How to get value from a HashMap in JSP while using Struts 2 framework

@melchkishore

Thanks for answer but what u said  wont be struts 2, if i am not wrong.
Anyways can you be a bit more clear with some snippets if possible.

You can try like this below

In my Action class :

HashMap hmap = new HashMap()
map.put(q1,object1);
map.put(q2,object2);
map.put(q3,object3);
request.setAttribute("forumList",map);

in jsp

<logic:iterate>

<jsp:useBean id="forumList" scope="request" class="java.util.HashMap"/>

<logic:iterate id="forums" name="forumList">

<tr><td><bean:write name="forums" property="key"/>=<bean:write name="forums"
property="value"/></td></tr>

</logic:iterate>
 
 

@summerian

Yes you are correct we do get the object using your method. Now the problem is a little bit more complicated.
I am already iterating a Map and key is an object. We use this object's property's  value is used as the key to the map i was talking about in your example "myMap": See the cod snippet

Hope you have a solution.... :-)

<s:iterator value="#session.outerMap.entrySet()" id="idQuestion">
/*This is Your idea that i have included this withing the myMap[], where <s:property value="key.strQuestionId"/> gives me a valid value on standalone but doesn't give when used with your idea like bleow*/
 
<s:property value='%{myMap[<s:property value="key.strQuestionId"/>]}'/>
 
</s:iterator>
                                              

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You cannot nest JSP tags into their attributes. The attribute-nested tag will not be executed (it will be treated as simple string value):

<example:tag1 attr="<example:tag2/>" />

But that's what you have languages like JSP EL, and OGNL.

Learn more about OGNL:

http://struts.apache.org/2.0.11.1/docs/ognl-basics.html

http://www.ognl.org/

Solution is below

<%you have to set map to a variable, because the action will not be on top of the value stack inside iterator tag%>
<s:set name="myMap" value="%{myMap}"/>
<s:iterator value="#session.outerMap.entrySet()" id="idQuestion">
 
<%refer to myMap through myMap variable %> 
<s:property value='%{#myMap[key.strQuestionId]}'/>
 
</s:iterator>

                                              

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@summerian

Hi I have given you the points for bringing some new ideas about OGNL to me. yeah i havent actually studied OGNL and thus the confusions. I'll sure;y refer the site given and understand it better.

:-)

By the way the last solution you gave was not working

Well, it might not worked, as I don't know what object you have in #session.outerMap as keys, and is this a copy of myMap (do you really have myMap property?), etc. :-)

Hi summerian

when i do like this <s:property value='%{#myMap}'/> all the elements (Key-Value(Object)) is displayed. Also passing value explicitly say <s:property value='%{#objAssessmentMap['71']}'/> also returns value correctly. but dynamically not working. i am sending you the whole thing just check out. outerMap is not a copy of myMap.

You have gained the points but still if you could help that would be great :-)

Thanks all you answered.

/*In Action the Map Property looks like this */
 
Map<Integer, Assess> myMap;
 
/*and the outer map is like this*/
Map<Question,List<Answer>> outerMap;
 
/*where Assess, Question, Answer are al objects with 
properties and setter and getters for the same. 
 
So the myMap.Integer and  outerMap.Question.strQuestionId 
represent the id from database. I want to compare it in the 
jsp and do some operations based on tht. SO tht explains why i need the value from the myMap */
 
 
/*Below sending the code once again with changes as you suggested*/
<s:set name="myMap" value="%{myMap}"/>
<s:iterator value="#session.outerMap.entrySet()" id="idQuestion">
 
 
	<tr>
	<td width="10%">&nbsp;</td>
	<td class="mandatory" valign="TOP">						 
	<s:property value="key.strQuestion"/>
	&nbsp;
	<s:property value='%{#myMap[key.strQuestionId]}'/>
	</td>
 
</s:iterator>

                                              

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Your code tries to do following (action variable is your action object, KeyObjectClass is class of keys in outer map) - code below.

That's my last post in this topic, if you want further discussion, then you must post another question - sorry.

Map myMap = action.getMyMap()
for(Object idQuestion : ((Map)session.get("outerMap")).entrySet()){
   //s:property
   System.out.println(myMap.get(((KeyObjectClass)idQuestionkey).getKey().getStrQuestionId());
)
}

                                              

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