当前位置：首页 > Java

java 如何获取ip

2026-03-26 05:34:13Java

获取本地 IP 地址

在 Java 中可以通过 InetAddress 类获取本地主机的 IP 地址。以下是示例代码：

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

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

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

public class AllIPs {
    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();
        }
    }
}

获取客户端 IP 地址（Web 应用）

在 Web 应用中获取客户端的 IP 地址可以通过 HttpServletRequest 对象：

import javax.servlet.http.HttpServletRequest;

public class ClientIP {
    public static String getClientIp(HttpServletRequest request) {
        String ip = request.getHeader("X-Forwarded-For");
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }
}

获取公网 IP 地址

如果需要获取本机的公网 IP 地址，可以通过调用外部 API 服务：

java 如何获取ip

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

public class PublicIP {
    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 (Exception e) {
            e.printStackTrace();
        }
    }
}