InetAddress

java.net.InetAddress：主要作用是封装 IP 及 DNS ，这个类没有构造方法

1、获取 InetAdderss 对象

  • InetAddress.getLocalHost()：获得本机的 InetAddress 对象
  • InetAddress.getByName(“www.baidu.com”)：根据域名得到 InetAddress 对象
  • InetAddress.getByName(“113.13.100.113”)：根据 IP 得到 InetAddress 对象

2、获取主机地址

  • InetAddress.getHostAddress()：获取主机地址字符串

  • InetAddress.getHostName()：获取主机名称 ```java public class Demo { public static void main(String[] args) throws CharacterCodingException, UnknownHostException {

    1.   // 1.获得本机的InetAddress对象
    2.   InetAddress localHost = InetAddress.getLocalHost();
    3.   print(localHost);
    5.   // 2.通过域名获取InetAddress对象
    6.   InetAddress baidu = InetAddress.getByName("www.baidu.com");
    7.   print(baidu);
    9.   // 3.通过IP获取InetAddress对象
    10.   InetAddress inetAddress = InetAddress.getByName("14.215.177.38");
    11.   print(inetAddress);

    }

    private static void print(InetAddress inetAddress) {

    1.   System.out.println(inetAddress.getHostName());
    2.   System.out.println(inetAddress.getHostAddress());

    } }

// 输出： DESKTOP-NJ2O5D6 172.30.80.1 // 获取本机的IP地址 www.baidu.com 14.215.177.38 14.215.177.38 // DNS不给解析，返回IP地址本身 14.215.177.38

  2. <a name="KyeT6"></a>
  3. #### InetSocketAddress
  5. InetSocketAddress类的主要作用是封装端口，继承了 InetAddress 类
  7. InetSocketAddress类的构造方法：
  9. - InetSocketAddress(InetAddress addr, int port)：根据 IP 地址和端口号创建套接字地址
  10. - InetSocketAddress(String hostname, int port)：根据主机名和端口号创建套接字地址
  12. InetSocketAddress类的常用方法：
  14. - getAddress()：获取 InetAddress
  15. - getPort()：获取端口号
  16. - toString()：构造 InetSocketAddress 的字符串形式，主机名/IP:端口号
  17. - getHostName()：获取主机名3
  18. ```java
  19. InetSocketAddress address = new InetSocketAddress(InetAddress.getLocalHost(), 10000);
  20. System.out.println(address.getPort());      // 10000
  21. System.out.println(address.getHostName());  // DESKTOP-NJ2O5D6
  22. System.out.println(address.getAddress());   // DESKTOP-NJ2O5D6/172.30.80.11
  23. System.out.println(address.toString());     // DESKTOP-NJ2O5D6/172.30.80.11:10000