Of course supplying getters for your constant values would work like a
charm for JSTL ;-)
Rick Reumann wrote:
Woodchuck wrote:
how can i do the following the non-scriptlet way on my jsp page?
<%@ page import="MyPackage.Constants"%>
<%= Constants.BUTTON__KEY %>
is there an elegant Struts or JSTL equivalent for the above?
Thankfully Kris Schneider demonstrated a good way to handle this...
In your Constants class add a method similar to this:
public static Map getConstantsMap() {
Map propMap = null;
try {
Field[] allFields = Constants.class.getDeclaredFields();
int numFields = allFields.length;
propMap = new HashMap(numFields);
for(int i = 0; i < numFields; i++) {
Field f = allFields[i];
int mods = f.getModifiers();
if(Modifier.isPublic(mods) && Modifier.isStatic(mods) &&
Modifier.isFinal(mods)) {
String name = f.getName();
Object value = f.get(null);
propMap.put(name, value);
}
}
} catch(IllegalAccessException ie) {
log.error("Problem loading getConstantsMap " + ie);
}
return Collections.unmodifiableMap(propMap);
}
Then, I have a Servlet that runs on applications startup (such as a
ServletContextListener) that will load the constants map into
application scope:
ServletContext context = contextEvent.getServletContext();
try {...
context.setAttribute("CONSTANTS", Constants.getConstantsMap());
Now anywhere in your JSPs you can just use the Map
${CONSTANTS.SOME_CONSTANT}
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