Java 示例 - 主机特定 IP 地址

  • 问题描述

    如何从 IP 地址中查找主机名?
  • 解决方案

    以下示例显示了如何借助 net.InetAddress 类的 InetAddress.getByName() 方法将主机名更改为其特定的 IP 地址。
    
    import java.net.InetAddress;
    public class Main {
       public static void main(String[] argv) throws Exception {
          InetAddress addr = InetAddress.getByName("74.125.67.100");
          System.out.println("Host name is: "+addr.getHostName());
          System.out.println("Ip address is: "+ addr.getHostAddress());
       }
    }
    
  • 结果

    上面的代码示例将产生以下结果。
    
    Host name is: 100.67.125.74.bc.googleusercontent.com
    Ip address is: 74.125.67.100
    
    以下是从 IP 地址查找主机名的示例
    
    import java.net.InetAddress;
    import java.net.UnknownHostException;
    public class NewClass1 {
       public static void main(String[] args) {
          InetAddress ip;
          String hostname;
          try {
             ip = InetAddress.getLocalHost();
             hostname = ip.getHostName();
             System.out.println("Your current IP address : " + ip);
             System.out.println("Your current Hostname : " + hostname);
          } catch (UnknownHostException e) {
             e.printStackTrace();
          }
       }
    }
    
    上面的代码示例将产生以下结果。
    
    Your current IP address : localhost/127.0.0.1
    Your current Hostname : localhost