Spring使用注解方式实现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.

1、实体bean

public class Person {

	private Long id;
	private String name;
	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}

 2、接口类

public interface PersonService {
	public void save(Person person);
	
	public void update(Person person); 
	
	public Person getByIdPerson(Long id);
	
	public void delete(Long id);
}

 3、实现类

public class PersonServiceImpl implements PersonService{

	Map<Long, Person> maps = new HashMap<Long, Person>();
	
	@Override  
    public void save(Person person) {
        System.out.println("***执行save方法***");
        maps.put(person.getId(), person);
    }  
  
    @Override  
    public void update(Person person) {  
        System.out.println("***执行update()方法***");
        maps.remove(person.getId());
        maps.put(person.getId(), person);
    }  
  
    @Override  
    public Person getByIdPerson(Long id) {  
        System.out.println("***执行getByIdPerson()方法***");  
        return maps.get(id);
    }  
    
    @Override
    public void delete(Long id) {
    	System.out.println("***执行delete()方法***");  
    	maps.remove(id);
    }
}

 4、使用Spring注解方式对这个Bean进行方法拦截

@Aspect  
public class MyInterceptor {

	@Pointcut("execution(* cn.tzz.aop.annotation.service.impl..*.*(..))")
	private void anyMethod(){}//定义切点  
	
	@Before("anyMethod() && args(person)")  
	public void doAccessCheck(Person person){  
		System.out.println(person.getName());  
		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("异常通知");  
	}  
	
	@Around("anyMethod()")  
	public Object doBasicProfiling(ProceedingJoinPoint proceedingJoinPoint) throws Throwable{  
		System.out.println("进入环绕通知");  
		Object object = proceedingJoinPoint.proceed();//执行该方法  
		System.out.println("退出方法");  
		return object;  
	}  
}  

 

@Pointcut("execution(* cn.tzz.aop.annotation.service.impl..*.*(..))")

上述是定义方法切入点，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.

5、在Spring的配置文件中配置Bean,需要打开AOP命名空间

<?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:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
	http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
	http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
	http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
	
    <context:annotation-config />
	<context:component-scan base-package="cn.tzz.aop.annotation" />
	
    <aop:aspectj-autoproxy proxy-target-class="true" />
	<bean id="personService" class="cn.tzz.aop.annotation.service.impl.PersonServiceImpl"></bean>
	<bean id="myInterceptor" class="cn.tzz.aop.annotation.MyInterceptor"></bean>
    
</beans>

 6、测试

public class TestAop {

	private static ApplicationContext ctx = null;
	private static PersonService personService = null;
	
	static{
	 ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
	 personService = (PersonService)ctx.getBean("personService");
	}
	
	public void testSave(){
		Person person = new Person();
		person.setId(1L);
		person.setName("abc");
		personService.save(person);
	}
	
	public void testGetByIdPerson(){
		Person p = personService.getByIdPerson(1L);
		System.out.println(p.getId()+"---"+p.getName());
	}
	
	public void testUpdate(){
		Person person = new Person();
		person.setId(1L);
		person.setName("abc_1");
		personService.update(person);
	}
	
	public void testDelete(){
		personService.delete(1L);
	}
	
	@Test  
    public void testInteceptor(){  
		testSave();
//		testGetByIdPerson();
//		testUpdate();
//		testGetByIdPerson();
//		testDelete();
//		testGetByIdPerson();
    }  
}

 7、测试结果

abc
前置通知
进入环绕通知
***执行save方法***
后置通知
退出方法
最终通知