By Jan Graba
Since the second one variation of this article, using the net and networks regularly has endured to extend at a wonderful expense. This has resulted in either a rise well-known for community software program and to advancements within the know-how used to run such networks, with the latter clearly resulting in alterations within the former. in this time, the Java libraries were up-to-date to maintain with the recent 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 info, whereas nonetheless supplying an invaluable, useful consultant to community programming for either undergraduates and busy IT execs, this 3rd variation maintains the fashion of its predecessors. To continue its foreign money, the textual content has been up to date to mirror adjustments that experience taken position in Java's community expertise during the last seven years (including the discharge of Java 7), when holding its remarkable beneficial properties of various code examples, screenshots and end-of-chapter exercises.
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Extra info for An Introduction to Network Programming with Java: Java 7 Compatible
The full details of this simplified client–server application are given below. • The server recognises only two users, called ‘Dave’ and ‘Karen’. • Each of the above users has a message box on the server that can accept a maximum of 10 messages. • Each user may either send a one-line message to the other or read his/her own messages. • A count is kept of the number of messages in each mailbox. As another message is received, the appropriate count is incremented (if the maximum has not been reached).
1. Create a DatagramSocket object. This is similar to the creation of a DatagramSocket object in the server program, but with the important difference that the constructor here requires no argument, since a default port (at the client end) will be used. For example: DatagramSocket datagramSocket = new DatagramSocket(); 2. Create the outgoing datagram. This step is exactly as for step 7 of the server program. length(), host, PORT); 3. Send the datagram message. Just as for the server, this is achieved by calling method send of the DatagramSocket object, supplying our outgoing DatagramPacket object as an argument.
The final and most significant difference is that DatagramPacket objects are created and sent at both ends, rather than simple strings. Following the style of coverage for TCP client/server applications, the detailed steps required for client and server will be described separately, with the server process being covered first. This process involves the following nine steps, though only the first eight steps will be executed under normal circumstances… 1. Create a DatagramSocket object. Just as for the creation of a ServerSocket object, this means supplying the object’s constructor with the port number.
An Introduction to Network Programming with Java: Java 7 Compatible by Jan Graba