如何将Swing应用程序拖放到windows资源管理器

Question

我想将swing组件拖放到windows资源管理器中。

我找到了一个与我需要的答案相反的答案，尽管标题说的是相反的：摆动应用程序->拖动&放到桌面/文件夹

还发现答案中提到了OLE接口和JNI接口：https://coderanch.com/t/659365/java/Drag-Drop-Explorer

还有这个线程，OP和我有完全相同的问题：https://www.dreamincode.net/forums/topic/148892-drag-and-drop-to-windows-explorer/

Answer 1

下面是一个涉及将文件从JTree拖动到windows资源管理器的示例：

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.TransferHandler;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
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 = File.listRoots()[0];
root = new DefaultMutableTreeNode(new FileNode(fileRoot));
treeModel = new DefaultTreeModel(root);
tree = new JTree(treeModel);
tree.setShowsRootHandles(true);
tree.setDragEnabled(true);
tree.setTransferHandler(new FileTransferHandler());
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 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;
}
}
}
private class FileTransferHandler extends TransferHandler {
private static final long serialVersionUID = 1L;
@Override
protected Transferable createTransferable(JComponent c) {
JTree list = (JTree) c;
List<File> files = new ArrayList<File>();
for (TreePath path : list.getSelectionPaths()) {
files.add(new File(Arrays.stream(path.getPath()).map(Object::toString).collect(Collectors.joining(File.separator))));
}
return new FileTransferable(files);
}
@Override
public int getSourceActions(JComponent c) {
return MOVE;
}
}
private class FileTransferable implements Transferable {
private List<File> files;
public FileTransferable(List<File> files) {
this.files = files;
}
public DataFlavor[] getTransferDataFlavors() {
return new DataFlavor[] { DataFlavor.javaFileListFlavor };
}
public boolean isDataFlavorSupported(DataFlavor flavor) {
return flavor.equals(DataFlavor.javaFileListFlavor);
}
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
if (!isDataFlavorSupported(flavor)) {
throw new UnsupportedFlavorException(flavor);
}
return files;
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new FileBrowser());
}
}