spring的面向切面实现的两种方式

面向切面：主要应用在日志记录方面。实现业务与日志记录分离开发。

spring面向切面有两种实现方式：1、注解 2、xml配置。

1、注解实现如下:

（1）配置如下：

<?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"
xmlns:context="http://www.springframework.org/schema/context"
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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd ">
<context:annotation-config/>
<aop:aspectj-autoproxy/>  
<bean id="Psv" class="com.test.spring.AOP.Personservice"/>
<bean id="testAop" class="com.test.spring.AOP.testAop"/>
</beans>

注意：红色部分的配置

（2）切入实现的代码如下：

@Aspect
public class testAop {

//指明所要代理的类或方法
@Pointcut("execution(* com.test.spring.AOP.Personservice.*(..))")
public void pointCut(){}

@After("pointCut()")
public void after(){
System.out.println("after");
}

@Before("pointCut()")
public void before(){
//JoinPoint joinPoint
System.out.println("before");
}

@Around("pointCut()")
public Object around(ProceedingJoinPoint joinpoint){
//joinpoint.getArgs()能够得到传入到方法的参数
Object valu = null
try {
System.out.println("aaaaaaaa");
valu = joinpoint.proceed();
//返回所代理的方法（有返回值的方法）返回值
System.out.println(valu);

} catch (Throwable e) {
e.printStackTrace();
}
return valu;
}

@AfterReturning("pointCut()")
public void afteReturning(){
System.out.println("afteReturning");
}

@AfterThrowing("pointCut()")
public void afterThrowing(){
System.out.println("afterThrowing");
}
}

2、xml配置实现方式

<?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"
xmlns:context="http://www.springframework.org/schema/context"
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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd ">
<context:annotation-config/>

<bean id="Psv" class="com.test.spring.AOP.Personservice"/>
<bean id="testAop" class="com.test.spring.AOP.testAop"/>
<aop:config>
<aop:aspect id="Pservice" ref="testAop">
<!-- 配置指定切入的对象 -->
<aop:pointcut id="point_cut" expression="execution(* execution(* frame.com.Action.login.*(..)))" />
<!-- 只匹配add方法作为切入点
<aop:pointcut id="except_add" expression="execution(* com.test.spring.AOP.*.addPerson(..))" />
-->
<!-- 前置通知 -->
<aop:before method="before" pointcut-ref="point_cut" />
<!-- 后置通知 returning指定返回参数 -->
<aop:after-returning method="after" pointcut-ref="point_cut" returning="result" />
<!-- 环绕通知 -->

　　　　　　　　<aop:around method="around" pointcut-ref="point_cut"/>
<aop:after-throwing method="doThrow" pointcut-ref="point_cut" throwing="e"/>
</aop:aspect>
</aop:config>
</beans>