使用Spring的注解方式实现AOP

Spring对AOP的实现提供了很好的支持。下面我们就使用Spring的注解来完成AOP做一个例子。

首先，为了使用Spring的AOP注解功能，必须导入如下几个包。aspectjrt.jar,aspectjweaver.jar,cglib-nodep.jar.

然后我们写一个接口

[java]
view plaincopyprint?

package com.bird.service;

public interface PersonServer {

public
void save(String name);
public void update(String name, Integer id);

public String getPersonName(Integer id);

}

[java]
view plaincopyprint?

package com.bird.service;

public interface PersonServer {

public void save(String name);

public void update(String name, Integer id);

public String getPersonName(Integer id);

}

package com.bird.service;

public interface PersonServer {

public void save(String name);
public void update(String name, Integer id);
public String getPersonName(Integer id);

}

和一个接口实现类

[java]
view plaincopyprint?

package com.bird.service.impl;

import com.bird.service.PersonServer;

public class PersonServiceBean
implements PersonServer{

@Override

public void save(String name) {

System.out.println("我是save方法");

// throw new RuntimeException();

}

@Override
public
void update(String name, Integer id) {

System.out.println("我是update()方法");

}

@Override
public String getPersonName(Integer id) {

System.out.println("我是getPersonName()方法");

return "xxx";

}

}

[java]
view plaincopyprint?

package com.bird.service.impl;

import com.bird.service.PersonServer;

public class PersonServiceBean
implements PersonServer{

@Override

public void save(String name) {

System.out.println("我是save方法");

// throw new RuntimeException();

}

@Override
public void update(String name, Integer id) {

System.out.println("我是update()方法");

}

@Override
public String getPersonName(Integer id) {

System.out.println("我是getPersonName()方法");

return "xxx";

}

}

package com.bird.service.impl;

import com.bird.service.PersonServer;

public class PersonServiceBean implements PersonServer{

@Override
public void save(String name) {

System.out.println("我是save方法");
//	throw new RuntimeException();
}

@Override
public void update(String name, Integer id) {

System.out.println("我是update()方法");
}

@Override
public String getPersonName(Integer id) {

System.out.println("我是getPersonName()方法");
return "xxx";
}

}

下面使用Spring注解方式对这个Bean进行方法拦截

[java]
view plaincopyprint?

package com.bird.service;

import org.aspectj.lang.ProceedingJoinPoint;

import org.aspectj.lang.annotation.After;

import org.aspectj.lang.annotation.AfterReturning;

import org.aspectj.lang.annotation.AfterThrowing;

import org.aspectj.lang.annotation.Around;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Before;

import org.aspectj.lang.annotation.Pointcut;

/**
* 切面
* @author Bird
*
*/
@Aspect

public class MyInterceptor {

@Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")

private void anyMethod(){}//定义一个切入点

@Before("anyMethod() && args(name)")

public
void doAccessCheck(String name){
System.out.println(name);
System.out.println("前置通知");

}

@AfterReturning("anyMethod()")

public
void doAfter(){
System.out.println("后置通知");

}

@After("anyMethod()")

public void after(){

System.out.println("最终通知");

}

@AfterThrowing("anyMethod()")

public
void doAfterThrow(){
System.out.println("例外通知");

}

@Around("anyMethod()")

public Object doBasicProfiling(ProceedingJoinPoint pjp)
throws Throwable{
System.out.println("进入环绕通知");

Object object = pjp.proceed();//执行该方法

System.out.println("退出方法");

return object;

}
}

[java]
view plaincopyprint?

package com.bird.service;

import org.aspectj.lang.ProceedingJoinPoint;

import org.aspectj.lang.annotation.After;

import org.aspectj.lang.annotation.AfterReturning;

import org.aspectj.lang.annotation.AfterThrowing;

import org.aspectj.lang.annotation.Around;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Before;

import org.aspectj.lang.annotation.Pointcut;

/**
* 切面
* @author Bird
*
*/
@Aspect
public class MyInterceptor {

@Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")

private void anyMethod(){}//定义一个切入点

@Before("anyMethod() && args(name)")

public void doAccessCheck(String name){

System.out.println(name);
System.out.println("前置通知");

}

@AfterReturning("anyMethod()")

public void doAfter(){

System.out.println("后置通知");

