java Socket通信

public class Server {

    public static void main(String[] args) throws IOException {
        createServer();
    }

    private static void createServer() throws IOException {
        //1.创建服务端socket,监听端口
        ServerSocket server = new ServerSocket(8888);
        //2.死循环等待客户端连接
        Socket client = null;
        while(true){
            //3.获取客户端连接来的socket
            client = server.accept();
            if(client !=null){
                System.out.println("客户端连接来了");
                //4.获取客户端输入并读取出来
                BufferedReader read = new BufferedReader(new InputStreamReader(client.getInputStream()));
                System.out.println(read.readLine());
                read.close();
            }
        }
    }
    
    
}

public class Client {

    
    public static void main(String[] args) throws IOException {
        createClient();
    }

    private static void createClient() throws UnknownHostException, IOException {
        //创建客户端
        Socket client = new Socket("127.0.0.1", 8888);
        
        //客户端连接服务端
//        SocketAddress endpoint = new InetSocketAddress("127.0.0.1", 8888);
        OutputStream os = client.getOutputStream();
        OutputStreamWriter osw = new OutputStreamWriter(os, "UTF-8");
        BufferedWriter bw = new BufferedWriter(osw);
        bw.write("hello");
        bw.flush();
        os.close();
        osw.close();
    }
}