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

@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爲空web @NotNul 被修飾元素不能爲null框架 @NotBlank The annotated element must not be {@code null}

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