On 4/19/05, Joe Germuska <[EMAIL PROTECTED]> wrote:
> At 11:06 PM -0700 4/18/05, Michael J. wrote:
> >2) You can set the params too, it is not a big deal. Do not edit
> >existing ActionForward from findForward, instead create a new one and
> >append query parameters.
>
> Note that about two months ago, a class called "ActionRedirect" was
> added to clean up this particular use case (adding parameters to a
> redirecting ActionConfig.)
>
> http://cvs.apache.org/viewcvs.cgi/struts/core/trunk/src/share/org/apache/struts/action/ActionRedirect.java?root=Apache-SVN&rev=153901&view=markup
>
> No Struts release has been made since this was added, but you should
> know it's there and if you're using a nightly build, you should use
> it.
>
> Joe
Whoa, a whole class. I use just a simple method, which appends
parameters for redirected request. There is no point to do this for
forwarded parameters, they can be passed through server-side objects.
This utility method is quite simple, it does not do a lot of error
handling, nor does it check for character set or for maximum URL
length. I use the same mappings from struts-config.xml file, I just
append request query parameters.
This is my action class:
------------------------
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) {
...
return ActionTools.goForward(
mapping, // mapping of this action
"editItem", // edit action name: "editItem.do"
true, // redirect == true
new String[] {"id="+itemId} // ex: "id=1234"
);
}
This is my helper method:
-------------------------
/**
* Updates ActionForward object with URL parameters.
* @param actionMapping action mapping object
* @param forwardName mapping name
* @param redirect true if redirect, false if forward
* @param urlParams array of "key=value" strings which
* should be added to actionForward path
* as HTTP GET parameters
* @return modified ActionForward object with updated GET parameters
*/
public static ActionForward goForward(ActionMapping actionMapping,
String forwardName,
String[] urlParams)
{
// Find ActionForward object, defined in struts-config.xml
ActionForward actionForward = actionMapping.findForward(forwardName);
if (actionForward == null) return null;
// Append URL parameters. Important on redirect.
String actionPath = actionForward.getPath();
if (actionPath != null && urlParams != null) {
for (int i = 0; i < urlParams.length; i++) {
actionPath += i==0 ? "?" : "&";
actionPath += urlParams[i];
}
}
// Create new ActionForward object. Stuts does not
// allow to modify ActionForward objects, statically
// defined in struts-config.xml
ActionForward actionRedirect =
new ActionForward(actionForward.getName(),
actionPath,
redirect
);
return actionRedirect;
}
Michael.
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