java request常用的注解

NotBlank:用于字符串
NotNull/NotEmpty:用于集合

@NotNull: The CharSequence, Collection, Map or Array object is not null, but can be empty.
@NotEmpty: The CharSequence, Collection, Map or Array object is not null and size > 0.
@NotBlank: The string is not null and the trimmed length is greater than zero.