Spring Aop执行时机及实现方式

实现一

首先我们先写两个切面类：执行时间执行顺序由@Order注解决定，参数越小，顺序越先

@Aspect
@Component
@Order(0)
public class MethodAspect {
 	@Before("execution(public int live.sunhao.calculator.service.CalculatorService.*(..))")
 	public void before(JoinPoint jp) {
  		Signature signature = jp.getSignature();
  		String name = signature.getName();
  		System.out.println("The "+ name +" method begins");
 	}
}

@Aspect
@Component
@Order(1)
public class ArgAspect {
 	@Before("execution(public int live.sunhao.calculator.service.CalculatorService.*(..))")
 	public void before(JoinPoint jp) {
  		Object [] args = jp.getArgs();
  		System.out.println("The"+ jp.getSignature().getName() +"method arg:["+args[0]+","+args[1]+"]");
 	}
}

然后配置xml文件,这里是采用自动代理的方式实现aop

<beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:context="http://www.springframework.org/schema/context"
 	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/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
  		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">
 	<context:component-scan base-package="live.sunhao">context:component-scan>
 	<aop:aspectj-autoproxy>aop:aspectj-autoproxy>
beans>

实现二

我们还可以手动实现aop

首先，我们把两个切面类中的所有注解去掉即可

接着，配置xml文件：

<beans xmlns="http://www.springframework.org/schema/beans"
  	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  	xmlns:context="http://www.springframework.org/schema/context"
  	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/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
    		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">
    		
  	<context:component-scan base-package="live.sunhao">context:component-scan>
 	<bean id="argAspect" class="live.sunhao.aspect.ArgAspect">bean>
 	<bean id="methodAspect" class="live.sunhao.aspect.MethodAspect">bean>
 	<aop:config>
  		<aop:pointcut expression="execution(public int live.sunhao.calculator.service.CalculatorService.*(..))" id="pointcut"/>
  		<aop:aspect ref="methodAspect" order="1">
   			<aop:before method="before" pointcut-ref="pointcut"/>
  		aop:aspect>
  		<aop:aspect ref="argAspect" order="2">
   			<aop:before method="before" pointcut-ref="pointcut"/>
  		aop:aspect>
 	aop:config>
beans>

最后我们写个测试类 测试功能即可