最简单的socket通讯服务器和客户端

底部附上了效果图
服务器代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(2000);
        System.out.println("服务器准备就绪");
        //System.out.println("client: "+ socket.getLocalAddress() + " p : " + socket.getLocalPort());
        System.out.println("服务器信息 ： " + serverSocket.getInetAddress() + " p : " + serverSocket.getLocalPort());

        //等待客户端连接
        while (true) {
            Socket client = serverSocket.accept();
            ClientHandler clientHandler = new ClientHandler(client);
            clientHandler.start();
        }
    }
    private static class ClientHandler extends Thread{
        private Socket socket;
        ClientHandler(Socket socket){
            this.socket = socket;
        }
        private boolean flag = true;

        @Override
        public void run() {
            //super.run();
            System.out.println("新客户端连接： " + socket.getInetAddress() + "p: " + socket.getPort());

            try {
                //得到打印流，用于数据输出；服务器回送数据使用
                PrintStream soketOutput = new PrintStream(socket.getOutputStream());
                //得到输入流，用于接收数据
                BufferedReader socketInput = new BufferedReader(
                        new InputStreamReader(socket.getInputStream()));
                do {
                    //客户端拿到一条数据
                    String str = socketInput.readLine();

                    //String echo = socketInput.readLine();
                    if ("bye".equalsIgnoreCase(str)) {
                        flag = false;
                        soketOutput.println("bye");
                    }else {
                        //打印到屏幕，并回送数据长度
                        System.out.println(str);
                        soketOutput.println("回送： " + str.length());
                    }
                }while (flag);
                socketInput.close();
                soketOutput.close();

            } catch (IOException e) {
                System.out.println("连接异常断开");
            }finally {
                //连接关闭
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            System.out.println("客户端已退出： " + socket.getInetAddress() + " p : " + socket.getPort());
        }
    }
}


客户端代码：
import java.io.*;
import java.net.Inet4Address;
import java.net.InetSocketAddress;
import java.net.Socket;

public class Client {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        socket.setSoTimeout(3000);
        //连接本地，端口2000；超时时间为3000ms
        socket.connect(new InetSocketAddress(Inet4Address.getLocalHost(),2000), 3000);
        System.out.println("服务器已连接");
        System.out.println("client: "+ socket.getLocalAddress() + " p : " + socket.getLocalPort());
        System.out.println("服务器信息 ： " + socket.getInetAddress() + " p : " + socket.getPort());
        try {
            todo(socket);
        }catch (Exception e){
            System.out.println("关闭异常");
        }
        socket.close();
        System.out.println("客户端已退出");
        
    }
    private static void todo(Socket client) throws IOException{
        InputStream in = System.in;
        BufferedReader input = new BufferedReader(new InputStreamReader(in));
        //得到soket输出流，并转换为打印流
        OutputStream outputStream = client.getOutputStream();
        PrintStream sockePrintStream = new PrintStream(outputStream);
        // 得到sokcet输入流，并转换为socketBufferReader
        InputStream inputStream = client.getInputStream();
        BufferedReader sokcetBufferedReader = new BufferedReader(new InputStreamReader(inputStream));

        boolean flag = true;
        do {
            //键盘读取一行
            String str = input.readLine();
            //发送到服务器
            sockePrintStream.println(str);

            //从服务器读取一行
            String echo = sokcetBufferedReader.readLine();
            if ("bye".equalsIgnoreCase(echo)) {
                flag = false;
            }else {
                System.out.println(echo);
            }
        }while (flag);
        //关闭socket流
        sockePrintStream.close();
        sokcetBufferedReader.close();
    }
}