How to create Java socket that is localhost only?

I have a Java server that opens up a socket using ServerSocket (using Thrift with it). This server has a client on the local machine in Obj-c that communicates with the Java server. Everything happens on localhost. Right now the java server is visible on the network as well, I would like the java server to only be accessible on localhost. Otherwise it is a potential security vulnerability and it freaks u开发者_如何转开发sers out when their firewall warns them.

I tried creating the server socket using an InetSocketAddress('localhost', 9090) but that seems to have no effect. How can I limit this thing to localhost?

Taken from another question:

new ServerSocket(9090, 0, InetAddress.getByName(null));

InetAddress.getByName(null) points to the loopback address (127.0.0.1)

And here's the Javadoc where it says that

Let me chime in with an alternative solution which only accepts on loopback device. All the other "localhost" solutions will make Java pick an interface.

new ServerSocket(9090, 0, InetAddress.getLoopbackAddress());

This is available since Java 7, and does not even throw UnknownHostException

Try

new ServerSocket(9090, 0, InetAddress.getByName("localhost"))

The last parameter to the constructor specifies which address to bind the listening socket to.

new ServerSocket(9090, 0, InetAddress.getByName(null));