【学习笔记】spring AOP切面编程(注解)

（1）spring注解配置
配置文件开启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.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd">
       
	<aop:aspectj-autoproxy/>//自动代理

注解
切面@Aspect+四个注解 @Before @AfterReturning @AfterThrowing@After
切面@Aspect+@Arround

注解中的值为切点(需要增强类的方法)
示例:

@Component
@Aspect
public class Advice {
    public void writeLog(){
        System.out.println("写一个开发备忘录");
    }
    //try{  }
    @Before("execution( * com.wzx.service..*.*(..))")
    public void before(){
        System.out.println("before-------");
    }
    @AfterReturning("execution( * com.wzx.service..*.*(..))")
    public void afterReturn(){
        System.out.println("afterReturn-------");
    }
   //catch(exception e){ }
    @AfterThrowing("execution( * com.wzx.service..*.*(..))")
    public void afterThrow(){
        System.out.println("afterThrow-------");
    }
    //finally
    @After("execution( * com.wzx.service..*.*(..))")
    public void after(){
        System.out.println("after-------");
    }
    ------------------------------------------------------------------------
	around配置等于上面的配置
    @Around("execution( * com.wzx.service..*.*(..))")
    public void arround(ProceedingJoinPoint point ){//参目标类中的任意方法
        try{
            //执行before
            before();
            System.out.println("arround-------");
            point.proceed();
            //执行正常返回
            afterReturn();
        }catch (Throwable e){
            //补救方法
            afterThrow();
        }finally {
            //释放资源的方法
            after();
        }
    }
}