客戶端程式碼如下：

import java.io.*;
import java.net.*;
public class DailyAdviceClient {
	public void go(){
			
		try {
			Socket s=new Socket("127.0.0.1",4242);//建立對伺服器的Socket連線
			//客戶端從伺服器讀取資料
			//建立連線到socket上低層輸入串流的InputStreamReader
			//InputStreamReader是低層和高層串流間的橋樑
			//s.getInputStream()從Socket取得輸入串流
			InputStreamReader streamReader=new InputStreamReader(s.getInputStream());
			//建立BufferedReader來讀取
			BufferedReader reader=new BufferedReader(streamReader);
			String adviceString=reader.readLine();
			System.out.println("Today you should: "+adviceString);	
			//客戶端向伺服器傳送資料	
			//建立不帶自動行重新整理的PrintWriter物件，
			//如果新增第二個引數true,則為自動重新整理，不需要寫writer.flush()這行程式碼	
			PrintWriter writer=new PrintWriter(s.getOutputStream());
			writer.println("Hello,I am Client2!");
			writer.flush();//刷新發送資料
			System.out.println("此套接字連線的遠端地址："+s.getInetAddress().getHostAddress());
			System.out.println("此套接字繫結的本地地址："+s.getLocalAddress().getHostAddress());
			System.out.println("此套接字繫結的本地埠:"+s.getLocalPort());
			System.out.println("此套接字連線到的遠端埠:"+s.getPort());
			s.close();//關閉socket
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	public static void main(String[]args){
		DailyAdviceClient client=new DailyAdviceClient();
		client.go();
	}
}
 

import java.io.*;
import java.net.*;
public class DailyAdviceServer {
	String[] adviceList={"Take smaller bites","One word: inappropriate",""
			+ "Just for today,be honest","Tell your boss"};
	public void go(){
		
		try {
			//伺服器應用程式對特定埠創建出ServerSocket物件
			//這會讓伺服器應用程式監聽來自4242埠的客戶端請求
			ServerSocket serverSocket=new ServerSocket(4242);
			//伺服器進入無窮迴圈等待客戶端的請求
			while(true){
				System.out.println("等待客戶端連線...");
				//接收到使用者連線請求後，此方法會返回一個socket，以便於客戶端通訊
				//此socket的埠號和serverSocket的埠號不同
				Socket sock=serverSocket.accept();//此方法會阻塞直到有連線請求到達
				System.out.println("此套接字連線的地址："+sock.getInetAddress().getHostAddress());
				System.out.println("此套接字繫結的本地地址："+sock.getLocalAddress().getHostAddress());
				System.out.println("此套接字繫結的本地埠:"+sock.getLocalAddress());
				System.out.println("此套接字連線到的遠端埠:"+sock.getPort());
				//伺服器向客戶端傳送資料
				PrintWriter writer=new PrintWriter(sock.getOutputStream());
				String adviceString=getAdvice();
				writer.println(adviceString);
				writer.flush();
				System.out.println(adviceString);
				//伺服器接收客戶端傳送的資料
				InputStreamReader streamReader=new InputStreamReader(sock.getInputStream());
				BufferedReader reader=new BufferedReader(streamReader);
				String adviceStringREC=reader.readLine();
				System.out.println("REC: "+adviceStringREC);			

			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	public String getAdvice(){
		int random=(int)(Math.random()*adviceList.length);
		return adviceList[random];
		
	}
	public static void main(String []args){
		DailyAdviceServer server=new DailyAdviceServer();
		server.go();
	}
}