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java如何获取ip

2026-03-03 06:35:03Java

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("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.*;
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();
                    if (!address.isLoopbackAddress() && address instanceof Inet4Address) {
                        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，可以通过HttpServletRequest获取客户端的IP地址：

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.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }
}

获取公网IP地址

要获取设备的公网IP地址，可以调用外部API服务：

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

public class PublicIP {
    public static void main(String[] args) {
        try {
            URL whatismyip = new URL("http://checkip.amazonaws.com");
            BufferedReader in = new BufferedReader(new InputStreamReader(whatismyip.openStream()));
            String ip = in.readLine();
            System.out.println("Public IP Address: " + ip);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}