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获取当前IP地址的Java代码实现

获取当前IP地址是Java开发中常见需求之一,本文将从以下多个方面对获取当前IP地址的Java代码实现做详细的阐述。

一、使用Inet4Address获取当前IP地址

Inet4Address是Java中一个用于表示IPv4地址的类,可以通过该类获取当前主机的IP地址。

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

public class InetAddressUtil {
    public static void main(String[] args) throws UnknownHostException {
        InetAddress inetAddress = InetAddress.getLocalHost();
        System.out.println("当前IP地址为:" + inetAddress.getHostAddress());
    }
}

通过调用getHostAddress()方法即可获取当前主机的IP地址。

二、使用NetworkInterface获取当前IP地址

除了Inet4Address,还可以使用Java提供的NetworkInterface类获取当前主机的IP地址。

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

public class NetworkInterfaceUtil {
    public static void main(String[] args) throws SocketException {
        Enumeration networkInterfaces = NetworkInterface.getNetworkInterfaces();
        while (networkInterfaces.hasMoreElements()) {
            NetworkInterface networkInterface = networkInterfaces.nextElement();
            Enumeration
    inetAddresses = networkInterface.getInetAddresses();
            while (inetAddresses.hasMoreElements()) {
                InetAddress inetAddress = inetAddresses.nextElement();
                System.out.println("当前IP地址为:" + inetAddress.getHostAddress());
            }
        }
    }
}

   
  

通过NetworkInterface获取所有的网络接口,再通过网络接口获取所有的IP地址。

三、使用HttpClient发送GET请求获取当前IP地址

除了使用Java自带的类获取IP地址,还可以通过HttpClient发送GET请求获取当前主机的IP地址。

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;

public class HttpClientUtil {
    public static void main(String[] args) throws IOException {
        HttpClient httpClient = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet("http://myip.ipip.net/");
        HttpResponse httpResponse = httpClient.execute(httpGet);
        HttpEntity httpEntity = httpResponse.getEntity();
        String result = EntityUtils.toString(httpEntity);
        String ip = result.substring(result.indexOf("[") + 1, result.indexOf("]"));
        System.out.println("当前IP地址为:" + ip);
    }
}

通过发送GET请求至http://myip.ipip.net/,并从返回结果中解析出当前主机的IP地址。

四、使用Java获取其它网络信息

除了获取当前IP地址,还可以使用Java获取其它网络信息,例如:本机的MAC地址、域名、端口等。

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

public class NetworkInfoUtil {
    public static void main(String[] args) throws UnknownHostException {
        InetAddress inetAddress = InetAddress.getLocalHost();
        System.out.println("当前主机名为:" + inetAddress.getHostName());
        System.out.println("当前主机的IP地址为:" + inetAddress.getHostAddress());

        Enumeration networkInterfaces = NetworkInterface.getNetworkInterfaces();

        while (networkInterfaces.hasMoreElements()) {
            NetworkInterface networkInterface = (NetworkInterface) networkInterfaces.nextElement();
            byte[] macBytes = networkInterface.getHardwareAddress();
            if (macBytes != null) {
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < macBytes.length; i++) {
                    sb.append(String.format("%02X%s", macBytes[i], (i < macBytes.length - 1) ? "-" : ""));
                }
                System.out.println("当前主机的MAC地址为:" + sb.toString());
            }

            Enumeration inetAddresses = networkInterface.getInetAddresses();
            while (inetAddresses.hasMoreElements()) {
                InetAddress address = (InetAddress) inetAddresses.nextElement();
                System.out.println("当前主机的域名为:" + address.getHostName());
                System.out.println("当前主机的端口号为:" + networkInterface.getMTU());
            }
        }
    }
}

通过调用相应的方法即可获取相应的网络信息。

总结

本文从使用Inet4Address获取IP地址、使用NetworkInterface获取IP地址、使用HttpClient发送GET请求获取IP地址、使用Java获取其它网络信息等多个方面对获取当前IP地址的Java代码实现进行了详细的阐述。在实际开发中,可以根据需求选择相应的方式来获取IP地址。