At several projects I needed a struts based "browser back" mechanism or a "subcall" mechanism. In both cases you have to store the last request (with request parameter) an restores it.
Subcall means: From different contextes I navigate to the same site. To increse usability I will the user let go back to the context he comes from.
I have written a BaseBackAction which all actions must subclass. This base action saves the requestpath and pushed it on a stack. To go back you have to implement a back-path in the struts-config.xml like
<action path="/back" type="org.mwolff.struts.actions.BackAction"/>
The BackAction pops the path from the stack and forwards to it. The stack is limited to n entries, 10 default. If no back is possible, the BackAction forwards to the same
path, where it calls from.
Only actions that subclass from the BaseBackAction can use this automatic mechanism. So there is a second mechanism to register if you don't use this base action.
The whole documentation is on
http://www.manfred-wolff.de/struts/articles/HowTo-Back.html
There you can also download the two classes.
Improvments and suggestions are welcome.
Manfred
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