设计一个基于TCP的文件上传功能，将文件从客户端上传到指定服务器。 进阶设计：文件传输完成后服务器给客户端发送“文件上传成功”的信息。java代码

好的，下面给出一个基于Java的简单实现，仅供参考。

客户端代码：

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

public class FileUploader {
    private static final String SERVER_IP = "127.0.0.1";
    private static final int SERVER_PORT = 8888;
    private static final int BUFFER_SIZE = 1024;

    public static void main(String[] args) {
        Socket socket = null;
        FileInputStream fileInputStream = null;
        DataOutputStream dataOutputStream = null;
        DataInputStream dataInputStream = null;
        try {
            // 创建Socket连接
            socket = new Socket(SERVER_IP, SERVER_PORT);
            System.out.println("Connected to server");

            // 获取文件信息
            File file = new File("path/to/file");
            String fileName = file.getName();
            long fileSize = file.length();
            int bufferSize = BUFFER_SIZE;

            // 发送文件信息
            dataOutputStream = new DataOutputStream(socket.getOutputStream());
            dataOutputStream.writeUTF(fileName);
            dataOutputStream.writeLong(fileSize);
            dataOutputStream.writeInt(bufferSize);

            // 发送文件数据
            fileInputStream = new FileInputStream(file);
            byte[] buffer = new byte[bufferSize];
            int readLength;
            while ((readLength = fileInputStream.read(buffer)) != -1) {
                dataOutputStream.write(buffer, 0, readLength);
                dataOutputStream.flush();
            }

            // 等待服务器返回上传结果
            dataInputStream = new DataInputStream(socket.getInputStream());
            String result = dataInputStream.readUTF();
            System.out.println("Upload result: " + result);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fileInputStream != null) {
                    fileInputStream.close();
                }
                if (dataOutputStream != null) {
                    dataOutputStream.close();
                }
                if (dataInputStream != null) {
                    dataInputStream.close();
                }
                if (socket != null) {
                    socket.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

服务器端代码：

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

public class FileReceiver {
    private static final int SERVER_PORT = 8888;
    private static final int BUFFER_SIZE = 1024;

    public static void main(String[] args) {
        ServerSocket serverSocket = null;
        Socket socket = null;
        FileOutputStream fileOutputStream = null;
        DataInputStream dataInputStream = null;
        DataOutputStream dataOutputStream = null;
        try {
            // 创建ServerSocket
            serverSocket = new ServerSocket(SERVER_PORT);
            System.out.println("Server started");

            // 等待客户端连接
            socket = serverSocket.accept();
            System.out.println("Client connected");

            // 接收文件信息
            dataInputStream = new DataInputStream(socket.getInputStream());
            String fileName = dataInputStream.readUTF();
            long fileSize = dataInputStream.readLong();
            int bufferSize = dataInputStream.readInt();

            // 创建文件输出流
            fileOutputStream = new FileOutputStream("path/to/save/" + fileName);

            // 接收文件数据
            byte[] buffer = new byte[bufferSize];
            int readLength;
            while ((readLength = dataInputStream.read(buffer)) != -1) {
                fileOutputStream.write(buffer, 0, readLength);
                fileOutputStream.flush();
            }

            // 发送上传结果
            dataOutputStream = new DataOutputStream(socket.getOutputStream());
            dataOutputStream.writeUTF("Upload success");

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fileOutputStream != null) {
                    fileOutputStream.close();
                }
                if (dataInputStream != null) {
                    dataInputStream.close();
                }
                if (dataOutputStream != null) {
                    dataOutputStream.close();
                }
                if (socket != null) {
                    socket.close();
                }
                if (serverSocket != null) {
                    serverSocket.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

以上代码仅供参考，实际应用中需要根据具体需求进行修改和完善。