LookupDispatchAction

LookupDispatchAction extends the functionality of DispatchAction class that support internationalization. LookupDispatchAction uses the value of the request parameter to reverse-map to a property in the Struts resource bundle file. ApplicationResources.properties. That is, the value of the request parameter is compared against the values of properties in the resource bundle until a match is found. The key for the matching property is then used as a key to another map that maps to a method in 

your LookupDispatchAction subclass that will be executed.

To use LookupDispatchAction, you must create a subclass from it and provide a set of methods that will be called to process requests. The subclass must also include a getKeyMethodMap( ) method that maps methods in the class to keys in the Struts resource bundle file.


 Following is an example UserAction class that extends DispatchAction:

package pack.nk;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;

public class UserAction extends LookupDispatchAction
{
  protected Map getKeyMethodMap()
  {
    HashMap map = new HashMap();
    map.put("button.add", "add");
    map.put("button.update", "update");
    map.put("button.remove", "remove");

    return map;
  }

  public ActionForward add(ActionMapping mapping,
    ActionForm form,
    HttpServletRequest request,
    HttpServletResponse response)
    throws Exception
  {
    // Add user.
    …

    return new ActionForward("success");
  }

  public ActionForward update(ActionMapping mapping,
    ActionForm form,
    HttpServletRequest request,
    HttpServletResponse response)
    throws Exception
  {
    // Update user.
    …

    return new ActionForward("success");
  }

  public ActionForward remove(ActionMapping mapping,
    ActionForm form,
    HttpServletRequest request,
    HttpServletResponse response)
    throws Exception
  {
    // Remove user.
    …

    return new ActionForward("success");
  }
}

<action-mappings>
  <action path="/User"
          type="pack.nk.UserAction"
     parameter="function"/>
</action-mappings>

The value specified with the parameter attribute of the action tag will be used as the name of a request parameter that will contain the value of a key in the Struts resource bundle shown here:

button.add=Add User
button.update=Update User
button.remove=Remove User