spring 注解@Conditional的用法
@Conditional的用法
package com.condition; import org.springframework.context.annotation.Condition; import org.springframework.context.annotation.ConditionContext; import org.springframework.core.type.AnnotatedTypeMetadata; /** * @auto dh * @create 2020-04-25-15:11 */ public class Condition001 implements Condition { @Override public boolean matches(ConditionContext context, AnnotatedTypeMetadata annotatedTypeMetadata) { // context 代表Ioc容器 context.getBeanFactory 从Ioc容器里获取容器工厂 // 调用该容器工厂,判断是否包含该bean名为animal if(context.getBeanFactory().containsBean("animal")){ return true; } return false; } }
package com.configuration; import com.bean.Animal; import com.bean.Person; import com.condition.Condition001; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Conditional; import org.springframework.context.annotation.Configuration; /** * @auto dh * @create 2020-04-25-15:15 */ @Configuration public class ConditionTest001 { // @Bean public Animal animal() { return new Animal(); } @Bean // 如果Condition001.class返回true,则加载该bean, // 否则不加载该bean @Conditional(Condition001.class) public Person person() { return new Person(); } }