15. Advanced topics

Question 1

How would you configure an action to invoke a different method than execute()?

Answer 1

When defining your action, add the method=”test” attribute.

Question 2

How would you configure dynamic mapping to your Actions?

Answer 2

Your action name contains some wildcard, then use that in your method with {1}

Question 3

How you you dynamically substritue results using the Valuestack?

Answer 3

Notice our action stores ‘nextPage’ so it’s on the Valuestack. We then fetch whatever is in nextPage for our result (notice the ${expression} syntax because it’s in XML)

Question 4

How can we preventr duplicate forms from being submitted?

Answer 4

Useing the token tag. Put it your form, Struts handles the rest.

Question 5

Say you have a long running action, you want the user to know that it’s working and to be patient. What’s an easy built in way of doing this?

Answer 5

execAndWait, put this as the LAST filter on your stack (it stops running filters and calls the action directly)

Then it redirects user to a please wait page, and refreshes every 2 seconds. When process is complete then page will automatically return to normal!