子网掩码及IP获取

使用java获取子网掩码，用于判断是否为内网IP，代码如下：

NetworkInterface networkInterface = NetworkInterface.getByInetAddress(InetAddress.getLocalHost()) ;
	List<InterfaceAddress> list = networkInterface.getInterfaceAddresses() ;
	for (InterfaceAddress interfaceAddress : list) {
		InetAddress inetAddress = interfaceAddress.getAddress() ;
		System.out.println("子网掩码位数："+interfaceAddress.getNetworkPrefixLength()+"；本机IP："+inetAddress.getHostAddress());
	}

获取本机mac地址，参考页面：http://lpyyn.iteye.com/admin/blogs/2108263