ServerSocket serverSocket = new ServerSocket(8000);

Socket socket = serverSocket.accept();

InputStream input = socket.getInputStream();

InputStreamReader reader = new InputStreamReader(input);
int character = reader.read();  // reads a single character

BufferedReader reader = new BufferedReader(new InputStreamReader(input));
String line = reader.readLine();    // reads a line of text

OutputStream output = socket.getOutputStream();

PrintWriter writer = new PrintWriter(output, true);
writer.println(“This is a message sent to the server”);

socket.close();

serverSocket.close();

package com.woolbro.dev.socket.Client;

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

public class TimeClient {

    public static void main(String[] args) {
        if (args.length < 2) {
            System.out.println("#######Need More Arguments #########");
            return;
        }

        String hostname = args[0];
        int port = Integer.parseInt(args[1]);
        for (int i = 0; i < 10; i++) {
            try (Socket socket = new Socket(hostname, port)) {
                OutputStream out = socket.getOutputStream();
                String realStr = "This is woolbro dev Test";
                out.write(realStr.getBytes());
                InputStream input = socket.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(input));

                String time = reader.readLine();

                System.out.println(time);

            } catch (UnknownHostException ex) {

                System.out.println("Server not found: " + ex.getMessage());

            } catch (IOException ex) {

                System.out.println("I/O error: " + ex.getMessage());
            }
        }

    }

}

package com.woolbro.dev.socket.Server;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Date;

public class TimeServer {

    public static void main(String[] args) {
        if (args.length < 1) {
            System.out.println("######## Argument is Null ########");
            return ;
        }
        
        int port = Integer.parseInt(args[0]);
 
        try (ServerSocket serverSocket = new ServerSocket(port)) {
 
            System.out.println("Server is listening on port " + port);
 
            while (true) {
                Socket socket = serverSocket.accept();
 
                System.out.println("[ "+socket.getInetAddress()+" ] client connected");
                OutputStream output = socket.getOutputStream();
                PrintWriter writer = new PrintWriter(output, true);
                writer.println(new Date().toString());

                InputStream input = socket.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(input));
                System.out.println("###### msg : "+reader.readLine());
            }
 
        } catch (IOException ex) {
            System.out.println("Server exception: " + ex.getMessage());
            ex.printStackTrace();
        }

    }

}