问题
Is there a way to use Enum values inside a JSP without using scriptlets.
e.g.
package com.example;
public enum Direction {
ASC,
DESC
}
so in the JSP I want to do something like this
<c:if test="${foo.direction ==<% com.example.Direction.ASC %>}">...
回答1:
You could implement the web-friendly text for a direction within the enum as a field:
<%@ page import="com.example.Direction" %>
...
<p>Direction is <%=foo.direction.getFriendlyName()%></p>
<% if (foo.direction == Direction.ASC) { %>
<p>That means you're going to heaven!</p>
<% } %>
but that mixes the view and the model, although for simple uses it can be view-independent ("Ascending", "Descending", etc).
Unless you don't like putting straight Java into your JSP pages, even when used for basic things like comparisons.
回答2:
It can be done like this I guess
<c:set var="ASC" value="<%=Direction.ASC%>"/>
<c:if test="${foo.direction == ASC}"></c:if>
the advantage is when we refactor it will rename here too
回答3:
You can simply check against the enum value as a string:
<c:if test="${foo.direction == 'ASC'}">...
来源：https://stackoverflow.com/questions/163407/enum-inside-a-jsp