使用註解的方式配置AOP

1、開啓註解模式

<aop:aspectj-autoproxy></aop:aspectj-autoproxy>

2、註解切面

       在通知的方法上面加上一個註解@Aspect

@Component("myAdvice")
/*切面*/

@Aspect
public class MyAdvice {

3、通知上面加上切點

五種：

@Before(表達式)  @After(表達式)  @AfterReturning(表達式) @Around(表達式)  @AfterThrowing(表達式)

4、書寫表達式的兩種方式

       (1).直接寫

@Before("execution(*cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")

@AfterReturning("execution(*cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")

@Around("execution(*cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")

@After("execution(*cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")

@AfterThrowing("execution(*cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")

       (2).配置一個切點，調用類的方法獲得切點

@Pointcut("execution(*cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")

public void pc(){

}

@Before("MyAdvice.pc()")

@AfterReturning("MyAdvice.pc()")

……

具體代碼奉上：

MyAdvice:

package cn.hd.springProxyAnnotation;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
@Component("myAdvice")
/*切面*/
@Aspect
public class MyAdvice {
    @Pointcut("execution(* cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")
    public void pc(){

    }

    /*@Before("execution(* cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")*/
    @Before("MyAdvice.pc()")
    public void before(){
        System.out.println("在目標方法前調用。");
    }

    /*@AfterReturning("execution(* cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")*/
    @AfterReturning("MyAdvice.pc()")
    public void afterReturning(){
        System.out.println("如果目標對象方法沒有出現異常，就會在該方法調用後調用。");
}

    @Around("execution(* cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")
    public Object around(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("環繞前在目標方法前都調用。");
        Object proceed = pjp.proceed();
        System.out.println("環繞後在目標方法後都調用。");
        return proceed;

    }

    @After("execution(* cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")
    public void after(){
        System.out.println("目標方法前後，不管有沒有異常都調用。");
    }

    @AfterThrowing("execution(* cn.hd.springProxyAnnotation.impl..*ServiceImpl.*(..))")
    public void throwException(){
        System.out.println("目標方法出現異常調用該方法。");
    }

Demo測試類:

package cn.hd.springProxyAnnotation;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:cn/hd/springProxyAnnotation/applicationContext.xml")
public class Demo {
    /*對應配置bean類的名字*/
    @Resource(name = "userService")
    private UserService userService;
    @Test
    public void fun1(){
        userService.add();
    }
}

UserServiceImpl:

package cn.hd.springProxyAnnotation.impl;


import cn.hd.springProxyAnnotation.UserService;
import org.springframework.stereotype.Service;

@Service("userService")
public class UserServiceImpl implements UserService {
    @Override
    public void add() {
//        System.out.println("開啓事務");
        System.out.println("添加用戶");
//        System.out.println("提交用戶");
    }

    @Override
    public void delete() {
//        System.out.println("開啓事務");
        System.out.println("刪除用戶");
//        System.out.println("提交事務");
    }

    @Override
    public void update() {
//        System.out.println("開啓事務");
        System.out.println("更新用戶");
//        System.out.println("提交事務");
    }

    @Override
    public void find() {
//        System.out.println("開啓事務");
        System.out.println("查詢用戶");
//        System.out.println("提交事務");
    }
}

applicationContext.xml文件：

<?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.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.xsd">

    <!--開啓註解方式-->
    <context:component-scan base-package="cn.hd.springProxyAnnotation"></context:component-scan>

    <!--開啓註解模式-->
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
</beans>