Using JSTL how to “put” a value into a HashMap

Question

I'm looking to set the key value pairing of a HashMap using JSTL only. Is this possible?

I know how to retrieve the key value pairs, but I haven't found a way to set them.

Any help would be appreciated.

Example of retrieving HashMap key/value pairs using JSTL:

<c:forEach var="hash" items="${myHashMap}">             
    <c:out value="${hash.key}" />
    <c:out value="${hash.value}" />
...

Answer 1

您可以使用<c:set> 。

<c:set target="${myHashMap}" property="key" value="value"/> 

Answer 2

I wouldn't use JSTL to do that, but straight-up JSP will get it done...

<%
myHashMap.put("hello", "world");
%>