Some Program #1 Notes
Hey guys, here are some Program #1 notes that
I though you may find helpful:
- It ended up that BILLTP gui client is
just a general sort of telnet gui that sends commands to a
server at a (IP, port) and echos the response of that server.
- Speaking of my gui... here's the current
state of the art (ha!). The tiny window below consists of a
variety of the following gui objects:
JFrame, JPanel, JLabel, JTextField,
JTextArea, JScrollPane:
- I turned my user's typed request into an
array of tokens using the
split() method in the
String class.
It's something like this:
| String[] requestTokens; |
| // read command and
parameters into request String |
| requestTokens =
request.split("\\s") |
- You can turn a
String into
an int
using Integer.parseInt()
- I used
PrintWriter objects to make the output
stream easier to use (methods like
print and
println
are available). The only trick is that you have to
flush() the
PrintWriter
to get the characters to actually be sent. You can do this each
time you print, or tell the
PrintWriter to auto-flush when you
create it.
Finally... remember:
- The Java API has all the details for you
online at
java.sun.com/j2se/1.5.0/docs/api/
- The Java tutorials have really great
examples
- Email and/or see me if you need help.
Also, I hope to have some lab time Tuesday night to take your
questions as well
- Priorities: get your client/server
protocol working, high quality code, documented code using
Javadoc, and lastly a pretty gui
thanks... yow, bill
PS - Below is my BILLTP protocol definition
for your enjoyment.
BILLTP Protocol Definition
The Better Internet Lists of Lists Trasnfer
Protocol (BILLTP) provides an Internet interface to my favorite
lists... things like movies and quotes and students, you know.
BILLTP was created for CSC 469 Program #1.
BILLTP is simple. Here a table of the client
requests (commands) and their respective server replies:
| Client
Request |
Server Action/Reply |
|
LISTS |
Server lists all the
lists that it currently knows about
Reply is a comma-separated string
list names. If no lists are available, then an empty
string ""
is returned. An example reply:
"movies,quotes,1969
Chicago Cubs baseball players" |
|
LIST <num> |
Server sets the
"current list" to the number specified. If
<num>
is not specified or out of range, then a list is chosen
randomly. Reply is the
number of objects in the current list. If no lists are
available to the server, then 0 is returned. |
|
ITEM <num> |
Retrieve the
<num>
element in the list. If
<num> is not specified or out
of bounds, then an item is chosen randomly and returned.
Reply is the item specified in the
list. |
|
EXIT |
Closes the server's
socket connection to the client.
Reply is
"OK". |
BILLTP uses port number 7870.
that's it... yow, bill
wtkrieger@noctrl.edu |