javax.validation.constraints中@NotEmpty,@NotNull,@NotBlank

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@NotEmpty

The annotated element must not be {@code null} nor empty. Supported types are:
不能是null
不能是空字符
集合框架中的元素不能为空

@NotNul

被修饰元素不能为null

@NotBlank

The annotated element must not be {@code null} and must contain at least one
non-whitespace character.
这个注解用来判断字符串或者字符