Hi,
I have been using struts 2 since a while and there is some things about
the <s:url> tag i don't understant.
Let's say we have an array in our action (with the getters and setters):
private String[] myArray;
public String[] getMyArray() {
return myArray;
}
public void setMyArray(String[] myArray) {
this.myArray = myArray;
}
and that in our action, we do something to initializate the array:
String[] arr = new String[3];
arr[0] = "Aa";
arr[1] = "Bb";
arr[2] = "Cc";
Now, if in our JSP we use the <s:url> tag:
<a href="<s:url includeParams="none" action="TestUrlArray.action ">
<s:param name="myArray" value="myArray" />
</s:url>" >Use Link
</a>
we can see that the created url is:
TestUrlArray.action?myArray=Aa&myArray=Bb&myArray=Cc
Also, in the destination action, we are able to recover the information
from the variable "myArray" if we have defined something like "private
String[] myArray".
So for, so good.
Now, let's see the Collections:
In the action we will have:
private Collection<String> myCollection = new ArrayList<String>();
public Collection <String> getMyCollection () {
return myCollection;
}
public void setMyList(Collection <String> myCollection) {
this.myCollection = myCollection;
}
we initialize the collection:
Collection<String> col = new ArrayList<String>();
col.add("Aa");
col.add("Bb");
col.add("Cc");
setMyCollection(col);
Finally, we use the <s:url> tag:
<a href="<s:url includeParams="none" action="TestUrlArray.action ">
<s:param name="myCollection" value="myCollection" />
</s:url>" >Use Link
</a>
Here, the created link looks like:
TestUrlArray.action?myCollection=[Aa,+Bb,+Cc]
But, if we try to recover the collection in the destination action
(where offcourse we have defined "Collection<String> col = new
ArrayList<String>();" ), we will see that we recover a collection of
only one element, and that this element is our old collection (the one
with 3 elements).
Now, it's time for questions:
1) Is it possible to manipulate arrays with the s2 tags ? (by
manipulate, i mean create a new array, add an element to an existing
array, remove an element, etc.)
2) Is it possible to manipulate collections with the s2 tags ?
(same meaning to manipulate)
3) Is there a work-arround to recover a Collection not as a new
collection of one element that contains a collection but as a new
collection that is like the collection we passed ?
Well, any ideas will be reallly wellcome :-)
