1,註解
1.1,通知類型
- @Before – 前置通知
- @AfterReturing – 後置通知
- @Around – 環繞通知(目標對象方法默認不執行的,需要手動執行)
- @After – 最終通知
- @AfterThrowing – 異常拋出通知
1.2,配置通用的切入點
使用@Pointcut定義通用的切入點
@Aspect
public class MyAspectAnno {
@Before(value="MyAspectAnno.fn()")
public void log(){
System.out.println("記錄日誌...");
}
@Pointcut(value="execution(public void com.itheima.demo1.CustomerDaoImpl.save())")
public void fn(){}
}
2,註解方式完成AOP的開發
2.1,導入依賴和約束
2.2,創建包結構,編寫具體的接口和實現類
- package:com.itheima.demo2
- Interface:CustomerDao
- Impl:CustomerDaoImpl
2.3, 目標類配置到Spring中
<bean id="customerDao" class="com.itheima.demo3.CustomerDaoImpl"/>
2.4,定義切面類
@Aspect
public class MyAspectAnno {
@Before("MyAspectAnno.pointcut1()")
public void before(){
System.out.println("前置通知===========");
}
@Pointcut("execution(* cn.itcast.spring.demo4.ProductDao.save(..))")
private void pointcut1(){}
}
2.5,開啓aop註解的自動代理
<aop:aspectj-autoproxy/>
2.6,在配置文件中完成aop的配置
<bean id="myAspectAnno" class="cn.itcast.spring.demo4.MyAspectAnno"></bean>
2.7,其他註解
public class MyAspectAnno {
@Before("MyAspectAnno.pointcut1()")
public void before(){
System.out.println("前置通知===========");
}
@AfterReturning("MyAspectAnno.pointcut2()")
public void afterReturning(){
System.out.println("後置通知===========");
}
@Around("MyAspectAnno.pointcut3()")
public Object around(ProceedingJoinPoint joinPoint) throws Throwable{
System.out.println("環繞前通知==========");
Object obj = joinPoint.proceed();
System.out.println("環繞後通知==========");
return obj;
}
@AfterThrowing("MyAspectAnno.pointcut4()")
public void afterThrowing(){
System.out.println("異常拋出通知========");
}
@After("MyAspectAnno.pointcut4()")
public void after(){
System.out.println("最終通知==========");
}
@Pointcut("execution(* cn.itcast.spring.demo4.ProductDao.save(..))")
private void pointcut1(){}
@Pointcut("execution(* cn.itcast.spring.demo4.ProductDao.update(..))")
private void pointcut2(){}
@Pointcut("execution(* cn.itcast.spring.demo4.ProductDao.delete(..))")
private void pointcut3(){}
@Pointcut("execution(* cn.itcast.spring.demo4.ProductDao.find(..))")
private void pointcut4(){}
}