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标题:
JTree做的JFileTree
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作者:
jolielee
时间:
2009-2-17 10:58
标题:
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。 view plaincopy to clipboardprint? /* * 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); }
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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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