}

@After("anyMethod()")

public void after(){

System.out.println("最终通知");

}

@AfterThrowing("anyMethod()")

public void doAfterThrow(){

System.out.println("例外通知");

}

@Around("anyMethod()")

public Object doBasicProfiling(ProceedingJoinPoint pjp)
throws Throwable{
System.out.println("进入环绕通知");

Object object = pjp.proceed();//执行该方法

System.out.println("退出方法");

return object;
}
}

package com.bird.service;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

/**
* 切面
* @author Bird
*
*/
@Aspect
public class MyInterceptor {
@Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")
private void anyMethod(){}//定义一个切入点

@Before("anyMethod() && args(name)")
public void doAccessCheck(String name){
System.out.println(name);
System.out.println("前置通知");
}

@AfterReturning("anyMethod()")
public void doAfter(){
System.out.println("后置通知");
}

@After("anyMethod()")
public void after(){
System.out.println("最终通知");
}

@AfterThrowing("anyMethod()")
public void doAfterThrow(){
System.out.println("例外通知");
}

@Around("anyMethod()")
public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable{
System.out.println("进入环绕通知");
Object object = pjp.proceed();//执行该方法
System.out.println("退出方法");
return object;
}
}

[java]
view plaincopyprint?

@Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")

[java]
view plaincopyprint?

@Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")

@Pointcut("execution(* com.bird.service.impl.PersonServiceBean.*(..))")

这句话是方法切入点，execution为执行的意思，*代表任意返回值，然后是包名，.*意思是包下面的所有子包。(..)代

表各种方法.

然后下面的注解就比较简单了，就是在使用方法前和中，还有环绕拦截/

然后在Spring的配置文件中继续配置Bean,需要打开AOP命名空间

[java]
view plaincopyprint?

<?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-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
<aop:aspectj-autoproxy/>
<bean id="personServiceBean"
class="com.bird.service.impl.PersonServiceBean"/>

<bean id="myInterceptor"
class="com.bird.service.MyInterceptor"/>

</beans>

[java]
view plaincopyprint?

<?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-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
<aop:aspectj-autoproxy/>
<bean id="personServiceBean"
class="com.bird.service.impl.PersonServiceBean"/>

<bean id="myInterceptor"
class="com.bird.service.MyInterceptor"/>

</beans>

<?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-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">

<aop:aspectj-autoproxy/>
<bean id="personServiceBean" class="com.bird.service.impl.PersonServiceBean"/>
<bean id="myInterceptor" class="com.bird.service.MyInterceptor"/>

</beans>

然后建立一个Junit测试

[java]
view plaincopyprint?

package junit.test;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bird.service.PersonServer;

public class SpringAOPTest {

@Test

public void inteceptorTest(){

ApplicationContext ctx = new ClassPathXmlApplicationContext("beanAop.xml");

PersonServer bean = (PersonServer)ctx.getBean("personServiceBean");

bean.save(null);

}

}

[java]
view plaincopyprint?

package junit.test;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bird.service.PersonServer;

public class SpringAOPTest {

@Test
public void inteceptorTest(){

ApplicationContext ctx = new ClassPathXmlApplicationContext("beanAop.xml");

PersonServer bean = (PersonServer)ctx.getBean("personServiceBean");

bean.save(null);

}

}

package junit.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bird.service.PersonServer;

public class SpringAOPTest {

@Test
public void inteceptorTest(){
ApplicationContext ctx = new ClassPathXmlApplicationContext("beanAop.xml");
PersonServer bean = (PersonServer)ctx.getBean("personServiceBean");
bean.save(null);
}

}

测试结果为

[java]
view plaincopyprint?

2012-3-12
18:08:39 org.springframework.context.support.AbstractApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6: display name [org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6];
startup date [Mon Mar 12 18:08:39 CST
2012]; root of context hierarchy

2012-3-12
18:08:40 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [beanAop.xml]

2012-3-12
18:08:40 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory

信息: Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@dd20f6]: org.springframework.beans.factory.support.DefaultListableBeanFactory@b0bad7

2012-3-12
18:08:40 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons

信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@b0bad7: defining beans [org.springframework.aop.config.internalAutoProxyCreator,personServiceBean,myInterceptor];
root of factory hierarchy
null
前置通知
进入环绕通知
我是save方法
后置通知
退出方法
最终通知