通知类型
在基于Spring AOP编程的过程中,基于AspectJ框架标准,spring中定义了五种类型的通知,它们分别是:
- 前置通知 (@Before)
- 返回通知 (@AfterReturning)
- 异常通知 (@AfterThrowing)
- 后置通知 (@After)
- 环绕通知 (@Around) :(优先级最高)
通知执行顺序
将上面的所有通知类型写入同一个切面中,它的执行顺序为:
测试代码
```java package com.cy.pj.common.aspect;
import org.aspectj.lang.JoinPoint; import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.AfterThrowing; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.springframework.stereotype.Component;
@Aspect @Component public class SysTimeAspect {
@Pointcut("bean(sysMenuServiceImpl)")
public void doTime(){}
@Before("doTime()")
public void doBefore(JoinPoint jp){
System.out.println("time doBefore()");
}
@After("doTime()")
public void doAfter(){//类似于finally{}代码块
System.out.println("time doAfter()");
}
@AfterReturning("doTime()")
public void doAfterReturning(){
System.out.println("time doAfterReturning");
}
@AfterThrowing("doTime()")
public void doAfterThrowing(){
System.out.println("time doAfterThrowing");
}
@Around("doTime()")
public Object doAround(ProceedingJoinPoint jp)
throws Throwable{
System.out.println("doAround.before");
try {
Object obj=jp.proceed();
return obj;
}catch(Throwable e) {
System.out.println("doAround.error-->"+e.getMessage());
throw e;
}finally {
System.out.println("doAround.after");
}
}