Download e-book for iPad: An Introduction to Network Programming with Java: Java 7 by Jan Graba

By Jan Graba

ISBN-10: 1447152549

ISBN-13: 9781447152545

Because the moment variation of this article, using the net and networks mostly has persisted to extend at a good looking fee. This has resulted in either a rise renowned for community software program and to advancements within the know-how used to run such networks, with the latter evidently resulting in adjustments within the former. in this time, the Java libraries were up-to-date to take care of with the hot advancements in community know-how, in order that the Java programming language remains to be one of many mainstays of community software program development.

In supplying a truly readable textual content that avoids getting immersed in low-level technical info, whereas nonetheless offering an invaluable, useful consultant to community programming for either undergraduates and busy IT execs, this 3rd version maintains the fad 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 during the last seven years (including the discharge of Java 7), when preserving its impressive beneficial properties of diverse code examples, screenshots and end-of-chapter workouts.

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

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3 Example output from the TCPEchoServer program Fig. 2 Datagram (UDP) Sockets Unlike TCP/IP sockets, datagram sockets are connectionless. That is to say, the connection between client and server is not maintained throughout the duration of the dialogue. Instead, each datagram packet is sent as an isolated transmission whenever necessary. As noted in Chap. 1, datagram (UDP) sockets provide a (usually) faster means of transmitting data than TCP/IP sockets, but they are unreliable. Since the connection is not maintained between transmissions, the server does not create an individual Socket object for each client, as it did in our TCP/ IP example.

Examine this code and make the necessary additions in the places indicated by the commented lines. When you have completed the program, run it and supply the name of any convenient server when prompted for a server name. If you don’t have access to a convenient server use localhost, having changed the port number of TCPEchoServer (Sect. 1) to 7 and then started that program running. 2. equals("send")) { doSend(mailbox2,messagesInBox2,input); if (messagesInBox2

Accept the sender’s address and port from the packet. Methods getAddress and getPort of our DatagramPacket object are used for this. getPort(); 6. Retrieve the data from the buffer. For convenience of handling, the data will be retrieved as a string, using an overloaded form of the String constructor that takes three arguments: • a byte array; • the start position within the array (= 0 here); • the number of bytes (= full size of buffer here). getLength()); 7. 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.

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An Introduction to Network Programming with Java: Java 7 Compatible (3rd Edition) by Jan Graba


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