Spring MethodInterceptor 使用

 

 

==================== 模擬一個需求， 接口調用時，打一下日志====================

1.  定義一個注解

@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface TraceLog {
}

2.  實現method interceptor 接口

@Slf4j
public class MyMethodInterceptor implements MethodInterceptor {
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        try {
            Object result = invocation.proceed();
            log.info("MyMethodInterceptor interceptor...." + invocation.getMethod());
            return result;
        } catch (Exception e) {
            log.info("MyMethodInterceptor interceptor...." + e);
            throw  e;
        }
    }
}

 

3. 新建一個配置文件  springContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    <bean id="myMethodInterceptor" class="com.example.docker.aop.MyMethodInterceptor"/>  // 注入自定義的interceptor


    <aop:config>
        <!--<aop:advisor pointcut="execution(* com.example.docker.service.impl.*.*(..))" advice-ref="myMethodInterceptor" />-->

        <!--<aop:advisor pointcut="@within(com.example.docker.annotation.TraceLog)" advice-ref="myMethodInterceptor" />-->

        <aop:advisor pointcut="@annotation(com.example.docker.annotation.TraceLog)" advice-ref="myMethodInterceptor" />   // within 和 @within 的區別，后者時對於注解來說的。  @within 和 @anntation區別 后者是方法級別,前者為類級別
        
    </aop:config>
</beans>

4,   啟動類加載配置文件

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@ImportResource("classpath:springContext.xml")
public class DockerDemoApplication {

    public static void main(String[] args) {
       SpringApplication.run(DockerDemoApplication.class, args);
    }

}