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Chapter 3 Examples from Java Servlet
Programming, 2nd Ed
- 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
- 3-7: On the hunt for primes
- 3-10: A Guestbook using CacheHttpServlet
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 3.7: 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
- Example 3.10: A Guestbook using CacheHttpServlet
- This servlet shows how to take advantage of com.oreilly.servlet.CacheHttpServlet
. It’s a guestbook servlet that displays user-submitted comments.
The servlet stores the user comments in memory as a Vector of
GuestbookEntry objects. There's another version of this servlet
running off a database in Chapter 9, Database Connectivity. For
now, to simulate reading from a slow database, the display loop
has a half-second delay per entry. As the entry list gets longer,
the rendering of the page gets slower. However, because the servlet
extends CacheHttpServlet , the rendering only has to occur during
the first GET request after a new comment is added. All later
GET requests send the cached response.
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