获取本地 ip (多网卡的情况下)

public String getLocalHostName() {
String hostName;
try {
InetAddress addr = InetAddress.getLocalHost();
hostName = addr.getHostAddress();
} catch (Exception ex) {
hostName = "";
}
return hostName;
}

public String[] getAllLocalHostIP() {
String[] ret = null;
try {
String hostName = getLocalHostName();
if (hostName.length() > 0) {
InetAddress[] addrs = InetAddress.getAllByName(hostName);
if (addrs.length > 0) {
ret = new String[addrs.length];
for (int i = 0; i < addrs.length; i++) {
ret[i] = addrs[i].getHostAddress();
}
}
}

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