我想用JTree创建一个非常简单的文件管理器,但我只看到了一些非常复杂的代码,我希望创建这个脚本非常干净和简单。
你能帮我吗?如何在JTree中列出计算机的目录?
你能帮我吗?如何在JTree中列出计算机的目录?
我写了一个我能想到的最简单的文件浏览器示例。它列出了Windows计算机C盘上所有目录和文件。
这是结果。
这里是代码。我将所有内容放在一个类中,以便更容易粘贴。你应该将类分开。
package com.ggl.testing;
import java.io.File;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
public class FileBrowser implements Runnable {
private DefaultMutableTreeNode root;
private DefaultTreeModel treeModel;
private JTree tree;
@Override
public void run() {
JFrame frame = new JFrame("File Browser");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
File fileRoot = new File("C:/");
root = new DefaultMutableTreeNode(new FileNode(fileRoot));
treeModel = new DefaultTreeModel(root);
tree = new JTree(treeModel);
tree.setShowsRootHandles(true);
JScrollPane scrollPane = new JScrollPane(tree);
frame.add(scrollPane);
frame.setLocationByPlatform(true);
frame.setSize(640, 480);
frame.setVisible(true);
CreateChildNodes ccn =
new CreateChildNodes(fileRoot, root);
new Thread(ccn).start();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new FileBrowser());
}
public class CreateChildNodes implements Runnable {
private DefaultMutableTreeNode root;
private File fileRoot;
public CreateChildNodes(File fileRoot,
DefaultMutableTreeNode root) {
this.fileRoot = fileRoot;
this.root = root;
}
@Override
public void run() {
createChildren(fileRoot, root);
}
private void createChildren(File fileRoot,
DefaultMutableTreeNode node) {
File[] files = fileRoot.listFiles();
if (files == null) return;
for (File file : files) {
DefaultMutableTreeNode childNode =
new DefaultMutableTreeNode(new FileNode(file));
node.add(childNode);
if (file.isDirectory()) {
createChildren(file, childNode);
}
}
}
}
public class FileNode {
private File file;
public FileNode(File file) {
this.file = file;
}
@Override
public String toString() {
String name = file.getName();
if (name.equals("")) {
return file.getAbsolutePath();
} else {
return name;
}
}
}
}
TreeModel
实现(https://dev59.com/x27Xa4cB1Zd3GeqPo13c#14837208)。 - trashgod模型应通过右键单击属性并清除模型来手动清除
使用的函数
public void displayDirectoryContents(File dir, DefaultMutableTreeNode root2)
throws InterruptedException {
DefaultMutableTreeNode newdir = new DefaultMutableTreeNode();
// creates array of file type for all the files found
File[] files = dir.listFiles();
for (File file : files) {
if (file == null) {
System.out.println("NUll directory found ");
continue;
}
if (file.isDirectory()) {
// file is a directory that is a folder has been dound
if (file.listFiles() == null) {
// skips null files
continue;
}
// gets the current model of the jtree
DefaultTreeModel model = (DefaultTreeModel) result.getModel();
// gets the root
DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
// generates a node newdir using filename
newdir = new DefaultMutableTreeNode(file.getName());
// adds a node to the root of the jtree
root2.add(newdir);
// refresh the model to show the changes
model.reload();
// recursively calls the function again to explore the contents
// folder
displayDirectoryContents(file, newdir);
} else {
// Else part File is not a directory
// gets the current model of the tree
DefaultTreeModel model = (DefaultTreeModel) result.getModel();
// selected node is the position where the new node will be
// inserted
DefaultMutableTreeNode selectednode = root2;
DefaultMutableTreeNode newfile = new DefaultMutableTreeNode(file.getName());
// inserts a node newfile under selected node which is the root
model.insertNodeInto(newfile, selectednode, selectednode.getChildCount());
// refresh the model to show the changes
model.reload();
}
}
}
扫描器函数用于初始化上述函数。
public void scanner() throws InterruptedException {
// creates a file with the location filename
String location = "C:\\Users\\Ashish Padalkar\\Documents";
File currentDir = new File(location);
// result is the variable name for jtree
DefaultTreeModel model = (DefaultTreeModel) result.getModel();
// gets the root of the current model used only once at the starting
DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
// function caled
displayDirectoryContents(currentDir, root);
}