Spring：如何使用@Value注释注入内联字符串列表 [英] Spring: how to inject an inline list of strings using @Value annotation

问题描述

如何使用 @Value 注释注入字符串值列表。我正在使用Spring 4.1.2。

How do I inject a list of string values using the @Value annotation. I'm using Spring 4.1.2.

我试过：

@Value(value = "top, person, organizationalPerson, user")
private List<String> userObjectClasses

然后基于内联列表的spring el文档：

@Value(value = "{top, person, organizationalPerson, user}")
private List<String> userObjectClasses

这些尝试只注入给定值作为列表中唯一元素的字符串文字。

These attempts only inject a string literal of the value given as the only element in the list.

编辑

在这种情况下，我希望能够简单对值进行硬编码而不是从属性文件中读取。这种方法看起来不那么臭：

In this case, I'd like to be able to simply hard-code the values rather than read from a property file. This approach seems a little less smelly than:

private List<String> userObjectClasses = Arrays.asList(new String[] {"top", "person", "organizationalPerson", "user"});

过去，我使用spring的XML配置来连接bean，在这种情况下我可以做（假设bean有 userObjectClasses 属性的公共setter）：

In the past, I've used spring's XML configuration to wire up beans, and in that case I could do (assuming the bean had a public setter for the userObjectClasses property):

<property value="userObjectClass">
  <list>
    <value>top</value>
    <value>person</value>
    <value>organizationalPerson</value>
    <value>user</value>
  </list>
</property>

使用基于注释的配置时是否存在类似内容？

Is there an analog to this when using annotation based configuration?

推荐答案

list.of.strings =第一，第二，第三从属性文件中获取，例如

list.of.strings=first,second,third took from properties file for e.g.

然后使用 SpEL ：

 @Value("#{'${list.of.strings}'.split(',')}") 
 private List<String> list;

编辑

然后我认为你不需要为这类任务使用注释。您可以完成所有工作，就像您已经下载或 @PostConstruct 为了初始化一些字段。

Then I don't think that you need to use annotation for such type of tasks. You could do all work just like you've menitioned or in the @PostConstruct in order to initialize some fields.

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