January 1998
Intermediate to advanced
384 pages
10h 45m
English
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Sockets and Streams
The
java.net
package provides an object-oriented
framework for the creation and use of
Internet Protocol (IP)[5] sockets. In this section,
we’ll take a look at these classes and what they offer.
IP Addressing
Before communicating with another party, you must first know how to address your messages so they can be delivered correctly. Notice that I didn’t say that you need to know where the other party is located—once a scheme for encoding a location is established, I simply need to know my party’s encoded address to communicate. On IP networks, the addressing scheme in use is based on hosts and port numbers.
A given host computer on an IP network has a hostname and a numeric address. Either of these, in their fully qualified forms, is a unique identifier for a host on the network. The JavaSoft home page, for example, resides on a host named www.javasoft.com, which currently has the IP address 204.160.241.98. Either of these addresses can be used to locate the machine on an IP network. The textual name for the machine is called its Domain Name Services (DNS) name, which can be thought of as a kind of alias for the numeric IP address.
In the Java API, the
InetAddress
class represents an IP address. You can
query an InetAddress for the name of the host
using its
getHostName()
method, and for its numeric address using
getAddress()
. Notice that, even though we can uniquely specify a host with its IP address, we do not necessarily know its physical location. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.