Java JSP 中的枚举
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Enum inside a JSP
提问by talg
Is there a way to use Enum values inside a JSP without using scriptlets.
有没有办法在不使用 scriptlet 的情况下在 JSP 中使用枚举值。
e.g.
例如
package com.example;
public enum Direction {
ASC,
DESC
}
so in the JSP I want to do something like this
所以在 JSP 中我想做这样的事情
<c:if test="${foo.direction ==<% com.example.Direction.ASC %>}">...
采纳答案by JeeBee
You could implement the web-friendly text for a direction within the enum as a field:
您可以将枚举中的方向的 Web 友好文本实现为字段：
<%@ page import="com.example.Direction" %>
...
<p>Direction is <%=foo.direction.getFriendlyName()%></p>
<% if (foo.direction == Direction.ASC) { %>
<p>That means you're going to heaven!</p>
<% } %>
but that mixes the view and the model, although for simple uses it can be view-independent ("Ascending", "Descending", etc).
但这混合了视图和模型，尽管对于简单的使用，它可以独立于视图（“升序”、“降序”等）。
Unless you don't like putting straight Java into your JSP pages, even when used for basic things like comparisons.
除非您不喜欢将 Java 直接放入 JSP 页面，即使用于比较等基本内容也是如此。
回答by Arnoud
You can simply check against the enum value as a string:
您可以简单地将枚举值作为字符串进行检查：
<c:if test="${foo.direction == 'ASC'}">...
回答by Mohammed Aslam
It can be done like this I guess
我想它可以像这样完成
<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
优点是当我们重构时它也会在这里重命名
