Java：获取本机所有IP地址，内网IP

获取IP地址

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;

public class TestGetIP {

public static void main(String[] args) {

TestGetIP testGetIP = new TestGetIP();
testGetIP.printAddresses();

System.out.println("\n\n\n\n");

System.out.println(testGetIP.getIP());

}

// 找一个合理的ipv4
public String getIP() {
try {
// 根据hostname找ip
InetAddress address = InetAddress.getLocalHost();
if (address.isLoopbackAddress()) {
Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
while (allNetInterfaces.hasMoreElements()) {
NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
while (addresses.hasMoreElements()) {
InetAddress ip = addresses.nextElement();
if (!ip.isLinkLocalAddress() && !ip.isLoopbackAddress() && ip instanceof Inet4Address) {
return ip.getHostAddress();
}
}
}
}
return address.getHostAddress();
} catch (UnknownHostException e) {
e.printStackTrace();
return null;
} catch (SocketException e) {
e.printStackTrace();
return null;
}
}

// 所有网络接口
public void printAddresses() {
try {
Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
while (allNetInterfaces.hasMoreElements()) {
NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();

// 去除回环接口，子接口，未运行和接口
if (netInterface.isLoopback() || netInterface.isVirtual() || !netInterface.isUp()) {
continue;
}

Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
while (addresses.hasMoreElements()) {
InetAddress ip = addresses.nextElement();
if (ip != null) {

System.out.println("ip = " + ip.getHostAddress());
// ipv4
if (ip instanceof Inet4Address) {
System.out.println("ipv4 = " + ip.getHostAddress());

if (ip.getHostAddress().startsWith("192") || ip.getHostAddress().startsWith("10")
|| ip.getHostAddress().startsWith("172") || ip.getHostAddress().startsWith("169")) {
// 内网
}
}
}
}
}
} catch (SocketException e) {
System.err.println("Error when getting host ip address"+ e.getMessage());
}
}
}