How to retrieve checkbox values in Struts 2 action class ?

Question

I have dynamic number of checkboxes in jsp page as given below.

Answer 1

Because your checkboxes are all named the same (checkbox), Struts2 is just passing the following:

checkbox=true&checkbox=true&checkbox=true

Does that mean that you omitted the second, third, or fourth checkbox?

What you actually want is not an array of booleans, but a map of Integer to Boolean. Here's an example:

Example Action

public class MyAction extends ActionSupport {
  private Map checkboxes;

  ...

  public Map getCheckboxes() {
    return checkboxes;
  }

  public void setCheckboxes(Map checkboxes) {
    this.checkboxes = checkboxes;
  }
}

Example JSP

  <%-- this outputs checkboxes[0], checkboxes[1], etc. --%>
  

Example Result

• 0 -> true
• 1 -> false
• 2 -> true
• 3 -> true