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一、声明方法约束
package org.hibernate.validator.referenceguide.chapter03.parameter;
public class RentalStation {
public RentalStation(@NotNull String name) {
//...
}
public void rentCar(
@NotNull Customer customer,
@NotNull @Future Date startDate,
@Min(1) int durationInDays) {
//...
}
}
-
RentalStation的name不能为空 -
rentCar()，customer不能为空，startDate不能为空且必须在未来，durationInDays最少为1天
1. 交叉参数约束
public class Car {
@LuggageCountMatchesPassengerCount(piecesOfLuggagePerPassenger = 2)
public void load(List<Person> passengers, List<PieceOfLuggage> luggage) {
//...
}
}
该注解通过自动义确保乘客携带不超过2件行李文章来源：https://www.toymoban.com/news/detail-676142.html
2. 返回值约束
package org.hibernate.validator.referenceguide.chapter03.returnvalue;
public class RentalStation {
@ValidRentalStation
public RentalStation() {
//...
}
@NotNull
@Size(min = 1)
public List<@NotNull Customer> getCustomers() {
//...
return null;
}
}
-
任何新创建的 RentalStation对象必须满足@ValidRentalStation约束 -
传回的客户清单 getCustomers()不得为null并且必须至少包含元素 -
返回的客户清单 getCustomers()不得包含任何null对象
3. 级联验证
package org.hibernate.validator.referenceguide.chapter03.cascaded;
public class Garage {
@NotNull
private String name;
@Valid
public Garage(String name) {
this.name = name;
}
public boolean checkCar(@Valid @NotNull Car car) {
//...
return false;
}
}
package org.hibernate.validator.referenceguide.chapter03.cascaded;
public class Car {
@NotNull
private String manufacturer;
@NotNull
@Size(min = 2, max = 14)
private String licensePlate;
public Car(String manufacturer, String licencePlate) {
this.manufacturer = manufacturer;
this.licensePlate = licencePlate;
}
//getters and setters ...
}
-
验证checkCar()方法的参数时，还将Car评估对所传递对象的属性的约束。同样，在验证构造函数的返回值时@NotNull，Garage将检查对name字段的约束 Garage。 -
通常，级联验证对可执行文件的工作方式与对JavaBeans属性完全相同。 -
特别是，null在级联验证期间会忽略值，并且递归执行级联验证
package org.hibernate.validator.referenceguide.chapter03.cascaded.containerelement;
public class Garage {
public boolean checkCars(@NotNull List<@Valid Car> cars) {
//...
return false;
}
}
4. 继承层次结构中的方法约束
-
需要注意的规则 -
方法的调用者必须满足的前提条件不能在子类型中得到加强 -
保证方法调用者的后置条件不会在子类型中减弱
-
-
子类非法的方法参数约束
package org.hibernate.validator.referenceguide.chapter03.inheritance.parameter;
public interface Vehicle {
void drive(@Max(75) int speedInMph);
}
package org.hibernate.validator.referenceguide.chapter03.inheritance.parameter;
public class Car implements Vehicle {
@Override
public void drive(@Max(55) int speedInMph) {
//...
}
}
-
次结构的并行类型中的非法方法参数约束
package org.hibernate.validator.referenceguide.chapter03.inheritance.parallel;
public interface Vehicle {
void drive(@Max(75) int speedInMph);
}
package org.hibernate.validator.referenceguide.chapter03.inheritance.parallel;
public interface Car {
void drive(int speedInMph);
}
package org.hibernate.validator.referenceguide.chapter03.inheritance.parallel;
public class RacingCar implements Car, Vehicle {
@Override
public void drive(int speedInMph) {
//...
}
}
-
父类型和子类型方法的返回值约束
package org.hibernate.validator.referenceguide.chapter03.inheritance.returnvalue;
public interface Vehicle {
@NotNull
List<Person> getPassengers();
}
package org.hibernate.validator.referenceguide.chapter03.inheritance.returnvalue;
public class Car implements Vehicle {
@Override
@Size(min = 1)
public List<Person> getPassengers() {
//...
return null;
}
}
二、验证方法约束
再来一辆车
class Car2 {
public Car2(@NotNull String manufacturer) {
}
@自定义规则
public Car2() {
}
public void drive(@Max(75) @Min(22) int speedInMph) {
}
@Size(min = 1)
public List getParams() {
return null;
}
}
获取工具
1. 校验普通方法参数
2. 测试普通方法返回值
3. 测试构造方法参数
4. 测试构造方法的返回值
三、内置方法约束
package org.hibernate.validator.referenceguide.chapter03.parameterscriptassert;
public class Car {
@ParameterScriptAssert(lang = "javascript", script = "luggage.size() <= passengers.size() * 2")
public void load(List<Person> passengers, List<PieceOfLuggage> luggage) {
//...
}
}
``` //...
}
}
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