努力打卡 每天学习 不浪费每一天 Day43

InetAddress

 

public static void main(String[] args) {
        try {
             //获取本机地址IP
            InetAddress ip1=InetAddress.getLocalHost();
            System.out.println(ip1.getHostName());
            System.out.println(ip1.getHostAddress());
            //获取域名IP对象
            InetAddress ip2=InetAddress.getByName("www.baidu.com");
            System.out.println(ip2.getHostName());
            System.out.println(ip2.getHostAddress());
            //获取公网ip对象
            InetAddress ip3=InetAddress.getByName("220.181.38.150");
            System.out.println(ip3.getHostName());
            System.out.println(ip3.getHostAddress());
            //判断是否能通,ping 5s内是否可通
            System.out.println(ip2.isReachable(5000));
        } catch (UnknownHostException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

  端口号 

协议

 

 

 

 

 

 停电了 我真服了  电脑很快就没电!! 
算了 明天早起继续学!