How to get value from a checkbox in a jsp page?

hi there
i have a form in a jsp which contains a <input type='checkbox' name='xx'>
when i submit the form, how can i get the value for this checkbox? i could use request object to get parameter. i tried the following and could not get any value:
request.getParameter("xx");
is there any to get it? thanks.

"checkbox" can have multiple values b/c you can check more than 1 checkbox and they can have same name.
Example
<input type="checkbox" name="number" value="1">one
<input type="checkbox" name="number" value="2">two
<input type="checkbox" name="number" value="3">three
To get values of "number" field:
String [] numberValues = request.getParameterValues("number");
where numberValues[0] is the 1st value checked, numberValues[1] is 2nd value checkted and so on.....
If you have no checkbox checked then you might get a "null pointer exception", so make sure you check to see if it's null first before accessing your numberValues array.
If you just have 1 checkbox; then you can just call request.getParameterValue("number") and that will return your value.

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