SV: What is the best way to pass a parameter to a forward? Create a utility class
Some time ago this question has been asked before and someone showed
some utility class code. I used the code and created a class like this:
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import org.apache.struts.action.ActionForward;
/**
* Simple utility class to add parameters to an ActionForward
* from within an action. This action is useful when you from
* within an action need to pass parameters to the jsp page or another
action
* you are forwarding to.
*/
public class ActionForwardParameters {
/**
* Encupsulates parameters for ActionForward.
*/
private Map params = new HashMap();
/**
* add all the parameters and values from the hashtable to the
actionforward
* @param parametersValues a hastable with key value pairs
* @return ActionForwardParameters object
*/
public ActionForwardParameters add(Hashtable parametersValues) {
for(Iterator i =
parametersValues.keySet().iterator();i.hasNext();){
String key = (String) i.next();
params.put(key,(String) parametersValues.get(key));
}
return this;
}
/**
* Add parameters to provided ActionForward
* @param forward ActionForward to add parameters to
* @return ActionForward with added parameters to URL
*/
public ActionForward forward(ActionForward forward) {
StringBuffer path = new StringBuffer(forward.getPath());
Iterator iter = params.entrySet().iterator();
if (iter.hasNext()) {
//add first parameter, if avaliable
Map.Entry entry = (Map.Entry) iter.next();
path.append(? + entry.getKey() + = + entry.getValue());
//add other parameters
while (iter.hasNext()) {
entry = (Map.Entry) iter.next();
path.append( + entry.getKey() + = +
entry.getValue());
}
}
return new ActionForward(path.toString());
}
}
Please note that I didn't come up with the idea of this class, I simply
created the class after reading the information that a fellow programmer
Provided.!
-Oprindelig meddelelse-
Fra: Jay Glanville [mailto:[EMAIL PROTECTED]
Sendt: 16. marts 2004 13:13
Til: 'Struts Users Mailing List'
Emne: RE: What is the best way to pass a parameter to a forward?
It's funny that you say that it will not work, because it does for me,
and without throwing any exceptions.
That being said, your point about modifying an action mappings forwards
is a good one. It is unfortunate that the ActionForward class doesn't
have a copy constructor
--
Jay Glanville
-Original Message-
From: news [mailto:[EMAIL PROTECTED] On Behalf Of Martin Cooper
Sent: Monday, March 15, 2004 8:30 PM
To: [EMAIL PROTECTED]
Subject: Re: What is the best way to pass a parameter to a forward?
What you are doing will not work - at least, not the way you
are doing it.
You are trying to modify the ActionForward instance that is
owned by Struts,
and calling setPath() on that instance will result in an
IllegalStateException.
You need to create your own ActionForward instance, instead
of trying to
modify Struts' one. You can do that with something like this:
ActionForward goto = mapping.findForward( success );
String path = ...; // Put together your new path
ActionForward myGoto = new ActionForward(path,
goto.getRedirect());
return myGoto;
--
Martin Cooper
Glanville, Jay [EMAIL PROTECTED] wrote
in message
news:[EMAIL PROTECTED]
I'm trying to solve a problem, but I'm not sure my solution
is the best
way. Basically, I want to set a parameter on a forward within the
action's execute.
I'm in my action's execute method. I've just successfully performed
some work, and I now want to forward/redirect to the next page. So,
I've got some code that looks like this:
public ActionForward execute(ActionMapping.) {
// do some work
ActionForward goto = mapping.findForward( success );
return goto;
}
With an action mapping that looks like this:
action
path=/EntrySave
type=com.package.EntrySaveAction
name=EntryForm
validate=true
input=/Entry.do
forward name=success redirect=true path=/Container.do/
forward name=failure redirect=false path=/Entry.do /
/action
Basically, if I left the EntrySaveAction.execute do what's doing right
now, then upon successful completion, it would redirect to
/Container.do. However, what I want it to do is redirect to
/Container.do?id=45, where 45 is the id of the container that I want
to go to. The value of 45 is dynamic, and is know at the time of
the EntrySaveAction.execute command.
The way I'm currently doing it is something like this:
public ActionForward execute(ActionMapping.) {
// do some work
ActionForward goto =
SV: What is the best way to pass a parameter to a forward? Create a utility class .Client code
Forgot to show the code how to use it!
