Com_sheet :: A command line spreadsheet application

Question

com_sheet is a basic, lightweight command line spreadsheet application.
Latest release: v0.4 beta
Features ::
> Add any number of columns, rows
> Search
> Sort
> Edit
> Delete
> Formulaes
> Save to file (in both tabular and parsable formats)
> Load saved spreadsheets
> Colors
GitHub repo
Clone with:
git clone git://github.com/0pointr/com_sheet.git
Please read the files README and FORMULAE for instructions on compilation, usage and the current limitations.
Suggestions, critics and feature requests are all welcome.
Screenshots:
Last edited by debdj (2013-01-26 16:27:59)

Answer 1

Obviously you can't read from the scanner. Instead you have to read from request parameters.
So you have to take a step back and define what values are being input into your application.
At its most basic you could do it as a jsp page with a textfield/textarea which the user could type into instead of typing on the console input.
For instance if your application asks the user to enter their name, and then reads the name from System.in, then you have on your jsp page a <input type="text"> and a submit button.
In the servlet which gets run when you submit the button you get the user's name via request.getParameter().
At that point you have your input String, and have removed System.in from the process.
But you are not just limited to text input with an html form. You can use any of the controls available. So asking a user "What is your favorite colour?" Instead of having them type in the answer, you could have them choose it from a radio group or dropdown select box.
Either way it still gets to the Servlet as a String via request.getParameter.
Steps you might follow
1 - identify the values being input into your program
2 - Write your jsp - start with just textfields
3 - Write your servlet handler to retrieve the values from the JSP.
4 - Determine the appropriate control on an html form to replace each input
5 - Modify the textfields to other controls (dropdown/radio button) as appropriate.
Theoretically the rest of your program doesn't need to change once you have the value in a String.
Your method of reading just changes from using Scanner and System.int to request.getParameter()
Similarly your method of writing would change from using System.out to a response JSP page.
hope this helps,
evnafets