Download An Introduction to Network Programming with Java: Java 7 by Jan Graba PDF

By Jan Graba

ISBN-10: 1447152549

ISBN-13: 9781447152545

Because the moment version of this article, using the net and networks commonly has endured to extend at a beautiful fee. This has resulted in either a rise widespread for community software program and to advancements within the know-how used to run such networks, with the latter obviously resulting in adjustments within the former. in this time, the Java libraries were up-to-date to maintain with the hot advancements in community expertise, in order that the Java programming language is still one of many mainstays of community software program development.

In delivering a truly readable textual content that avoids getting immersed in low-level technical information, whereas nonetheless offering an invaluable, functional consultant to community programming for either undergraduates and busy IT execs, this 3rd variation maintains the craze of its predecessors. To maintain its foreign money, the textual content has been up to date to mirror alterations that experience taken position in Java's community expertise over the last seven years (including the discharge of Java 7), while keeping its impressive positive factors of diverse code examples, screenshots and end-of-chapter workouts.

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Extra info for An Introduction to Network Programming with Java: Java 7 Compatible (3rd Edition)

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Create the response datagram. Create a DatagramPacket object, using an overloaded form of the constructor that takes four arguments: • • • • the byte array containing the response message; the size of the response; the client’s address; the client’s port number. The first of these arguments is returned by the getBytes method of the String class (acting on the desired String response). ) 8. Send the response datagram. This is achieved by calling method send of our DatagramSocket object, supplying our outgoing DatagramPacket object as an argument.

There are also two buttons, one that the user presses after entry of the host name and the other that closes down the program. The text area is ‘wrapped’ in a JScrollPane, to cater for long lines of output, while the buttons are laid out on a separate panel. The application frame itself will handle the processing of button presses, and so implements the ActionListener interface. The window-closing code (encapsulated in an anonymous WindowAdapter object) ensures that any socket that has been opened is closed before exit from the program.

Else mailbox[messagesInBox] = message; } private static void doRead(String[] mailbox, int messagesInBox, PrintWriter output) { /* Client has requested 'reading', so server must read messages from other client's message box and then send those messages to the first client. 2. 3 Network Programming with GUIs 43 ASK IF USER WANTS TO DO ANOTHER READ/SEND. 4. println( "\n* Unable to close link! append("\n*** No such host! toString() + " ***\n"); } } } Chapter 3 Multithreading and Multiplexing Learning Objectives After reading this chapter, you should: • understand what is meant by a thread (in a programming context); • appreciate the need for multithreaded programming; • be aware of typical circumstances under which multithreading might be appropriate; • know how to implement threads in Java; • know how to implement locking of variables in Java; • be aware of the danger posed by deadlock; • know what Java methods to use in order to improve thread efficiency and reduce the likelihood of deadlock; • know how to implement a multithreaded server; • know how to implement a non-blocking server via multiplexing.

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