JTree做的JFileTree
JFileTree提供四种构造方法：1.JFileTree()
默认系统文件树，Desktop为根节点，子节点包括各个本地磁盘，以及Desktop下所有文件，文件叶节点可见。
2.JFileTree(boolean model)
model == JFilTree.DIRECTORY_AND_FILE
同1.
model == JFileTree.DIRECTORY_NO_FILE
默认系统文件树，只显示文件夹
3.JFileTree(File file)
以file为根节点的文件树。
4.JFileTree(File file, boolean model)
自定义模式。
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/*
* JFilTree.java
*/
package edu.cdut.mtsoft.ui.component;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.concurrent.ExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JTree;
import javax.swing.SwingWorker;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
/**
* 文件系统树
* @author xiaoYu Email: yujia0525@gmail.com
*/
public class JFileTree extends JTree {
public static final boolean DIRECTORY_AND_FILE = true;//含有文件节点
public static final boolean DIRECTORY_NO_FILE = false;//不含有文件节点
private static final String DESKTOP_EN = "Desktop";
private static final String DESKTOP_ZH = "桌面";
private static final String DISK_EN = "Disk";
private JFileTreeNode systemNode = null;
private JFileTreeNode rootNode;
private DefaultTreeModel jFileTreeModel;
private boolean model;//显示文件或不显示文件
public JFileTree() throws FileNotFoundException {
this(DIRECTORY_AND_FILE);
}
public JFileTree(boolean model) {
this(null, model);
}
public JFileTree(File file) {
this(file, DIRECTORY_AND_FILE);
}
public JFileTree(File file, boolean model) {
this.model = model;
putClientProperty("JTree.lineStyle", "Angled");
//建立默认系统文件树
if (file == null || !file.exists()) {
file = new File(System.getProperty("user.home") File.separator DESKTOP_EN);
if (!file.exists()) {
file = new File(System.getProperty("user.home") File.separator DESKTOP_ZH);
}
rootNode = systemNode = new JFileTreeNode(file);
} else {
rootNode = new JFileTreeNode(file);
}
rootNode.expand();
jFileTreeModel = new DefaultTreeModel(rootNode);
setModel(jFileTreeModel);
addTreeExpansionListener(new JTreeExpansionListener());
}
public String getPathName(TreePath path) {
Object o = path.getLastPathComponent();
if (o instanceof JFileTreeNode) {
return ((JFileTreeNode) o).file.getAbsolutePath();
}
return null;
}
/**
* 文件树节点
*/
protected class JFileTreeNode extends DefaultMutableTreeNode {
protected File file;
protected boolean isDirectory;
public JFileTreeNode(File file) {
this.file = file;
isDirectory = file.isDirectory();
setUserObject(file);
}
@Override
public boolean isLeaf() {
if (file == null) {
return false;
}
return !isDirectory;
}
@Override
public String toString() {
if (file.getParentFile() == null) {
return DISK_EN "(" file.getPath().substring(0, 2) ")";
} else {
return file.getName();
}
}
@Override
public boolean getAllowsChildren() {
return isDirectory;
}
/**
* 节点展开
* @return 展开是否含有子节点
*/
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public boolean expand() {
this.removeAllChildren();
if (this.equals(systemNode)) {
File[] roots = File.listRoots();
for (int i = 0; i < roots.length; i) {
if (roots.exists()) {
this.add(new JFileTreeNode(roots));
}
}
}
File[] files = file.listFiles();
if (files == null) {
return false;
}
for (int i = 0; i < files.length; i) {
File f = files;
/**
* 文件夹必添加
* 文件则受系统文件树model控制
*/
if (f.isDirectory() || model) {
this.add(new JFileTreeNode(f));
}
}
return true;
}
}
protected class JTreeExpansionListener implements TreeExpansionListener {
public void treeExpanded(TreeExpansionEvent e) {
JFileTreeNode fileNode = (JFileTreeNode) e.getPath().getLastPathComponent();
if (fileNode != null) {
new FileNodeExpansion(fileNode).execute();
}
}
public void treeCollapsed(TreeExpansionEvent e) {
}
}
/**
* 展开节点的后台线程
*/
protected class FileNodeExpansion extends SwingWorker<Boolean, Void> {
private JFileTreeNode node;
public FileNodeExpansion(JFileTreeNode node) {
this.node = node;
}
@Override
protected Boolean doInBackground() throws Exception {
return node.expand();
}
@Override
protected void done() {
try {
//节点可以展开
if (get()) {
jFileTreeModel.reload(node);
}
} catch (InterruptedException ex) {
Logger.getLogger(JFileTree.class.getName()).log(Level.SEVERE, null, ex);
} catch (ExecutionException ex) {
Logger.getLogger(JFileTree.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
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