Download TCP..IP Sockets in Java : Practical Guide for Programmers by Calvert K.L., Donahoo M.J. PDF

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By Calvert K.L., Donahoo M.J.

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Read or Download TCP..IP Sockets in Java : Practical Guide for Programmers Morgan Kaufmann Practical Guides Series PDF

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Extra info for TCP..IP Sockets in Java : Practical Guide for Programmers Morgan Kaufmann Practical Guides Series

Sample text

We can explicitly set t h e m with the setLocalAddress() and setLocalPort() m e t h o d s or in the constructor. 3. Set the socket timeout: line 21 The timeout for a datagram socket controls the m a x i m u m a m o u n t of time (milliseconds) a call to r e c e i v e ( ) will block. Here we set the timeout to three seconds. Note that timeouts are not precise: the call may block for more than the specified time (but not less). 4. Create d a t a g r a m to send: lines 23-24 To create a datagram for sending, we need to specify three things: data, destination address, and destination port.

6. Send the datagram: lines 29-44 Since datagrams may be lost, we m u s t be prepared to retransmit the datagram. We loop sending and attempting a receive of the echo reply up to five times. 9 Send the datagram: line 32 send() transmits the datagram to the address and port specified in the datagram. 3 UDP Sockets 29 9 Handle d a t a g r a m reception: lines 33-43 r e c e i v e ( ) blocks until it either receives a d a t a g r a m or the timer expires. Timer expiration is indicated by an InterruptedlOException.

NextToken() reads bytes from the given InputStream until it encounters the given sequence of bytes or the stream ends. All bytes read up to that point are then returned in a new byte array. If the end of the stream is encountered before any data is read, null is returned. The delimiter can be different for each call to nextToken(), and the method is completely independent of any encoding. A couple of words of caution are in order here. First, nextToken() is terribly inefficient; for real applications, a more efficient pattern-matching algorithm should be used.

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