Daytime服务器

package serversocket;import java.net.*;import java.io.*;import java.util.*;import java.util.concurrent.*;// 时间协议服务器public class DaytimeServer {    private static final int PORT = 5001;// 端口    private final static int THREAD_COUNT = 50;// 线程数量    public static void main(String[] args) {        ExecutorService pool = Executors.newFixedThreadPool(THREAD_COUNT);        try (ServerSocket server = new ServerSocket(PORT)) {            while (true) {                // 嵌套try块是为了区分两类异常                try {                    Socket connection = server.accept();                    DaytimeTask task = new DaytimeTask(connection);                    pool.submit(task);                }catch(IOException e){                }            }        } catch (IOException e) {            System.err.println("Could't start server");        }    }}class DaytimeTask implements Callable<Void> {    private Socket connection;    DaytimeTask(Socket connection) {        this.connection = connection;    }    @Override    public Void call(){        try (Writer out = new OutputStreamWriter(connection.getOutputStream());) {                Date nowadays = new Date();                out.write(nowadays.toString() + "/r/n");                out.flush();            } catch (IOException e) {                e.printStackTrace();            }        return null;    }}