枚举在JSP中 [英] Enum inside a JSP

问题描述

有没有办法在不使用scriptlet的情况下在JSP中使用Enum值。

例如。

  package com.example; 
 
 public enum Direction {
 ASC，
 DESC 
} 
  

所以在JSP中我想做这样的事情

 < c：if test = $ {foo.direction ==<％com.example.Direction.ASC％>}> ... 
  

解决方案

您可以将枚举中方向的网络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>这意味着你'重返天堂！< / p> 
<％}％> 
  
 

但是混合了视图和模型，虽然对于简单的用途，它可以是视图无关的（升序，降序等）。

除非你不喜欢将Java直接放入JSP页面，即使用于比较等基本内容/ p>

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 %>}">...

解决方案

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.

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