一、自定义annotation
摘自：http://elim.iteye.com/blog/1812584
@Target({ElementType.FIELD, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy=MinValidator.class)
public @interface Min {
int value() default 0;
String message();
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
public class MinValidator implements ConstraintValidator<Min, Integer> {
private int minValue;
public void initialize(Min min) {
// TODO Auto-generated method stub
//把Min限制类型的属性value赋值给当前ConstraintValidator的成员变量minValue
minValue = min.value();
}
public boolean isValid(Integer value, ConstraintValidatorContext arg1) {
// TODO Auto-generated method stub
//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
return value >= minValue;
}
}
public class User {
private int age;
@Min(value=8, message="年龄不能小于8岁")
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
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<ConstraintViolation<student>> set = validator.validate(student,First.class);
for (ConstraintViolation<student> constraintViolation : set) {
System.out.println(constraintViolation.getMessage());
}
}参考：
http://elim.iteye.com/blog/1812584
http://blog.csdn.net/gaoshanliushui2009/article/details/50667017
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