By Michael J. Donahoo, Kenneth L. Calvert

The networking services of the Java platform were prolonged significantly because the first version of the publication. This re-creation covers model 1.5-1.7, the most up-tp-date iterations, in addition to making the subsequent improvements:

The API (application programming interface) reference sections in each one bankruptcy, which describe the suitable components of every classification, were changed with (i) a precis part that lists the sessions and strategies utilized in the code, and (ii) a ?gotchas? part that mentions nonobvious or poorly-documented features of the items.

In addition, the publication covers numerous new periods and services brought within the previous few revisions of the Java platform. New abstractions to be coated contain NetworkInterface, InterfaceAddress, Inet4/6Address, SocketAddress/InetSocketAddress, Executor, and others; prolonged entry to low-level community details; help for IPv6; extra entire entry to socket strategies; and scalable I/O. the instance code can also be converted to use new language beneficial properties equivalent to annotations, enumerations, in addition to generics and implicit iterators the place appropriate.

Most web purposes use sockets to enforce community verbal exchange protocols. This book's centred, tutorial-based process is helping the reader grasp the initiatives and methods necessary to almost all client-server initiatives utilizing sockets in Java. bankruptcy 1 offers a genral review of networking innovations to permit readers to synchronize the strategies with terminology. bankruptcy 2 introduces the mechanics of easy consumers and servers. bankruptcy three covers uncomplicated message development and parsing. bankruptcy four then bargains with suggestions used to construct extra strong consumers and servers. bankruptcy five (NEW) introduces the scalable interface amenities which have been brought in Java 1.5, together with the buffer and channel abstractions. bankruptcy 6 discusses the connection among the programming constructs and the underlying protocol implementations in additional aspect. Programming strategies are brought via uncomplicated application examples followed via line-by-line code statement that describes the aim of each a part of this system. The book's website comprises many examples of command-based sockets-related code mentioned during the booklet. No different source provides so concisely or so successfully the fabric essential to wake up and working with Java sockets programming.

KEY FEATURES

* targeted, tutorial-based guideline in key sockets programming innovations permits reader to speedy arise to hurry on Java purposes.
* Concise and up to date insurance of the latest platform (1.7) for Java
applications in networking technology
* presents code for all instance courses through a significant other site to enable the reader see the $64000 items and strategies in context and to appreciate the aim of every line of code.

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Extra info for TCP/IP Sockets in Java: Practical Guide for Programmers (2nd Edition) (The Practical Guides)

Example text

In either case, the basic principles of encoding and decoding different types of information as bytes “on the wire” are the same. By the way, everything in this chapter also applies if the “wire” is a file that is written by one program and then read by another. 1 Encoding Information Let’s first consider the question of how simple values such as ints, longs, chars, and Strings can be sent and received via sockets. We have seen that bytes of information can be transmitted through a socket by writing them to an OutputStream (associated with a Socket) or encapsulating them in a DatagramPacket (which is then sent via a DatagramSocket).

Upon establishment of a new client connection, an instance of Socket for the new connection is created and returned by accept(). b. Communicate with the client using the returned Socket’s InputStream and OutputStream. c. When finished, close the new client socket connection using the close() method of Socket. java, implements the echo service used by our client program. The server is very simple. It runs forever, repeatedly accepting a connection, receiving and echoing bytes until the connection is closed by the client, and then closing the client socket.

Our echo client performs the following steps: 1. Send the echo string to the server. 2. Block on receive() for up to three seconds, starting over (up to five times) if the reply is not received before the timeout. 3. Terminate the client. length == 3) ? java 1. Application setup and parameter processing: lines 0–20 2. UDP socket creation: line 22 This instance of DatagramSocket can send datagrams to any UDP socket. We do not specify a local address or port so some local address and available port will be selected.

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