基于aspectj的introduce实现

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本文链接： https://blog.csdn.net/drxRose/article/details/100575503

siye@r480:~/svlution/workspace/springcore4322$ tree src/
src/
├── main
│   ├── java
│   │   ├── log4j.properties
│   │   └── ocn
│   │       └── site
│   │           └── springaop
│   │               ├── advice
│   │               │   └── LogUser.java
│   │               ├── setup
│   │               │   └── Appconfig.java
│   │               └── target
│   │                   ├── PersonImpl.java
│   │                   ├── Person.java
│   │                   ├── UserImpl.java
│   │                   └── User.java
│   └── resources
└── test
    ├── java
    │   └── ocn
    │       └── site
    │           └── springaop
    │               └── target
    │                   └── Runtest.java
    └── resources
        └── config
            └── application.xml

17 directories, 9 files

<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.3.22.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjrt -->
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjrt</artifactId>
    <version>1.9.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.9.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.9.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/junit/junit -->
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
    <scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>4.3.22.RELEASE</version>
    <scope>test</scope>
</dependency>

package ocn.site.springaop.advice;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.DeclareParents;
import org.springframework.stereotype.Component;

import ocn.site.springaop.target.Person;
import ocn.site.springaop.target.PersonImpl;

//@Aspect // java-config配置的时候开启此注解
@SuppressWarnings("unused")
@Component
public class LogUser {

	// 引入通知是aop中的一种技术实现，在实际使用中个人感觉很少使用。
	// 此举仅作学习了解。

//	@DeclareParents 向目标类,引入指定接口的实现
//	value : 指定目标类,符号+表示接口的所有实现类
//	defaultImpl : 引入指定接口的实现类
//
//	补充:测试环境中使用面向接口编程特性.
	@DeclareParents(value = "ocn.site.springaop.target.User+", defaultImpl = PersonImpl.class)
	public Person person;

}

package ocn.site.springaop.setup;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@Configuration
@ComponentScan({ "ocn.site.springaop.advice", "ocn.site.springaop.target" })
@EnableAspectJAutoProxy(proxyTargetClass = true)
public class Appconfig {

}

package ocn.site.springaop.target;

public interface Person {

	public void eat();

}

package ocn.site.springaop.target;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Component;

@Component
public class PersonImpl implements Person {

	private final Logger logger = Logger.getLogger(this.getClass());

	@Override
	public void eat() {
		logger.info("补充能量");
	}

}

package ocn.site.springaop.target;

public interface User {

	public void work();

}

package ocn.site.springaop.target;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Component;

@Component
public class UserImpl implements User {
	private final Logger logger = Logger.getLogger(this.getClass());

	@Override
	public void work() {
		logger.info("工作任务");
	}

}

package ocn.site.springaop.target;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringRunner;

import ocn.site.springaop.setup.Appconfig;

@SuppressWarnings("unused")
@RunWith(SpringRunner.class)
//@ContextConfiguration(classes = Appconfig.class)
@ContextConfiguration("classpath:config/application.xml")
public class Runtest {

	private @Autowired User user;

	@Test
	public void run() throws Exception {
		user.work();
		Person person = (Person) user;
		person.eat();
	}

}

<?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">

	<aop:aspectj-autoproxy proxy-target-class="true"></aop:aspectj-autoproxy>

	<bean class="ocn.site.springaop.target.UserImpl"></bean>
	<bean class="ocn.site.springaop.target.PersonImpl"></bean>
	<bean id="logUser" class="ocn.site.springaop.advice.LogUser"></bean>

	<aop:config>
		<aop:aspect ref="logUser">
			<aop:declare-parents types-matching="ocn.site.springaop.target.User+"
				implement-interface="ocn.site.springaop.target.Person" default-impl="ocn.site.springaop.target.PersonImpl" />
		</aop:aspect>
	</aop:config>

</beans>

19-09-06 10:51:38 org.springframework.test.context.support.DefaultTestContextBootstrapper  =====>>> Loaded default TestExecutionListener class names from location [META-INF/spring.factories]: [org.springframework.test.context.web.ServletTestExecutionListener, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener, org.springframework.test.context.support.DependencyInjectionTestExecutionListener, org.springframework.test.context.support.DirtiesContextTestExecutionListener, org.springframework.test.context.transaction.TransactionalTestExecutionListener, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener]
19-09-06 10:51:38 org.springframework.test.context.support.DefaultTestContextBootstrapper  =====>>> Using TestExecutionListeners: [org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener@180bc464, org.springframework.test.context.support.DependencyInjectionTestExecutionListener@1324409e, org.springframework.test.context.support.DirtiesContextTestExecutionListener@2c6a3f77]
19-09-06 10:51:38 org.springframework.beans.factory.xml.XmlBeanDefinitionReader  =====>>> Loading XML bean definitions from class path resource [config/application.xml]
19-09-06 10:51:38 org.springframework.context.support.GenericApplicationContext  =====>>> Refreshing org.springframework.context.support.GenericApplicationContext@5034c75a: startup date [Fri Sep 06 10:51:38 CST 2019]; root of context hierarchy
19-09-06 10:51:39 ocn.site.springaop.target.UserImpl  =====>>> 工作任务
19-09-06 10:51:39 ocn.site.springaop.target.PersonImpl  =====>>> 补充能量
19-09-06 10:51:39 org.springframework.context.support.GenericApplicationContext  =====>>> Closing org.springframework.context.support.GenericApplicationContext@5034c75a: startup date [Fri Sep 06 10:51:38 CST 2019]; root of context hierarchy