java 代码远程访问本地电脑的文件

以下是一个使用Java Socket实现远程访问本地电脑文件的示例代码：

服务器端代码：

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

public class FileServer {
    public static void main(String[] args) {
        try {
            ServerSocket serverSocket = new ServerSocket(8888);
            System.out.println("Server started, listening on port 8888...");

            while (true) {
                Socket socket = serverSocket.accept();
                System.out.println("Client connected: " + socket.getRemoteSocketAddress());

                // 获取客户端发送的文件名
                BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                String fileName = in.readLine();
                System.out.println("File requested: " + fileName);

                // 读取本地文件并发送给客户端
                File file = new File(fileName);
                if (file.exists()) {
                    OutputStream out = socket.getOutputStream();
                    FileInputStream fileIn = new FileInputStream(file);
                    byte[] buffer = new byte[1024];
                    int len;
                    while ((len = fileIn.read(buffer)) != -1) {
                        out.write(buffer, 0, len);
                    }
                    fileIn.close();
                    out.close();
                } else {
                    System.out.println("File not found: " + fileName);
                }

                socket.close();
                System.out.println("Client disconnected.");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

客户端代码：

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

public class FileClient {
    public static void main(String[] args) {
        try {
            String serverAddress = "localhost";
            int serverPort = 8888;
            String fileName = "test.txt";

            Socket socket = new Socket(serverAddress, serverPort);
            System.out.println("Connected to server: " + socket.getRemoteSocketAddress());

            // 发送文件名给服务器端
            PrintWriter out = new PrintWriter(socket.getOutputStream());
            out.println(fileName);
            out.flush();

            // 接收服务器端发送的文件内容
            InputStream in = socket.getInputStream();
            FileOutputStream fileOut = new FileOutputStream("output.txt");
            byte[] buffer = new byte[1024];
            int len;
            while ((len = in.read(buffer)) != -1) {
                fileOut.write(buffer, 0, len);
            }
            fileOut.close();
            in.close();

            socket.close();
            System.out.println("Disconnected from server.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

在运行客户端代码前，需要先将本地文件test.txt放到服务器端的工作目录下。运行服务器端代码后，再运行客户端代码即可从服务器端下载test.txt文件到本地电脑的工作目录下，并保存为output.txt文件。