Redirecting to another action with unknown amount of parameters in Struts 2

Question

I have a login action which after successful execution redirects to the previous page (I store the previous page in my session so I can fetch it later). In Struts2, I can find two ways to do this redirection:

    <action name="login" class="com.myapp.login.Login">
        <result name="redirect" type="redirect">${previousAction.requestURL}</result>   
    </action>

In this example, the getPreviousAction().getRequestURL() method (this is a selfmade method, its not native to Struts2) will be invoked and this will return the URL of the previous page as intended, for example:

somenamespace/index.action

There is also another type of redirection:

<action name="login" class="com.myapp.login.Login">
     <result type="redirectAction">
        <param name="actionName">${previousAction.name}</param>
        <param name="namespace">/${previousAction.namespace}</param>
    </result>   
</action>

I want to use this `redirectAction result type because it is much cleaner. But, I have a problem when query parameters are part of the URL. For example:

somenamespace/index.action?name=john&age=50

I know I can add these params hardcoded in my struts.xml, but the problem is my login action should redirect to any previously invoked action, and I do not know beforehand which query parameters the previous actions had. This is different from the typical usecase where you know exactly to which action you're redirecting to

A very bad solution I found was adding every param possible (the collection of all params of all my actions in struts.xml) and then use the option:

<param name="suppressEmptyParameters">true</param>

better way to set your parameter in request scope and fetch them all in your next action — Nirav Prajapati, Jun 16 '14 at 10:16
http://struts.apache.org/development/2.x/docs/parameters-in-configuration-results.html. — Aleksandr M, Jun 16 '14 at 17:41

score 3 · Accepted Answer · answered Jun 16 '14 at 18:51

You can save action name, namespace, and parameters from the ActionMapping.

ActionMapping mapping = ServletActionContext.getActionMapping();

You can also save query string instead of parameter map.

String params = request.getQueryString();

To add parameters dynamically to redirectAction result you should use OGNL in a dynamic parameter.

<param name="actionName">${previousAction.name +'?'+ parameters}</param>

Supposed you have a getter for parameters and initialized it from session where you saved previous query string, action name, and namespace.

Great, in the documentation it looked like you could not provide additional parameters, only the name. — user1884155, Jun 18 '14 at 12:16

Redirecting to another action with unknown amount of parameters in Struts 2

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