package javaNet_TCP;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.net.ServerSocket;

import java.net.Socket;

import java.nio.charset.StandardCharsets;

import java.time.LocalDateTime;

public class TCPServer {

public static void main(String[] args) throws Exception {

ServerSocket ss = new ServerSocket(9090);

System.out.println("TCP server ready.");

Socket sock = ss.accept();//返回新建立的客户端连接

try (BufferedReader reader = new BufferedReader(

new InputStreamReader(sock.getInputStream(), StandardCharsets.UTF_8))){

try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(sock.getOutputStream()))){

String cmd = reader.readLine();

if ("time".equals(cmd)){

writer.write(LocalDateTime.now().toString()+"\n");

writer.flush();

} else {

writer.write("Sorry?\n");

writer.flush();//以流的形式先写入缓存区，满了才发送到网络上，使用flush强制发送

}

}

}

sock.close();

ss.close();

}

}