Detailed explanation of example code for one-way communication in Java

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

public class MyTcp {
	private BufferedReader reader;
	private ServerSocket server;
	private Socket socket;
	void getserver() {
		try {
			server = new ServerSocket(8998);
			System.out.println("服务器套接字已经创建成功");
			while(true) {
				System.out.println("等待客户机的连接");
				socket = server.accept();
				reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
				getClienMessage();
			}
		}catch(Exception e) {
			e.printStackTrace();
		}
		
	}
	private void getClienMessage() {
		try {
			while (true) {
				System.out.println("客户机："+ reader.readLine());
			}
		}catch(Exception e) {
			e.printStackTrace();
		}
		try {
			if(reader !=null) {
				reader.close();
			}
			if(socket !=null) {
				socket.close();
			}
		}catch(IOException e) {
			e.printStackTrace();
		}
	}
	public static void main(String[] args) {
		MyTcp tcp = new MyTcp();
		tcp.getserver();
	}
}

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.PrintWriter;
import java.net.Socket;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.border.BevelBorder;

public class MyClien extends JFrame{
	private PrintWriter writer;
	Socket socket;
	private JTextArea ta = new JTextArea();
	private JTextField tf = new JTextField();
	Container cc;
	public MyClien(String title) {
		super(title);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		cc = this.getContentPane();
		final JScrollPane scrollPane = new JScrollPane();
		scrollPane.setBorder(new BevelBorder(BevelBorder.RAISED));
		getContentPane().add(scrollPane, BorderLayout.CENTER);
		scrollPane.setViewportView(ta);
		cc.add(tf,"South");
		tf.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				writer.println(tf.getText());
				ta.append(tf.getText()+ '\n');
				ta.setSelectionEnd(ta.getText().length());
				tf.setText("");
			}
		});
	}
		private void connect() {
			ta.append("尝试连接\n");
			try {
				socket = new Socket("127.0.0.1",8998);
				writer = new PrintWriter(socket.getOutputStream(),true);
				ta.append("完成连接\n");
			}catch(Exception e) {
				e.printStackTrace();
			}
		}
		public static void main(String[] args) {
			MyClien clien = new MyClien("向服务器传送数据");
			clien.setSize(200,200);
			clien.setVisible(true);
			clien.connect();
		}
	}