迭代JSP中的枚举常数 [英] iterating over Enum constants in JSP

问题描述

我有这样的枚举

  package com.example; 
 
 public enum CoverageEnum {
 
 COUNTRY，
 REGIONAL，
 COUNTY 
} 
  / pre> 
 
 
我想在JSP中迭代这些常量，而不使用scriptlet代码。我知道我可以用这样的scriptlet代码：
 < c：forEach var =typeitems =< ;％= com.example.CoverageEnum.values（）％>> 
 $ {type} 
< / c：forEach> 
  
但是我可以在没有scriptlet的情况下实现同样的事情吗？
 
 
 
 Cheers，
 Don 
解决方案
如果您使用Spring MVC，您可以通过以下语法祝福：
 < form：form method =postmodelAttribute =clustercssClass =formenctype = 多部分/格式数据 > 
< form：label path =clusterType>集群类型
< form：errors path =clusterTypecssClass =error/> 
< / form：label> 
< form：select items =$ {clusterTypes}var =typepath =clusterType/> 
< / form：form> 
  
您的模型属性（即，要填充的bean /数据实体）被命名为集群，您已经使用名为clusterTypes的枚举数组填充模型。 < form：error> 部分是非常可选的。 
 
 
 
在Spring MVC版块中，您还可以将 clusterTypes 自动填充到您的模型中，如下
  @ModelAttribute（clusterTypes）
 public MyClusterType [] populateClusterTypes（）{
 return MyClusterType.values（）; 
} 
  
 
I have an Enum like this
package com.example;

public enum CoverageEnum {

    COUNTRY,
    REGIONAL,
    COUNTY
}
I would like to iterate over these constants in JSP without using scriptlet code. I know I can do it with scriptlet code like this:
<c:forEach var="type" items="<%= com.example.CoverageEnum.values() %>">
    ${type}
</c:forEach>
But can I achieve the same thing without scriptlets?

Cheers,
Don
解决方案
If you're using Spring MVC, you can accomplish your goal with the following syntactic blessing:
 <form:form method="post" modelAttribute="cluster" cssClass="form" enctype="multipart/form-data">
   <form:label path="clusterType">Cluster Type
      <form:errors path="clusterType" cssClass="error" />
   </form:label>
   <form:select items="${clusterTypes}" var="type" path="clusterType"/>
 </form:form>
where your model attribute (ie, bean/data entity to populate) is named cluster and you have already populated the model with an enum array of values named clusterTypes. The <form:error> part is very much optional. 

In Spring MVC land, you can also auto-populate clusterTypes into your model like this
@ModelAttribute("clusterTypes")
public MyClusterType[] populateClusterTypes() {
    return MyClusterType.values();
}


                        
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