In your action you should not return
return mapping.findForward(bla)
but
Hashtable a = new Hashtable();//add what ever key/value pairs you need
return new
ActionForwardParameters().add(a).forward(mapping.findForward(success))
;
-Oprindelig meddelelse-
Fra: Tommy Holm - TELMORE
Sendt: 16. marts 2004 13:48
Til: Struts Users Mailing List
Emne: SV: What is the best way to pass a parameter to a forward? Create
a utility class
Some time ago this question has been asked before and someone showed
some utility class code. I used the code and created a class like this:
import java.util.HashMap; import java.util.Hashtable; import
java.util.Iterator; import java.util.Map;
import org.apache.struts.action.ActionForward;
/**
* Simple utility class to add parameters to an ActionForward
* from within an action. This action is useful when you from
* within an action need to pass parameters to the jsp page or another
action
* you are forwarding to.
*/
public class ActionForwardParameters {
/**
* Encupsulates parameters for ActionForward.
*/
private Map params = new HashMap();
/**
* add all the parameters and values from the hashtable to the
actionforward
* @param parametersValues a hastable with key value pairs
* @return ActionForwardParameters object
*/
public ActionForwardParameters add(Hashtable parametersValues) {
for(Iterator i =
parametersValues.keySet().iterator();i.hasNext();){
String key = (String) i.next();
params.put(key,(String) parametersValues.get(key));
}
return this;
}
/**
* Add parameters to provided ActionForward
* @param forward ActionForward to add parameters to
* @return ActionForward with added parameters to URL
*/
public ActionForward forward(ActionForward forward) {
StringBuffer path = new StringBuffer(forward.getPath());
Iterator iter = params.entrySet().iterator();
if (iter.hasNext()) {
//add first parameter, if avaliable
Map.Entry entry = (Map.Entry) iter.next();
path.append(? + entry.getKey() + = + entry.getValue());
//add other parameters
while (iter.hasNext()) {
entry = (Map.Entry) iter.next();
path.append( + entry.getKey() + = +
entry.getValue());
}
}
return new ActionForward(path.toString());
}
}
Please note that I didn't come up with the idea of this class, I simply
created the class after reading the information that a fellow programmer
Provided.!
-Oprindelig meddelelse-
Fra: Jay Glanville [mailto:[EMAIL PROTECTED]
Sendt: 16. marts 2004 13:13
Til: 'Struts Users Mailing List'
Emne: RE: What is the best way to pass a parameter to a forward?
It's funny that you say that it will not work, because it does for me,
and without throwing any exceptions.
That being said, your point about modifying an action mappings forwards
is a good one. It is unfortunate that the ActionForward class doesn't
have a copy constructor
--
Jay Glanville
-Original Message-
From: news [mailto:[EMAIL PROTECTED] On Behalf Of Martin Cooper
Sent: Monday, March 15, 2004 8:30 PM
To: [EMAIL PROTECTED]
Subject: Re: What is the best way to pass a parameter to a forward?
What you are doing will not work - at least, not the way you are doing
it. You are trying to modify the ActionForward instance that is
owned by Struts,
and calling setPath() on that instance will result in an
IllegalStateException.
You need to create your own ActionForward instance, instead of trying
to modify Struts' one. You can do that with something like this:
ActionForward goto = mapping.findForward( success );
String path = ...; // Put together your new path
ActionForward myGoto = new ActionForward(path,
goto.getRedirect());
return myGoto;
--
Martin Cooper
Glanville, Jay [EMAIL PROTECTED] wrote in
message
news:[EMAIL PROTECTED]
I'm trying to solve a problem, but I'm not sure my solution
is the best
way. Basically, I want to set a parameter on a forward within the
action's execute.
I'm in my action's execute method. I've just successfully performed
some work, and I now want to forward/redirect to the next page. So,
I've got some code that looks like this:
public ActionForward execute(ActionMapping.) {
// do some work
ActionForward goto = mapping.findForward( success );
return goto;
}
With an action mapping that looks like this:
action
path=/EntrySave
type=com.package.EntrySaveAction
name=EntryForm
validate=true
input=/Entry.do
forward name=success redirect=true path=/Container.do/
forward name=failure redirect=false path=/Entry.do /
/action
Basically, if I left the EntrySaveAction.execute do what's doing right
