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ip如何获取java

2026-03-25 21:55:17Java

IP 地址获取方法（Java）

在 Java 中获取 IP 地址可以通过多种方式实现，具体取决于需求场景（如获取本地 IP 或远程客户端 IP）。以下是常见方法：

获取本机 IP 地址

使用 InetAddress 类获取本机 IP 地址：

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

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

注意：getLocalHost() 可能返回环回地址（如 127.0.0.1），需遍历所有网络接口获取真实 IP：

ip如何获取java

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

public class RealLocalIP {
    public static void main(String[] args) throws SocketException {
        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
        while (interfaces.hasMoreElements()) {
            NetworkInterface iface = interfaces.nextElement();
            if (iface.isLoopback() || !iface.isUp()) continue;
            Enumeration<InetAddress> addresses = iface.getInetAddresses();
            while (addresses.hasMoreElements()) {
                InetAddress addr = addresses.nextElement();
                if (addr instanceof Inet4Address) {
                    System.out.println("Local IPv4: " + addr.getHostAddress());
                }
            }
        }
    }
}

获取客户端 IP（Web 应用）

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

import javax.servlet.http.HttpServletRequest;

public class ClientIPUtils {
    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;
    }
}

说明：需处理代理和负载均衡场景（如 X-Forwarded-For 头）。

ip如何获取java

获取公网 IP（通过外部 API）

调用第三方服务获取本机公网 IP：

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

public class PublicIPFetcher {
    public static void main(String[] args) throws Exception {
        URL whatIsMyIP = new URL("http://checkip.amazonaws.com");
        BufferedReader in = new BufferedReader(new InputStreamReader(whatIsMyIP.openStream()));
        System.out.println("Public IP: " + in.readLine());
    }
}

备选 API：