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The Book
Chapter 3 Examples from Java Servlet Programming

  • 3-1: A simple counter
  • 3-2: A more holistic counter
  • 3-3: A counter that reads init parameters
  • 3-4: A fully persistent counter
  • 3-6: On the hunt for primes

Examples from other chapters:


Example 3.1: A simple counter
This servlet counts and displays the number of times it has been accessed since the last server reboot.

Example 3.2: A more holistic counter
This servlet counts the times it has been accessed, the number of instances created by the server, and the total times all of them have been accessed.

Example 3.3: A counter that reads init parameters
This servlet counts and displays the number of times it has been accessed, and reads an init parameter to know what at what number to begin counting.

Example 3.4: A fully persistent counter
This servlet counts and displays the number of times it has been accessed, and saves the count to a file in its destroy() method to make the count persistent.

Example 3.6: On the hunt for primes
This servlet searches for prime numbers above one quadrillion. The algorithm it uses couldn't be simpler: it selects odd-numbered candidates and attempts to divide them by every odd integer between 3 and their square root. If none of the integers evenly divides the candidate, it is declared prime. It's disabled to let the server's CPU handle important tasks.
    • Try it (disabled for efficiency)
    • Source

 


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