在Java中查找 URL 的 IP 地址

先决条件：InetAddress
getByName() ：返回给定主机的 InetAddress。如果主机是字面量IP 地址，则只检查其有效性。获取指定主机的公共 IP 地址。它将主机作为参数并返回相应的 IP 地址。

例子：

Input : www.google.com
Output : 216.58.199.164

Input : localhost
Output : 127.0.0.1

下面的程序说明了如何获取公共 IP 地址：

注意：这些程序不会在在线编译器上运行。请改用 Netbeans、Eclipse 等离线编译器。

程序 1：获取任意 URL 的 IP 地址

Java

// Java program to demonstrate
// how to fetch public IP Address
import java.net.*;
import java.*;
 
class GFG {
    public static void main(String args[])
        throws UnknownHostException
    {
        // The URL for which IP address needs to be fetched
        String s = "https:// www.google.com/";
 
        try {
            // Fetch IP address by getByName()
            InetAddress ip = InetAddress.getByName(new URL(s)
                                                       .getHost());
 
            // Print the IP address
            System.out.println("Public IP Address of: " + ip);
        }
        catch (MalformedURLException e) {
            // It means the URL is invalid
            System.out.println("Invalid URL");
        }
    }
}

输出：

Public IP Address of: www.google.com/216.58.196.164

程序2：获取系统的公共IP地址
要查找公共 IP，请使用 http://bot.whatismyipaddress.com。它是一个在线实用程序，用于查找系统的公共 IP。打开 URL，读取一行并打印该行。

Java

// Java program to demonstrate
// how to fetch public IP Address
import java.net.*;
import java.*;
 
class GFG {
    public static void main(String args[])
        throws UnknownHostException
    {
        String systemipaddress = "";
        try {
            URL url_name = new URL("http://bot.whatismyipaddress.com");
 
            BufferedReader sc = new BufferedReader(
                new InputStreamReader(url_name.openStream()));
 
            // reads system IPAddress
            systemipaddress = sc.readLine().trim();
        }
        catch (Exception e) {
            systemipaddress = "Cannot Execute Properly";
        }
        // Print IP address
        System.out.println("Public IP Address: "
                           + systemipaddress + "\n");
    }
}

输出：

Public IP Address: 103.62.239.242