Client

package com.text.A07text.text2;

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

public class Client {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("127.0.0.1", 10000);

        // 2.读取本地文件并写入服务器中
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("untitled\\src\\com\\text\\A07text\\text2"));
        BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());
        byte[] bytes = new byte[1024];
        int len;
        while ((len = bis.read(bytes)) != -1) {
            bos.write(bytes, 0, len);
        }
        // 往服务器写出结束标记
        socket.shutdownOutput();

        // 接收服务器的回写数据
        BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        String line = br.readLine();
        System.out.println(line);

        socket.close();
    }
}

Server

package com.text.A07text.text2;

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

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket ss = new ServerSocket(10000);

        while (true) {
            Socket socket = ss.accept();
            // 开启一条线程
            // 一个用户对应服务端的一条线程
            new Thread(new MyRunnable(socket)).start();
        }
    }
}

Myrunnable

package com.text.A07text.text2;

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

public class MyRunnable implements Runnable {
    Socket socket;
    public MyRunnable(Socket socket) {
        this.socket = socket;
    }

    @Override
    public void run() {
        try {
            BufferedInputStream bis = new BufferedInputStream(socket.getInputStream());
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("untitled\\src\\com\\text\\A07text\\text2\\微信图片_20240310191552.jpg"));

            int len;
            byte[] bytes = new byte[1024];
            while ((len = bis.read(bytes)) != -1) {
                bos.write(bytes, 0, len);
            }
            //回写数据
            BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
            bw.write("上传成功");
            bw.newLine();
            bw.flush();

        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            //5. 释放资源
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}