可以在方法加入 joinPoint 获取切点信息
切面：
@Aspect
public class AopAspectJ
{
// 前置通知：方法执行之前获得增强
@Before(value = "savePoint()")
public void beforAop(JoinPoint joinPoint)
{
System.out.println("this is before aop and joinPoint : " + joinPoint);
}
// 后置通知：可以获取方法返回值，result的名字可以任意取名，但是需要和方法对应
@AfterReturning(value = "execution(* com.imooc.service.TestService.update())", returning = "result")
public void afterReturningAop(Object result)
{
System.out.println("This is after retruning aop and result :" + result);
}
// 环绕通知：如果不调用joinPoint.proceed();则目标方法不会执行
@Around(value = "execution(* com.imooc.service.TestService.delete(..))")
public Object aroundAop(ProceedingJoinPoint joinPoint) throws Throwable
{
System.out.println("This is around aop --- before");
Object proceed = joinPoint.proceed();
System.out.println("This is around aop --- after");
return proceed;
}
// 异常抛出通知：可以获取异常属性
@AfterThrowing(value = "execution(* com.imooc.service.TestService.wrong(..))", throwing = "e")
public void throwAop(Exception e)
{
System.out.println("this is throw Aop and e : " + e);
}
// 最终通知：总是会被执行(即使发生异常)，相当于fianally
@After(value = "execution(* com.imooc.service.TestService.*(..))")
public void afterAop()
{
System.out.println("This is after aop ,the last advice");
}
// 切点：public void 无参方法，方法名为切点 使用@Pointcut进行定义。若存在多个切点，可以使用 || 分隔
@Pointcut(value = "execution(* com.imooc.service.TestService.save(..)) || execution(* com.imooc.service.TestService.update())")
private void savePoint()
{
}
}
切点：
public class TestServiceImpl implements TestService
{
@Override
public void save()
{
System.out.println("This is save method");
}
}
测试类：
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class DemoTest
{
@Resource
private TestService testService;
@Test
public void demo()
{
testService.save();
getPrintln();
testService.update();
getPrintln();
testService.delete();
getPrintln();
testService.wrong();
}
private void getPrintln()
{
System.out.println("---------------------");
}
}
// 切面写完了之后需要到xml对bean进行定义
<?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: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/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<aop:aspectj-autoproxy/>
<context:component-scan base-package="com.imooc"/>
<!--切面需要申明-->
<bean class="com.imooc.aop.AopAspectJ"/>
</beans>
下面给出XML的配置方法：
使用xml后，切面类不需要注解
<context:component-scan base-package="com.imooc.xmlaspectj"/>
<bean id="AopAspectJWithXml" class="com.imooc.xmlaspectj.aopwithxml.AopAspectJWithXml"/>
<!--xml配置-->
<aop:config>
<!--切点-->
<aop:pointcut id="TestWithXmlService"
expression="execution(* com.imooc.xmlaspectj.servicewithxml.TestWithXmlService.save())"/>
<!--切面-->
<aop:aspect ref="AopAspectJWithXml">
<aop:before method="beforAop" pointcut-ref="TestWithXmlService"/>
<aop:after-returning method="afterReturningAop" pointcut-ref="TestWithXmlService" returning="result"/>
</aop:aspect>
</aop:config>
poml.xml
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!--引入Spring的基本开发包-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.9</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
</dependencies>