Two ways of writing aspect and advisor for Spring AOP

This article transferred from: https://www.cnblogs.com/leiOOlei/p/3709607.html

First look at an example, as follows

Interface code:

 Package Com.lei.demo.aop.schema;  Public Interface Ihello {    publicvoid  SayHello ();}

Interface implementation:

 Package Com.lei.demo.aop.schema;  Public class Implements Ihello {    publicvoid  SayHello () {        System.out.println ("-----Hello World !-----");    }}

The next step is to implement AOP, which is to cut into notifications when calling the SayHello method.

1. The first method configures Aop:pointcut and Aop:aspect in Aop:config

Define a facet support class Helloaspect.java

 PackageCom.lei.demo.aop.schema;/** Slice support class*/ Public classHelloaspect {//front-facing notifications     Public voidBeforeadvice () {System.out.println ("===========before Advice"); }        //Post Final notification     Public voidAfterfinallyadvice () {System.out.println ("===========after Finally Advice"); }}

XML configuration: Spring-aop-schema.xml

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "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/SPR Ing-beans-3.2.xsd HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP http://www.springframework.org/schema/ Aop/spring-aop-3.2.xsd ">               <!--Target Class -    <BeanID= "HelloService"class= "Com.lei.demo.aop.schema.HelloService" />        <BeanID= "Helloaspect"class= "Com.lei.demo.aop.schema.HelloAspect" />            <!--Configure Facets -    <!--Aop:advisor, there is Order, must be placed after Aop:pointcut -    <Aop:config>        <Aop:pointcutID= "Hellopointcut"expression= "Execution (* com.lei.demo.aop.schema). *.*(..))" />                <Aop:aspectref= "Helloaspect">            <!-The following two methods are used to define pointcuts Pointcut-ref and pointcut-->            <Aop:beforePointcut-ref= "Hellopointcut"Method= "Beforeadvice" />            <Aop:afterpointcut= "Execution (* com.lei.demo.aop.schema). *.*(..))"Method= "Afterfinallyadvice" />        </Aop:aspect>                    </Aop:config></Beans>

In the above configuration method="Beforeadvice",method="Afterfinallyadvice" corresponding to the method in Helloaspect

Test, App.java

 PackageCom.lei.demo.aop.schema;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext; Public classApp {Private StaticApplicationContext CTX;  Public Static voidMain (string[] args) {CTX=NewClasspathxmlapplicationcontext ("Spring-aop-schema.xml"); Ihello HelloService= Ctx.getbean ("HelloService", Ihello.class);    Helloservice.sayhello (); }}

Run App.java with the following results:

===========before Advice

-----Hello World!-----

===========after finally advice

2. The second method configures Aop:pointcut and Aop:advisor in Aop:config

Implement the Org.aopalliance.intercept.MethodInvocation interface,

Helloaroundadvice.java as follows:

 PackageCom.lei.demo.aop.schema;ImportJava.lang.reflect.Method;ImportOrg.aopalliance.intercept.MethodInterceptor;Importorg.aopalliance.intercept.MethodInvocation; Public classHelloaroundadviceImplementsMethodinterceptor { PublicObject Invoke (Methodinvocation arg0)throwsthrowable {System.out.println ("++++++before Advice");        Arg0.proceed (); System.out.println ("++++++after Advice"); return NULL; }}

XML configuration: Spring-aop-schema.xml

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "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/SPR Ing-beans-3.2.xsd HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP http://www.springframework.org/schema/ Aop/spring-aop-3.2.xsd ">               <!--Target Class -    <BeanID= "HelloService"class= "Com.lei.demo.aop.schema.HelloService" />        <BeanID= "Helloarroundadvice"class= "Com.lei.demo.aop.schema.HelloAroundAdvice" />        <!--Configure Facets -    <Aop:config>        <Aop:pointcutID= "Hellopointcut"expression= "Execution (* com.lei.demo.aop.schema). *.*(..))" />        <Aop:advisorAdvice-ref= "Helloarroundadvice"Pointcut-ref= "Hellopointcut"/>            </Aop:config></Beans>

Still running App.java, the results are as follows:

++++++before Advice

-----Hello World!-----

++++++after Advice

Two ways of writing aspect and advisor for Spring AOP