我正在用 JAVA 创建一个 FTP 应用程序，用于在服务器和客户端之间传输文件。我为客户端创建了一个 GUI，它应该在左侧显示客户端目录结构，在右侧显示服务器，但我无法弄清楚如何传递服务器的目录结构并将其显示在客户端的 GUI 上。我尝试将它作为对象从服务器传递并在客户端读取它，但无法弄清楚如何将它传递给服务器的 JTree。但是我能够在 GUI 上显示客户端目录结构。我曾尝试四处寻找解决方案，但找不到任何对我有帮助的解决方案。任何帮助将不胜感激。
以下是我正在使用的课程。我现在只使用一个简单的客户端和服务器类，它们在建立连接时相互发送消息：
这是我的服务器类：
public class SimpleServer {
public FileSystemModel systemModel;
public static void main(String[] args) throws IOException {
SimpleServer s = new SimpleServer();
s.run();
}
public void run() throws IOException{
ServerSocket serverSoc = new ServerSocket(150);
System.out.println("Server up and running on port 150");
Socket soc = serverSoc.accept();
PrintStream ps = new PrintStream(soc.getOutputStream());
ps.println("Welcome");
InputStreamReader is = new InputStreamReader(soc.getInputStream());
BufferedReader br = new BufferedReader(is);
String message = br.readLine();
System.out.println(message);
//Not sure if this works
ObjectOutputStream oOut = new ObjectOutputStream(soc.getOutputStream());
String dir = "C:/Users/David/Desktop/Server/";
systemModel = new FileSystemModel(new File(dir));
oOut.writeObject(systemModel);
/*if (message != null){
PrintStream ps = new PrintStream(soc.getOutputStream());
ps.println("Message Received");
}*/
}
}
这是我的客户类：
public class SimpleClient {
Socket soc;
public void run() throws UnknownHostException, IOException {
soc = new Socket("localhost", 150);
InputStreamReader is = new InputStreamReader(soc.getInputStream());
BufferedReader br = new BufferedReader(is);
String message = br.readLine();
System.out.println(message);
if (message != null) {
PrintStream ps = new PrintStream(soc.getOutputStream());
ps.println("Message Received");
}
}
//Not sure if this method is working
public Object getObject() throws Exception {
ObjectInputStream oIn = new ObjectInputStream(soc.getInputStream());
Object model = oIn.readObject();
return model;
}
}
这个类在我的 GUI 中用于显示 JTree 中的目录结构。目前只能显示客户端的目录结构。
class FileSystemModel implements TreeModel, Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private File root;
private Vector<TreeModelListener> listeners = new Vector<TreeModelListener>();
public FileSystemModel(File rootDirectory) {
root = rootDirectory;
}
//All the other implemented methods from TreeModel goes here
private void fireTreeNodesChanged(TreePath parentPath, int[] indices,
Object[] children) {
TreeModelEvent event = new TreeModelEvent(this, parentPath, indices,
children);
Iterator<TreeModelListener> iterator = listeners.iterator();
TreeModelListener listener = null;
while (iterator.hasNext()) {
listener = iterator.next();
listener.treeNodesChanged(event);
}
}
private class TreeFile extends File {
/**
*
*/
private static final long serialVersionUID = -5775093232151119831L;
public TreeFile(File parent, String child) {
super(parent, child);
}
@Override
public String toString() {
return getName();
}
}
}
最后，这是我的 GUI 类，它显示了两个 JTree。左侧是客户端的目录结构，右侧是服务器的目录结构，我在显示时遇到问题：
public class GUI extends JFrame {
private JPanel contentPane;
private FileSystemModel systemModel;
private SimpleClient c;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
GUI frame = new GUI();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
* @throws Exception
*/
public GUI() throws Exception {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
JMenu mnFile = new JMenu("File");
menuBar.add(mnFile);
//Connect Button
JMenuItem mntmConnect = new JMenuItem("Connect");
mntmConnect.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
c = new SimpleClient();
try {
c.run();
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
mnFile.add(mntmConnect);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JSplitPane splitPane = new JSplitPane();
contentPane.add(splitPane, BorderLayout.CENTER);
String dir = "C:/Users/David/Desktop/Client/";
systemModel = new FileSystemModel(new File(dir));
final JTree treeClient = new JTree(systemModel);
treeClient.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent arg0) {
File file = (File) treeClient.getLastSelectedPathComponent();
//fileDetailsTextArea.setText(getFileDetails(file));
System.out.println(getFileDetails(file));
}
});
splitPane.setLeftComponent(treeClient);
//This is where I want to pass the server's directory structure
JTree treeServer = new JTree();
splitPane.setRightComponent(treeServer);
}
private String getFileDetails(File file) {
// returns details of the file clicked
}
}