如果你使用Hibernate Validator 4.1作为你的JSR-303实现，他们提供 @NotBlank 注释完全符合您的要求，与@NotNull和@NotEmpty分开。您需要使用（当前）最新版本，但这将有效。

If you use Hibernate Validator 4.1 as your JSR-303 implementation, they provide a @NotBlank annotation that does EXACTLY what you're looking for, separate from @NotNull and @NotEmpty. You need to be using the (currently) latest version, but that will work.

如果由于某种原因无法转到最新版本，则不会需要花很多时间自己写一个注释。

If you can't go to the latest version for some reason, it doesn't take much to write an annotation yourself.