import java.net.*;
import java.io.*;

public class DaytimeServer
{
public static final int SERVICE_PORT = 13;

public static void main(String args[])
{
try
{
// 绑定到服务端口，给客户端授予访问TCP daytime服务的权限
ServerSocket server = new ServerSocket
(SERVICE_PORT);

System.out.println ("Daytime service started");

// 无限循环，接受客户端
for (;;)
{
// 获取下一个TCP客户端
Socket nextClient = server.accept();

// 显示连接细节
System.out.println ("Received request from " +
nextClient.getInetAddress() + ":" +
nextClient.getPort() );

// 不读取数据，只是向消息写信息
OutputStream out =
nextClient.getOutputStream();
PrintStream pout = new PrintStream (out);

// 把当前数据显示给用户
pout.print( new java.util.Date() );

// 清除未发送的字节
out.flush();

// 关闭流
out.close();

// 关闭连接
nextClient.close();
}
}
catch (BindException be)
{
System.err.println ("Service already running on port " + SERVICE_PORT );
}
catch (IOException ioe)
{
System.err.println ("I/O error - " + ioe);
}
}
}