[网络协议]TCP（Socket）套接字实现客户端与服务端的交互，一次可以发送多条数据发

  // 升级版
        //客户端
        public class Climit {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("127.0.0.1",3023);

        new WriteThread("客户端：",socket).start();
        new ReadThead(socket).start();

        //发送信息,第一次握手
       /* OutputStream os = socket.getOutputStream();
        os.write("客户端：请求连接！".getBytes());
        //接收服务端的消息
        InputStream is = socket.getInputStream();
        byte[] b = new byte[1024];
        int read = is.read(b);
        System.out.println(new java.lang.String(b,0,read));

        socket.close();*/
    }
}

        //服务端
        public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(3023);
        //接收消息
        Socket accept = serverSocket.accept();
        new WriteThread("服务端：",accept).start();
        new ReadThead(accept).start();

       /* InputStream is = accept.getInputStream();
        byte[] b = new byte[1024];
        int len = is.read(b);
        System.out.println(new java.lang.String(b,0,len));

            //给客户端做出回应
            OutputStream os = accept.getOutputStream();
            os.write("服务端：怎么了！".getBytes());

            serverSocket.close();*/
        }
    }
    
    //多线程
    //读
    public class ReadThead extends Thread{
    private InputStream is;
    private Socket socket;
    public ReadThead(Socket socket) throws IOException {
        this.socket = socket;
        this.is = socket.getInputStream();
    }

    @Override
    public void run() {
        byte[] b = new byte[1024];
        try {
            while (true){
                int len = is.read(b);
            System.out.println(new String(b, 0, len));
        }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
            IOUtils.closeAll(is,socket);
        }
    }

    //（写）
    public class WriteThread extends Thread{
    //private Scanner sc  = new Scanner(System.in);
    private String name;
    //private OutputStream os;
    private BufferedWriter bw;
    private BufferedReader br;
    private Socket socket;
    public WriteThread(String name,Socket socket) throws IOException {
        this.name = name;
        this.socket = socket;
        //this.os = socket.getOutputStream();
        this.bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
        //通过转换流把标准输入流装换成字符流
        this.br = new BufferedReader(new InputStreamReader(System.in));
    }

    @Override
    public void run() {
        try {
            while (true) {
                //os.write((name + ";" + sc.nextLine()).getBytes());
                bw.write(name+":"+br.readLine());
                bw.newLine();
                bw.flush();
            }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
            IOUtils.closeAll(bw,socket);
        }
    }
}