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java如何查询ip

2026-03-25 05:01:09Java

查询本机IP地址

使用InetAddress类可以获取本机的IP地址。以下是一个简单的示例代码：

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

public class GetLocalIP {
    public static void main(String[] args) {
        try {
            InetAddress localHost = InetAddress.getLocalHost();
            System.out.println("Local IP Address: " + localHost.getHostAddress());
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
}

查询公网IP地址

查询公网IP需要访问外部服务。可以使用HTTP请求获取公网IP：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;

public class GetPublicIP {
    public static void main(String[] args) {
        try {
            URL url = new URL("https://api.ipify.org");
            BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));
            String publicIP = reader.readLine();
            System.out.println("Public IP Address: " + publicIP);
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

获取所有网络接口的IP地址

如果需要获取所有网络接口的IP地址，可以使用NetworkInterface类：

java如何查询ip

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class GetAllIPs {
    public static void main(String[] args) {
        try {
            Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
            while (interfaces.hasMoreElements()) {
                NetworkInterface networkInterface = interfaces.nextElement();
                Enumeration<InetAddress> addresses = networkInterface.getInetAddresses();
                while (addresses.hasMoreElements()) {
                    InetAddress address = addresses.nextElement();
                    System.out.println("Interface: " + networkInterface.getName() + 
                                      ", IP: " + address.getHostAddress());
                }
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }
}