Recommended Books

Java I/O ,
by Elliotte Rusty Harold , O'Reilly.

Java Network Programming
by Merlin and Conrad Hughes, Michael Shoffner, and Maria Winslow, Prentice-Hall.

Java Network Programming,
by Elliotte Rusty Harold , O'Reilly.

Java Security ,
by Scott Oaks, O'Reilly.

Java Cryptography ,
by Jonathan Knudsen, O'Reilly.

Core Servlets and JavaServer Pages: Volume 1 ,
by Marty Hall and Larry Brown, Prentice-Hall

Inside Servlets: Second Edition ,
by Dustin Callaway, Addison-Wesley

Java Servlet Programming ,
by Jason Hunter with Willian Crawford, O'Reilly.

Core Java 2, Volume I , Fundamentals (Fourth Edition),
by Gary Cornell and Cay Horstmann, Prentice-Hall.

Core Java 2, Volume II , Advanced Features (Fourth Edition),
by Gary Cornell and Cay Horstmann, Prentice-Hall.