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Java重修笔记 InetAddress 类和 Socket 类

article 2024/10/21 9:58:54

InetAddress 类相关方法

1. 获取本机 InetAddress 对象：getLocalHost

public static InetAddress getLocalHost() throws UnknownHostException

返回值：本地主机的名字和地址

异常：UnknownHostException - 如果本地主机名无法解析成地址

2. 根据指定主机名/域名来获取 IP 地址对象：getByName

public static InetAddress getByName(String host) throws UnknownHostException

返回值：给定主机名的IP地址

异常：UnknownHostException - 如果没有找到 host IP地址，或者是否为全局IPv6地址指定了scope_id。
SecurityException - 如果安全管理器存在，并且其 checkConnect 方法不允许该操作

3. 根据 InetAddress 对象获取主机名：getHostName

public String getHostName()

4. 根据 InetAddress 对象获取地址：getHostAddress

public String getHostAddress()

public class API_ {
    public static void main(String[] args) throws UnknownHostException {
        // 获取本机的 InetAddress 对象
        InetAddress localHost = InetAddress.getLocalHost();
        System.out.println("localHost = " + localHost); // DESKTOP-L4UPSF9/192.168.1.4

        // 根据指定主机名/域名来获取 IP 地址对象：getByName
        InetAddress host1 = InetAddress.getByName("DESKTOP-L4UPSF9");
        System.out.println("host1 = " + host1); // DESKTOP-L4UPSF9/192.168.1.4
        InetAddress host2 = InetAddress.getByName("www.baidu.com");
        System.out.println("host2 = " + host2); // www.baidu.com/110.242.68.4

        // 根据 InetAddress 对象获取主机名 getHostName
        String hostName = host2.getHostName();
        System.out.println(hostName); // www.baidu.com

        // 根据 InetAddress 对象获取域名 getHostAddress
        String hostAddress = host2.getHostAddress();
        System.out.println(hostAddress); // 110.242.68.3
    }
}