Java实现的Windows资源管理器实例

// FileTree.java/*********************************************************** *  Author: Jason *   email: tl21cen@hotmail.com * CSDN blog: http://blog.csdn.net/UnAgain/ ***********************************************************/package tl.exercise.swing;import java.awt.Component;import java.io.File;import java.util.Vector;import javax.swing.Icon;import javax.swing.JTree;import javax.swing.event.TreeExpansionEvent;import javax.swing.event.TreeExpansionListener;import javax.swing.event.TreeModelListener;import javax.swing.event.TreeSelectionEvent;import javax.swing.event.TreeSelectionListener;import javax.swing.filechooser.FileSystemView;import javax.swing.tree.DefaultTreeCellRenderer;import javax.swing.tree.TreeModel;import javax.swing.tree.TreePath;public class FileTree extends JTree {  static final long serialVersionUID = 0;  private FileList theList;  public FileTree(FileList list) {    theList = list;    setModel(new FileSystemModel(new FolderNode()));    this.setCellRenderer(new FolderRenderer());    addTreeSelectionListener(new TreeSelectionListener() {      public void valueChanged(TreeSelectionEvent tse) {      }    });       this.setSelectionRow(0);  }  public void fireValueChanged(TreeSelectionEvent tse) {    TreePath tp = tse.getNewLeadSelectionPath();    Object o = tp.getLastPathComponent();    // theList.fireTreeSelectionChanged((PathNode)o);    theList.fireTreeSelectionChanged((FolderNode) o);  }  public void fireTreeCollapsed(TreePath path) {    super.fireTreeCollapsed(path);    TreePath curpath = getSelectionPath();    if (path.isDescendant(curpath)) {      setSelectionPath(path);    }  }  public void fireTreeWillExpand(TreePath path) {    System.out.println("Path will expand is " + path);  }  public void fireTreeWillCollapse(TreePath path) {    System.out.println("Path will collapse is " + path);  }  class ExpansionListener implements TreeExpansionListener {    FileTree tree;    public ExpansionListener(FileTree ft) {      tree = ft;    }    public void treeCollapsed(TreeExpansionEvent tee) {    }    public void treeExpanded(TreeExpansionEvent tee) {    }  }}class FileSystemModel implements TreeModel {  I_fileSystem theRoot;  char fileType = I_fileSystem.DIRECTORY;  public FileSystemModel(I_fileSystem fs) {    theRoot = fs;  }  public Object getRoot() {    return theRoot;  }  public Object getChild(Object parent, int index) {    return ((I_fileSystem) parent).getChild(fileType, index);  }  public int getChildCount(Object parent) {    return ((I_fileSystem) parent).getChildCount(fileType);  }  public boolean isLeaf(Object node) {    return ((I_fileSystem) node).isLeaf(fileType);  }  public int getIndexOfChild(Object parent, Object child) {    return ((I_fileSystem) parent).getIndexOfChild(fileType, child);  }  public void valueForPathChanged(TreePath path, Object newValue) {  }  public void addTreeModelListener(TreeModelListener l) {  }  public void removeTreeModelListener(TreeModelListener l) {  }}interface I_fileSystem {  final public static char DIRECTORY = 'D';  final public static char FILE = 'F';  final public static char ALL = 'A';  public Icon getIcon();  public I_fileSystem getChild(char fileType, int index);  public int getChildCount(char fileType);  public boolean isLeaf(char fileType);  public int getIndexOfChild(char fileType, Object child);}/** * A data model for a JTree. This model explorer windows file system directly. * * <p> * Perhaps there is a fatal bug with this design. For speed, each of instances * of this model contains file objects of subdirectory, up to now, there isn't * any method to release them until program be end. I'm afraid that the memory * would be full of if the file system is large enough and JVM memery size * setted too small. * * <p> * I won't pay more attention to solve it. it isn't goal of current a exercise. * * @author Jason */class FolderNode implements I_fileSystem {  // private static FolderNode theRoot;  private static FileSystemView fsView;  private static boolean showHiden = true;;  private File theFile;  private Vector<File> all = new Vector<File>();  private Vector<File> folder = new Vector<File>();  /**   * set that whether apply hiden file.   *   * @param ifshow   */  public void setShowHiden(boolean ifshow) {    showHiden = ifshow;  }  public Icon getIcon() {    return fsView.getSystemIcon(theFile);  }  public String toString() {    // return fsView.    return fsView.getSystemDisplayName(theFile);  }  /**   * create a root node. by default, it should be the DeskTop in window file   * system.   *   */  public FolderNode() {    fsView = FileSystemView.getFileSystemView();    theFile = fsView.getHomeDirectory();    prepareChildren();  }  private void prepareChildren() {   File[] files = fsView.getFiles(theFile, showHiden);    for (int i = 0; i < files.length; i++) {      all.add(files[i]);      if (files[i].isDirectory()          && !files[i].toString().toLowerCase().endsWith(".lnk")) {        folder.add(files[i]);      }    }  }  private FolderNode(File file) {    theFile = file;    prepareChildren();  }  public FolderNode getChild(char fileType, int index) {    if (I_fileSystem.DIRECTORY == fileType) {      return new FolderNode(folder.get(index));    } else if (I_fileSystem.ALL == fileType) {      return new FolderNode(all.get(index));    } else if (I_fileSystem.FILE == fileType) {      return null;    } else {      return null;    }  }  public int getChildCount(char fileType) {    if (I_fileSystem.DIRECTORY == fileType) {      return folder.size();    } else if (I_fileSystem.ALL == fileType) {      return all.size();    } else if (I_fileSystem.FILE == fileType) {      return -1;    } else {      return -1;    }  }  public boolean isLeaf(char fileType) {    if (I_fileSystem.DIRECTORY == fileType) {      return folder.size() == 0;    } else if (I_fileSystem.ALL == fileType) {      return all.size() == 0;    } else if (I_fileSystem.FILE == fileType) {      return true;    } else {      return true;    }  }  public int getIndexOfChild(char fileType, Object child) {    if (child instanceof FolderNode) {      if (I_fileSystem.DIRECTORY == fileType) {        return folder.indexOf(((FolderNode) child).theFile);      } else if (I_fileSystem.ALL == fileType) {        return all.indexOf(((FolderNode) child).theFile);      } else if (I_fileSystem.FILE == fileType) {        return -1;      } else {        return -1;      }    } else {      return -1;    }  }}class FolderRenderer extends DefaultTreeCellRenderer {  private static final long serialVersionUID = 1L;  public Component getTreeCellRendererComponent(JTree tree, Object value,      boolean sel, boolean expanded, boolean leaf, int row,      boolean hasFocus) {    I_fileSystem node = (I_fileSystem) value;    Icon icon = node.getIcon();    setLeafIcon(icon);    setOpenIcon(icon);    setClosedIcon(icon);    return super.getTreeCellRendererComponent(tree, value, sel, expanded,       leaf, row, hasFocus);  }}