENTER);
pack();

addWindowListener(new WindowAdapter() { //窗口试闭器
public void windowClosing(WindowEvent e) 
{ 
System.exit(0); }
 }); 
   
tree.addTreeExpansionListener(new TreeExpansionListener(){  // 重写JTree的事件监听器
public void treeCollapsed(TreeExpansionEvent e) {
}
public void treeExpanded(TreeExpansionEvent e) {
TreePath path = e.getPath();  // 表示到某节点的一条路径   返回已被扩张 / 折叠的值的路径
FileNode node = (FileNode)path.getLastPathComponent();  // 文件路径 <- (树)路径的最后一个组件

if( ! node.isExplored()) 
{ DefaultTreeModel model = (DefaultTreeModel)tree.getModel();// 返回提供数据的 TreeModel
node.explore();
model.nodeStructureChanged(node);  // 当彻底改变节点的子节点和子节点的子节点时调用该方法，这将导致记入一个 treeStructureChanged 事件
}
}
});
}

public static void main(String args[]) {//主函数，测试程序；
WindowsExplore windowsexplore=new WindowsExplore();
 windowsexplore.pack();
}
}
class PopupMenuDemo extends JScrollPane
{
	public JPopupMenu popup;//构造监听器
	public PopupMenuDemo()
	{setSize(200,300);
		popup=new JPopupMenu();
		ActionListener menuListener=new ActionListener()
		{
			public void actionPerformed(ActionEvent event){
				System.out.println("Popup menu item["+event.getActionCommand()+"[was pressed.");
		}
	};
	//构建弹出菜单
	JMenuItem item;
	popup.add(item=new JMenuItem("打开",new ImageIcon("OPENFOLD.GIF")));
	item.setHorizontalTextPosition(JMenuItem.RIGHT);
	item.addActionListener(menuListener);
	
	popup.add(item=new JMenuItem("剪贴",new ImageIcon("CUT.GIF")));
    item.setHorizontalTextPosition(JMenuItem.RIGHT);			
    item.addActionListener(menuListener);
   
    popup.add(item=new JMenuItem("复制",new ImageIcon("COPY.GIF")));
    item.setHorizontalTextPosition(JMenuItem.RIGHT);			
    item.addActionListener(menuListener);
   
    popup.add(item=new JMenuItem("粘贴",new ImageIcon("PASTE.GIF")));
    item.setHorizontalTextPosition(JMenuItem.RIGHT);			
    item.addActionListener(menuListener);
    popup.addSeparator();
    			
    //设置弹出菜单的样式
    popup.setBorder(new BevelBorder(BevelBorder.RAISED));
    popup.addPopupMenuListener(new PopupPrintListener());
    addMouseListener(new MousePopupListener());
   }
   //使用内部类来监听鼠标事件 
   class MousePopupListener extends MouseAdapter{
   	public void mousePressed(MouseEvent e){checkPopup(e);}
   	public void mouseClicked(MouseEvent e){checkPopup(e);}
   	public void mouseReleased(MouseEvent e){checkPopup(e);}
   	private void checkPopup(MouseEvent e){
   		if(e.isPopupTrigger()){
   			popup.show(PopupMenuDemo.this,e.getX(),e.getY());
   		}
   	}
   }
   //使用内部类来显示弹出菜单
   class PopupPrintListener implements PopupMenuListener{
   	public void popupMenuWillBecomeVisible(PopupMenuEvent e){
   		System.out.println("Popup menu will be visible!");
   	}
   		public void popupMenuWillBecomeInvisible(PopupMenuEvent e){
   		System.out.println("Popup menu will be invisible!");
   	}
   		public void popupMenuCanceled(PopupMenuEvent e){
   		System.out.println("Popup menu is hidden!");
   	}
   }
}

class FileNode extends DefaultMutableTreeNode {
private boolean explored = false;

public FileNode(File file) { 
setUserObject(file); 
}
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 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();  // 获取文件名
return file.isDirectory();  // 测试当前 File 对象表示的文件是否是一个路径, 还能展开
}

public void explore() {  
if(!isDirectory())   // 当前文件路径所对应是系统文件还是文件夹 
return ;

if(!isExplored()) {  // 该层第一次被打开, 展开当前结点的所有子元素
File file = getFile();  // 该节点的用户对象
File[] children = file.listFiles();
for(int i=0; i < children.length; ++i) 
add(new FileNode(children[i]));  // 子元素被实例化, 并添加到当前节点下 
explored = true;
}
}
}

/* class FileNode extends DefaultMutableTreeNode {
  private boolean explored = false;

  public FileNode(File file) {
    setUserObject(file);
    allowsChildren = file.isDirectory();
  }

  public boolean isLeaf() {
    return!isDirectory();
  }

  public File getFile() {
    return (File) getUserObject();
  }

  public boolean isExplored() {
    return explored;
  }

  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;
  }

  //explore the node to get children.
  //if already explored, do nothing to get higher performance
  public void isExplore() {
    if (!explored) {
      explore();
    }
  }

  //when necessary, e.g. when the files on the hard drive have been changed, force the node to explore.
  public void explore() {
    removeAllChildren();
    File file = getFile();
    File[] children = file.listFiles();
    if (children == null || children.length == 0) {
      return;
    }
    for (int i = 0; i < children.length; i++) {
      if (children[i].isDirectory()) {
        add(new FileNode(children[i]));
      }
    }
    explored = true;
  }
}

*/

class TreeNodeData extends DefaultMutableTreeNode  
{
private File data;
private String title;

public TreeNodeData(String title)
{
super(title);
data = new File(title);
this.title = title;
}

public void addChileNodes()
{
File drivers[] = File.listRoots();
for (int i = 0; i < drivers.length; i++)
{
this.add(new FileNode(drivers[i]));   
}
}

public TreeNodeData(File file,String title)
{
super(file.getPath());
data = file;
this.title = title;
File a = new File(title);
FileNode b = new FileNode(a);
add( b );
}
}