在Java编程中，如何从IP地址查询出主机名？

以下示例显示了如何通过net.InetAddress类的InetAddress.getByName()方法将指定的IP地址查到主机名称。

package com.yiibai;


import java.net.InetAddress;

public class HostSpecificByIP {
   public static void main(String[] argv) throws Exception {
      InetAddress addr = InetAddress.getByName("www.yiibai.com");
      System.out.println("Host name is: "+addr.getHostName());
      System.out.println("Ip address is: "+ addr.getHostAddress());
   }
}

上述代码示例将产生以下结果 -

Host name is: www.yiibai.com
Ip address is: 112.124.103.85

示例-2

从IP地址查找主机名的另一个示例：

package com.yiibai;

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

public class HostSpecificByIP2 {
    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();
        }
    }
}

上述代码示例将产生以下结果(输出页面源代码) -

Your current IP address : YB-PC/192.168.1.50
Your current Hostname : YB-PC

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