Spring @Value空列表作为默认值 [英] Spring @Value empty list as default

问题描述

有没有一种方法可以将一个空列表设置为Spring中某个属性的默认值，例如:

Is there a way to set an empty list as default value for a property in Spring, something like:

@Value("${my.list.of.strings :" + new ArrayList<>() + "}")
private List<String> myList;

显然不是新的ArrayList，但是我在那里需要一个空列表.

Obviously not new ArrayList, but I need an empty list there instead.

推荐答案

在查看SpEL规范并结合@javaguy的答案后，我想到了:

After taking a look at SpEL specification and combined with @javaguy's answer I came up with this:

@Value("${my.list.of.strings:}#{T(java.util.Collections).emptyList()}")
private List<String> myList;

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