java使用Socket实现TCP协议的excel文件从服务器下载到本机的开发实现把服务端和客户端全写出来

在Java中，使用Socket实现TCP协议下载Excel文件涉及到服务端和客户端两个部分。首先，让我们分别来看一下这两个部分的代码：

**服务端（Server.java）**

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

public class Server {
    private static final int PORT = 8080; // 服务器监听的端口

    public static void main(String[] args) throws IOException {
        ServerSocket server = new ServerSocket(PORT);
        System.out.println("Server started on port " + PORT);

        while (true) {
            Socket clientSocket = server.accept(); // 等待客户端连接
            handleClient(clientSocket); // 处理每个连接请求
        }
    }

    private static void handleClient(Socket socket) throws IOException {
        OutputStream outputStream = socket.getOutputStream();
        File fileToServe = new File("path_to_your_excel_file.xlsx"); // 文件路径
        FileInputStream fis = new FileInputStream(fileToServe);

        byte[] buffer = new byte[(int) fileToServe.length()];
        fis.read(buffer);

        outputStream.write(buffer);
        fis.close();
        outputStream.flush();
        socket.close();
        System.out.println("File sent to client.");
    }
}

**客户端（Client.java）**

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

public class Client {
    private static final String SERVER_HOST = "localhost"; // 服务器地址
    private static final int PORT = 8080; // 服务器监听的端口

    public static void main(String[] args) {
        try (Socket socket = new Socket(SERVER_HOST, PORT)) {
            System.out.println("Connecting to server...");
            
            InputStream inputStream = socket.getInputStream();
            FileOutputStream fos = new FileOutputStream("received_excel_file.xlsx");

            byte[] buffer = new byte[4096];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                fos.write(buffer, 0, bytesRead);
            }

            fos.close();
            inputStream.close();
            socket.close();
            System.out.println("Download complete.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}