我一直在实现一个JFileChooser作为远程文件系统的视图。当getFiles()从FileSystemViewI 使用目录位置数据发送请求到远程系统时调用。
然后我异步接收到包含我正在浏览的目录中所有文件的数据包，之后我设置文件准备更新视图（这样下次getFiles()调用它将返回接收到的文件数组）但问题是我没有不知道如何更新JFileChoosers视图。
我试过了
fileChooser.updateUI();
但它会引发以下异常：
Exception in thread "pool-1-thread-31" java.lang.NullPointerException
at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.setDirectorySelected(Unknown Source)
at javax.swing.plaf.basic.BasicFileChooserUI$Handler.valueChanged(Unknown Source)
at javax.swing.JList.fireSelectionValueChanged(Unknown Source)
at javax.swing.JList$ListSelectionHandler.valueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.moveLeadSelectionIndex(Unknown Source)
at sun.swing.FilePane.clearSelection(Unknown Source)
at sun.swing.FilePane.doFilterChanged(Unknown Source)
at sun.swing.FilePane.propertyChange(Unknown Source)
at java.beans.PropertyChangeSupport.fire(Unknown Source)
at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
at java.awt.Component.firePropertyChange(Unknown Source)
at javax.swing.JFileChooser.setFileFilter(Unknown Source)
at javax.swing.JFileChooser.addChoosableFileFilter(Unknown Source)
at javax.swing.JFileChooser.updateUI(Unknown Source)
at com.ruuhkis.remoteserver.ui.RemoteView.updateFiles(RemoteView.java:252)
at com.ruuhkis.remoteserver.ui.RemoteApplication.onFileListReceived(RemoteApplication.java:122)
at com.ruuhkis.remoteserver.packets.impl.FileListPacket.handlePacket(FileListPacket.java:32)
at com.ruuhkis.remoteserver.packets.PacketHandler$1.run(PacketHandler.java:57)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
当我在目录中并且我知道它已收到新文件列表并按 f5 时，它将显示刚刚加载的新文件，我怎样才能使它不必按 f5？此外，按 f5 会导致系统重新加载目录的预先存在的数据。
当前代码基本上是：
view = new FileSystemView() {
int c;
@Override
public File[] getFiles(File dir, boolean useFileHiding) {
if(!auto) {
PacketBuilder builder = new PacketBuilder(OpCodes.FILE_LIST_REQUEST_PACKET.getOpCode());
root = dir.getAbsolutePath();
builder.writeString(dir.getAbsolutePath());
builder.write(RemoteView.this.remote.getChannel());
}
auto = false;
if(dirContent == null)
return new File[]{new File((c++) + ".txt")};
else
return dirContent;
}
@Override
public Boolean isTraversable(File arg0) {
return true;
}
@Override
public File createNewFolder(File arg0) throws IOException {
// TODO Auto-generated method stub
return null;
}
};
c 基本上只是用于测试，所以我可以查看系统是否刷新
当我收到文件列表时，我会这样做：
public void updateFiles(String list) {
String[] parts = list.split("" + ((char)10));
File[] files = new File[parts.length];
for(int i = 0 ; i < parts.length; i++) {
files[i] = new File(root + File.separatorChar + parts[i]);
}
dirContent = files;
fileChooser.setCurrentDirectory(new File(root));
fileChooser.updateUI();
auto = true;
}