public class Server {

    public static void main(String[] args) {
        
        try {
            ServerSocket serverSocket = new ServerSocket(8888);
            System.out.println("服務器啟動中....");
            //accept()是在一個套接口接受的一個連接。accept（）是c語言中網絡編程的重要的函數，
            //本函數從s的等待連接隊列中抽取第一個連接，創建一個與s同類的新的套接口並返回句柄。
 

            Socket socket = serverSocket.accept();//獲取Socket
            InputStream is = socket.getInputStream();//獲取輸入流
            InputStreamReader isr = new InputStreamReader(is);//InputStreamReader類是從字節流到字符流的橋接器
            BufferedReader br = new BufferedReader(isr);//緩沖流
            System.out.println("客戶端數據" + br.readLine());
            String info 
 
= null;
            while((info = br.readLine()) != null){
                System.out.println("客戶端傳遞的信息" + info);
            }
            socket.shutdownInput();//shutdownInput和shutdownOutput只關閉相應的輸入、輸出流，不會同時關閉網絡連接的功能。
            OutputStream os = socket.getOutputStream();
            PrintWriter pw 
 
= new PrintWriter(os);
            pw.write("歡迎您！！");
            pw.flush();//flush()是清空，而不是刷新    將緩沖區的內容輸出
            
            pw.close();
            os.close();
            br.close();
            isr.close();
            is.close();
            socket.close();
            serverSocket.close();
        } catch (IOException e) {
            System.out.println(e.getMessage());
            e.printStackTrace();
        }
        
    }
    
}

public class Client {
    
    public static void main(String[] args) {
        try {
            Socket socket = new Socket("localhost", 8888);
            System.out.println("客戶端啟動中....");
            OutputStream os = socket.getOutputStream();
            PrintWriter pw = new PrintWriter(os);
            pw.write("admin");
            pw.flush();
            socket.shutdownOutput();
            
            InputStream is = socket.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String info = null;
            while((info = br.readLine()) != null){
                System.out.println("服務端返回的信息" + info);
            }
            
            os.close();
            pw.close();
            is.close();
            br.close();
            socket.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

Socket通信實現步驟