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java如何获取ip

2026-02-04 19:23:32Java

获取本地IP地址

使用InetAddress类可以获取本地主机的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("本地IP地址: " + localHost.getHostAddress());
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
}

获取客户端IP地址（Web应用）

在Servlet或Spring Boot应用中，可以通过HttpServletRequest获取客户端IP：

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;
    }
}

获取所有网络接口的IP地址

使用NetworkInterface类可以枚举所有网络接口及其IP地址：

java如何获取ip

import java.net.*;
import java.util.Enumeration;

public class AllIPs {
    public static void main(String[] args) throws SocketException {
        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
        while (interfaces.hasMoreElements()) {
            NetworkInterface iface = interfaces.nextElement();
            Enumeration<InetAddress> addresses = iface.getInetAddresses();
            while (addresses.hasMoreElements()) {
                InetAddress addr = addresses.nextElement();
                System.out.println("接口 " + iface.getName() + " IP: " + addr.getHostAddress());
            }
        }
    }
}