Java如何根据主机名（域名）获取IP地址？

在Java编程中，如何根据主机名(域名)获取IP地址？

以下示例显示了如何通过net.InetAddress类的InetAddress.getByName()方法将主机名更改为指定的IP地址。

package com.yiibai;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class HostSpecificIPAddress {
   public static void main(String[] args) {
      InetAddress address = null;
      try {
         address = InetAddress.getByName("www.yiibai.com");
      } catch (UnknownHostException e) {
         System.exit(2);
      }
      System.out.println(address.getHostName() + " IP is = " + address.getHostAddress());
      System.exit(0);
   }
}

上述代码示例将产生以下结果 -

www.yiibai.com IP is = 112.124.103.85

示例-2

以下是Java中使用getHostAddress()和getHostName()获取本机的另一个示例 -

package com.yiibai;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class HostSpecificIPAddress2 {
    public static void main(String[] args) {
        InetAddress ipadd;
        String hostname;
        try {
            ipadd = InetAddress.getLocalHost();
            hostname = ipadd.getHostName();
            System.out.println("Your IP address : " + ipadd);
            System.out.println("Your Hostname : " + hostname);
        } catch (UnknownHostException e) {
        }
    }
}

上述代码示例将产生以下结果 -

Your IP address : Yiibai-PC/192.168.1.50
Your Hostname : Yiibai-PC