12.6. 示例
假设我们有一个带有以下注解的 java bean
Car.java
public class Car {
@NotNull
private String manufacturer;
@NotNull
@Size(min = 5, max = 14, groups = OptionalChecks.class)
private String licensePlate;
// getter and setter
}
以及自定义验证组的接口定义
OptionalChecks.java
public interface OptionalChecks {
}
使用以下 Camel 路由时，只有属性制造商和 licensePlate 的 @NotNull 约束才会被验证(Camel 使用默认组 javax.validation.groups.Default)。
from("direct:start")
.to("bean-validator://x")
.to("mock:end")
如果要从组 OptionalChecks 中检查约束，则必须定义路由，如下所示
from("direct:start")
.to("bean-validator://x?group=OptionalChecks")
.to("mock:end")如果要从这两个组中检查约束，您必须首先定义一个新接口
AllChecks.java
@GroupSequence({Default.class, OptionalChecks.class})
public interface AllChecks {
}
然后您的路由定义应类似如下
from("direct:start")
.to("bean-validator://x?group=AllChecks")
.to("mock:end")如果需要提供自己的消息插入器、遍历解析器和约束验证器工厂，您必须编写如下路由：
<bean id="myMessageInterpolator" class="my.ConstraintValidatorFactory" /> <bean id="myTraversableResolver" class="my.TraversableResolver" /> <bean id="myConstraintValidatorFactory" class="my.ConstraintValidatorFactory" />
from("direct:start")
.to("bean-validator://x?group=AllChecks&messageInterpolator=#myMessageInterpolator
&traversableResolver=#myTraversableResolver&constraintValidatorFactory=#myConstraintValidatorFactory")
.to("mock:end")
也可以将约束描述为 XML，而不是作为 Java 注解描述。在这种情况下，您必须提供文件 META-INF/validation.xml，该文件可能如下所示
validation.xml
<validation-config
xmlns="http://jboss.org/xml/ns/javax/validation/configuration"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://jboss.org/xml/ns/javax/validation/configuration">
<default-provider>org.hibernate.validator.HibernateValidator</default-provider>
<message-interpolator>org.hibernate.validator.engine.ResourceBundleMessageInterpolator</message-interpolator>
<traversable-resolver>org.hibernate.validator.engine.resolver.DefaultTraversableResolver</traversable-resolver>
<constraint-validator-factory>org.hibernate.validator.engine.ConstraintValidatorFactoryImpl</constraint-validator-factory>
<constraint-mapping>/constraints-car.xml</constraint-mapping>
</validation-config>
和 constraints-car.xml 文件
constraints-car.xml
<constraint-mappings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://jboss.org/xml/ns/javax/validation/mapping validation-mapping-1.0.xsd"
xmlns="http://jboss.org/xml/ns/javax/validation/mapping">
<default-package>org.apache.camel.component.bean.validator</default-package>
<bean class="CarWithoutAnnotations" ignore-annotations="true">
<field name="manufacturer">
<constraint annotation="javax.validation.constraints.NotNull" />
</field>
<field name="licensePlate">
<constraint annotation="javax.validation.constraints.NotNull" />
<constraint annotation="javax.validation.constraints.Size">
<groups>
<value>org.apache.camel.component.bean.validator.OptionalChecks</value>
</groups>
<element name="min">5</element>
<element name="max">14</element>
</constraint>
</field>
</bean>
</constraint-mappings>
以下是 OrderedChecks 示例路由定义的 XML 语法。
请注意，正文应包含要验证的类实例。
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">
<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
<route>
<from uri="direct:start"/>
<to uri="bean-validator://x?group=org.apache.camel.component.bean.validator.OrderedChecks"/>
</route>
</camelContext>
</beans>