aspectj通知

特點:能吧前置通知，後置通知，環繞通知，等都可以寫在一個類裏

步驟

maven導包

<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.8.9</version>
</dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.1.6.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>4.1.6.RELEASE</version>
    </dependency>

提供目標對象PhoneImpl.java

import org.springframework.stereotype.Component;

@Component
public class PhoneImpl {

    public void product5S() {
        System.out.println("生產iPhone 5S中");
    }
}

提供aspectj代理類AspectJProxy.java

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

@Aspect
//要把這個類放到IoC容器中
@Component
public class AspectJProxy {
    //使用通配符，*代表，忽略修飾符和返回值，*號還可以用在方法中，比如* product*(...)，也可以用在參數中
    @Before("execution(* product*(..))")
    public void before() {
        System.out.println("前置通知");
    }
    @After("execution(* product*(..))")
    public void after() {
        System.out.println("後置通知");
    }
}

配置applicationContext.xml

<?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:mvc="http://www.springframework.org/schema/mvc"
    xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
            http://www.springframework.org/schema/context 
            http://www.springframework.org/schema/context/spring-context-3.0.xsd
            http://www.springframework.org/schema/aop 
            http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
            http://www.springframework.org/schema/tx 
            http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
            http://www.springframework.org/schema/mvc 
            http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
            http://www.springframework.org/schema/context 
            http://www.springframework.org/schema/context/spring-context-3.0.xsd">
   <!-- 掃包 -->
   <context:component-scan base-package="com.henu.phone"></context:component-scan>

    <aop:aspectj-autoproxy proxy-target-class="true"></aop:aspectj-autoproxy>
</beans>

編寫測試類Test.java

import javax.annotation.Resource;

import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations="classpath:applicationContext.xml")
public class Test {
    @Resource 
    private PhoneImpl phone;
    @org.junit.Test
    public void handler() {
        phone.product5S();
    }
}

輸出結果

前置通知
生產iPhone 5S中
後置通