@validate校验中的@NotEmpty、@NotBlank、@NotNull区别

1、引入的包：jakarta.validation-api-2.0.2.jar

2、直接看源码上的注释

@NotEmpty

/**
 * The annotated element must not be {@code null} nor empty.
 * <p>
 * Supported types are:
 * <ul>
 * <li>{@code CharSequence} (length of character sequence is evaluated)</li>
 * <li>{@code Collection} (collection size is evaluated)</li>
 * <li>{@code Map} (map size is evaluated)</li>
 * <li>Array (array length is evaluated)</li>
 * </ul>
 *  * @author Emmanuel Bernard
 * @author Hardy Ferentschik
 *  * @since 2.0
 */
@Documented
@Constraint(validatedBy = { })
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
@Retention(RUNTIME)
@Repeatable(List.class)
public @interface NotEmpty {
	...
}

解释

• 此注解元素校验必须不为null且不为空
• 可以修饰的数据类型：
• CharSequence（字符串）
• Collection（集合）
• Map（键值对）
• Array（数组）

@NotBlank

/**
 * The annotated element must not be {@code null} and must contain at least one
 * non-whitespace character. Accepts {@code CharSequence}.
 *
 * @author Hardy Ferentschik
 * @since 2.0
 *
 * @see Character#isWhitespace(char)
 */
@Documented
@Constraint(validatedBy = { })
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
@Retention(RUNTIME)
@Repeatable(List.class)
public @interface NotBlank {
	...
}

解释

• 此注解元素校验必须不为null且必须包含一个不为空的字符串
• 只可以修饰的数据类型：CharSequence（字符串）

@NotNull

/**
 * The annotated element must not be {@code null}.
 * Accepts any type.
 *
 * @author Emmanuel Bernard
 */
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
@Retention(RUNTIME)
@Repeatable(List.class)
@Documented
@Constraint(validatedBy = { })
public @interface NotNull {
	...
}

解释

• 此注解元素校验必须不为null
• 接受任意类型的数据

3、用法示例

    /**
     * 员工ID
     */
    @NotEmpty(message = "员工id不能为空")
    private List<Integer> empIdList;


    /**
     * 客户id
     */
    @NotBlank(message = "公司名称不能为空")
    private String companyName;

    /**
     * 组织id
     */
    @NotNull(message = "组织ID不能为空")
    private String orgId;