Struts 2 dispatcher
i wou开发者_开发百科ld like to initialize (in Struts2) a property(data loading from a file) only once and make available that property for entire struts 2 application. how can i achieve that? do i need override struts 2 dispatcher?
Regards Raju
You could create a ServletContextListener
defined in web.xml
that opens your property file and sets the desired value to the ServletContext
via:
getServletContext().setAttribute("dataKey", dataValue);
The ServletContext
has application-wide scope.
Update:
You can create a new class that implements ServletContextListener
(here is its JavaDoc: ServletContextListener), which requires that you define contextInitialized()
and contextDestroyed()
methods.
The method contextInitialized()
is called right before your servlet begins accepting requests. In your contextInitialized()
method, you would include the getServletContext().setAttribute("dataKey", dataValue)
call.
In order to register your listener, you will need to add a listener definition in your web.xml
file:
<listener>
<listener-class>CLASS_PATH.CLASS_NAME</listener-class>
</listener>
You'll need to replace CLASS_PATH.CLASS_NAME in the above XML with the class path and name of the context listener class you just created.
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