我正在尝试制作一个 JTree 来复制放置在其上的文件的结构。我遇到的问题是我的代码只是我添加的第一个文件。当我尝试将另一个文件 d&d 到树中时,它会被忽略。这是拖放功能:
root = new DefaultMutableTreeNode("Home");
JTree jtree = new JTree(root);
/**
* JScrollPane and other swing code here.
* Try-catch blocks in the code below were
* removed for readability
**/
jtree.setDropTarget(new DropTarget() {
public void drop(DropTargetDropEvent evt) {
evt.acceptDrop(DnDConstants.ACTION_COPY);
ArrayList<File> inputFiles = new ArrayList<>();
inputFiles.addAll((List<File>) evt.getTransferable().getTransferData(DataFlavor.javaFileListFlavor));
updateTree(inputFiles);
}
});
这是我用来添加节点的方法:
private void updateTree(ArrayList<File> inputFiles){
for(File f: inputFiles){
String[] filePath = f.getPath().split("\\\\");
DefaultMutableTreeNode node = root;
DefaultMutableTreeNode child;
for(String g: filePath){
child = new DefaultMutableTreeNode(g);
node.add(child);
node = child;
}
}
}