Java程序将一台服务器的文件夹内容传递到另外一台服务器，请提供相关demo

好的，以下是一个简单的 Java 程序，用于将一台服务器的文件夹内容传递到另外一台服务器：

import java.io.*;
import java.net.*;

public class FileTransferDemo {
    public static void main(String[] args) {
        String sourceHost = "source.host.com";
        String sourceFolder = "/path/to/source/folder";
        String destinationHost = "destination.host.com";
        String destinationFolder = "/path/to/destination/folder";
        
        try {
            // Connect to the source server
            Socket sourceSocket = new Socket(sourceHost, 8888);
            BufferedInputStream sourceStream = new BufferedInputStream(sourceSocket.getInputStream());
            
            // Connect to the destination server
            Socket destinationSocket = new Socket(destinationHost, 8888);
            BufferedOutputStream destinationStream = new BufferedOutputStream(destinationSocket.getOutputStream());
            
            // Send the source folder path to the source server
            PrintWriter sourceWriter = new PrintWriter(sourceSocket.getOutputStream(), true);
            sourceWriter.println(sourceFolder);
            
            // Receive the file list from the source server
            BufferedReader fileListReader = new BufferedReader(new InputStreamReader(sourceStream));
            String fileList = fileListReader.readLine();
            
            // Send the file list to the destination server
            PrintWriter fileListWriter = new PrintWriter(destinationStream, true);
            fileListWriter.println(fileList);
            
            // Loop through the files in the source folder and transfer them to the destination server
            String[] files = fileList.split(",");
            for (String file : files) {
                String filePath = sourceFolder + "/" + file;
                FileInputStream fileStream = new FileInputStream(filePath);
                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = fileStream.read(buffer)) != -1) {
                    destinationStream.write(buffer, 0, bytesRead);
                }
                fileStream.close();
            }
            
            // Clean up
            fileListWriter.close();
            fileListReader.close();
            sourceWriter.close();
            sourceStream.close();
            sourceSocket.close();
            destinationStream.close();
            destinationSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

这个程序假设源服务器和目标服务器都运行在端口 8888 上，并且使用 TCP 协议进行通信。在程序中，我们首先连接到源服务器和目标服务器，然后向源服务器发送源文件夹路径并接收文件列表。接下来，我们将文件列表发送到目标服务器，并循环遍历源文件夹中的每个文件，将它们传输到目标服务器。最后，我们清理所有连接和流。

请注意，此示例程序仅用于演示目的。实际应用中，您需要考虑更多的边缘情况和错误处理。