自定义@interface及groups校验

一、自定义annotation

摘自：http://elim.iteye.com/blog/1812584

1. @Target({ElementType.FIELD, ElementType.METHOD})

2. @Retention(RetentionPolicy.RUNTIME)

3. @Constraint(validatedBy=MinValidator.class)

4. public @interface Min {

5. int value() default 0;

6. String message();

7. Class[] groups() default {};

8. Classextends Payload>[] payload() default {};

9. }

1. public class MinValidator implements ConstraintValidator {

2. private int minValue;

3. public void initialize(Min min) {

4. // TODO Auto-generated method stub

5. //把Min限制类型的属性value赋值给当前ConstraintValidator的成员变量minValue

6. minValue = min.value();

7. }

8. public boolean isValid(Integer value, ConstraintValidatorContext arg1) {

9. // TODO Auto-generated method stub

10. //在这里我们就可以通过当前ConstraintValidator的成员变量minValue访问到当前限制类型Min的value属性了

11. return value >= minValue;

12. }

13. }

14. public class User {

15. private int age;

    
    

16. @Min(value=8, message="年龄不能小于8岁")

17. public int getAge() {

18. return age;

19. }

20. public void setAge(int age) {

21. this.age = age;

22. }

23. 
    

24. }

二、group校验

public class Student implements Serializable {        private static final long serialVersionUID = 1L;        @NotBlank(message = "名称不能为空", groups = { First.class })        private String name;        @NotBlank(message = "年龄不能为空", groups = { Second.class })        private String age;        ...省略get set方法}public @interface First {}public @interface Second {}public static void main(String[] args){      Student student = new Student();      ValidatorFactory vf = Validation.buildDefaultValidatorFactory();     Validator validator = vf.getValidator();      Set> set = validator.validate(student,First.class);      for (ConstraintViolation constraintViolation : set) {          System.out.println(constraintViolation.getMessage());      }}

参考：

http://elim.iteye.com/blog/1812584

http://blog.csdn.net/gaoshanliushui2009/article/details/50667017