import com.pi4j.system.NetworkInfo; //导入依赖的package包/类
public PlaySongHttpHandler()
{
    logger = Logger.getLogger(getClass().getName());
    try 
    {
        System.out.println("Hostname          :  " + NetworkInfo.getHostname());
        
        for (String ipAddress : NetworkInfo.getIPAddresses())
        {
            System.out.println("IP Addresses      :  " + ipAddress);
        }
    } 
    catch (Exception ex) 
    {
        Logger.getLogger(PlaySongHttpHandler.class.getName()).log(Level.SEVERE, null, ex);
    }
    
    String osName = SystemInfo.getOsName();
    System.out.println("OS Name           :  " + osName);
    if(osName.contains("Mac") ||
            osName.contains("Windows"))
    {
        System.out.println("The application is NOT running on Raspberry Pi.");
    }
    else
    {
        rtttlService = new RtttlService();
    }
}
 

import com.pi4j.system.NetworkInfo; //导入依赖的package包/类
public String getHostname() throws IOException, InterruptedException {
   return NetworkInfo.getHostname();
}
 

import com.pi4j.system.NetworkInfo; //导入依赖的package包/类
public String[] getIPAddresses() throws IOException, InterruptedException {
   return NetworkInfo.getIPAddresses();
}
 

import com.pi4j.system.NetworkInfo; //导入依赖的package包/类
public String getIPAddress() throws IOException, InterruptedException {
   return NetworkInfo.getIPAddress();
}
 

import com.pi4j.system.NetworkInfo; //导入依赖的package包/类
public String getFQDN() throws IOException, InterruptedException {
   return NetworkInfo.getFQDN();
}
 

import com.pi4j.system.NetworkInfo; //导入依赖的package包/类
public String[] getNameservers() throws IOException, InterruptedException {
   return NetworkInfo.getNameservers();
}
 

import com.pi4j.system.NetworkInfo; //导入依赖的package包/类
public String[] getFQDNs() throws IOException, InterruptedException {
   return NetworkInfo.getFQDNs();
}