java网络编程TCP

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

//服务端
public class MyServer {
    
    public static void main(String[] args) {
        ServerSocket serverSocket = null;
        Socket socket = null;
        try {
            //创建监听1515端口的ServerSocket对象
            serverSocket = new ServerSocket(1515);
            //堵塞等待客户端的请求，当收到请求就返回Socket对象
            socket = serverSocket.accept();
            //从Socket对象获取输入流和输出流
            InputStream in = socket.getInputStream();
            OutputStream out = socket.getOutputStream();
            //通过输入流读取客户端发送的数据
            byte[] bt = new byte[1024];
            int len = in.read(bt);
            String data = new String(bt, 0, len);
            System.out.println(data);
            //通过输出流向客户端返回数据
            out.write("服务器已收到！！！".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //关闭资源
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (serverSocket != null) {
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

//客户端
public class MyClient {

    public static void main(String[] args) {
        Socket socket = null;
        try {
            //创建连接服务端的Socket对象
            socket = new Socket("127.0.0.1", 1515);
            //从Socket对象获取输入流和输出流
            InputStream in = socket.getInputStream();
            OutputStream out = socket.getOutputStream();
            //通过输出流向服务端发送数据
            out.write("来自客户端！！！".getBytes());
            //通过输入流读取服务端返回的数据
            byte[] bt = new byte[1024];
            int len = in.read(bt);
            String data = new String(bt, 0, len);
            System.out.println(data);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //关闭资源
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}