Java获取本地IP （windos平台、linux平台）

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

public final class StringUtil {

public static void main(String[] args) {
System.out.println("get local ip for windows: ");
printList(getAllLocalHostIPForWin());

System.out.println();
System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
System.out.println();

System.out.println("get local ip for linux: ");
printList(getAllLocalHostIPForLinux());
}

/**
* @return
*/
private static String getLocalHostName() {
String hostName;
try {
InetAddress addr = InetAddress.getLocalHost();
hostName = addr.getHostName();
} catch (Exception ex) {
hostName = "";
}
return hostName;
}

/**
* @return
*/
public static List<String> getAllLocalHostIPForWin() {
List<String> ret = new ArrayList<String>();
try {
String hostName = getLocalHostName();
if (hostName.length() > 0) {
InetAddress[] addrs = InetAddress.getAllByName(hostName);
if (addrs.length > 0) {
for (int i = 0; i < addrs.length; i++) {
ret.add(addrs[i].getHostName() + "  ->  " + addrs[i].getHostAddress());
}
}
}

} catch (Exception ex) {
ret = null;
}
return ret;
}

// 上面这个方法在linux平台上将只能获取 127.0.0.1
// 为了获取到linux上的IP地址，请使用下面的方法。
// 但下面的这个方法也可用于windows平台，但获取的信息比真实的网卡信息要多。请自行分辨。

/**
* @return
*/
public static List<String> getAllLocalHostIPForLinux() {
List<String> ret = new ArrayList<String>();
try {
Enumeration<?> e1 = (Enumeration<?>) NetworkInterface.getNetworkInterfaces();
NetworkInterface ni = null;
while (e1.hasMoreElements()) {
ni = (NetworkInterface) e1.nextElement();
Enumeration<?> e2 = ni.getInetAddresses();
InetAddress ia = null;
while (e2.hasMoreElements()) {
ia = (InetAddress) e2.nextElement();
ret.add(ia.getHostName() + "  ->  " + ia.getHostAddress());
}

}

} catch (SocketException e) {
e.printStackTrace();
}

return ret;
}

/**
*
* @param list
*/
public static void printList(List<String> list) {
for (String ele : list) {
System.out.println(ele);
}
}
}