Get value from hashmap based on key to JSTL
I want to get the value of HashMap
based on key.
HashMap<String, ArrayList<String>> map
= new HashMap<String, ArrayList<String>>();
ArrayList<String> arrayList = new ArrayList<String>();
map.put("key", arrayList);
request.setAttribute("key", map);
What i did is
<c:forEach var="map" items="${requestScope.key}">
<c:forEach var="hash" items="${map.value}">
<option><c:out value="${hash}"/></option>
</c:forEach>
</c:forEach>
But it seems it's printing everything, what i want to do is to get the value depends on key like: hash.key
or something
UPDATE:
I did something like this but it still doesn't work
<c:forEach var="map" items="${requestScope.key}">
<c:forEach var="hash" items="${map['key']}">
<option><c:out value="${hash}"/></option>
</c:forEach>
</c:forEach>
and the StackTrace: Property 'External' not found on type java.util.HashMap$Entry
I'm pretty sure that there is really that kind of key.
if all you're trying to do is get the value of a single entry in a map, there's no need to loop over any collection at all. simplifying gautum's response slightly, you can get the value of a named map entry as follows:
<c:out value="${map['key']}"/>
where 'map' is the collection and 'key' is the string key for which you're trying to extract the value.
could you please try below code
<c:forEach var="hash" items="${map['key']}">
<option><c:out value="${hash}"/></option>
</c:forEach>