本文使用Maven建立的專案
pom.xml 檔案內容

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion
 
>

    <groupId>com.dyh</groupId>
    <artifactId>TestDemo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <!-- spring5.0.4 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId
 
>spring-context</artifactId>
            <version>5.0.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.0.4.RELEASE</version
 
>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>4.3.9.RELEASE</version>
        </dependency>

        <!-- AspectJ -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.6.11</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.11</version>
        </dependency>
        <!-- cglib -->
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>2.1</version>
        </dependency>
    </dependencies>
</project>

下面會用到AspectJ的幾種通知註解的:

1. @Before: 前置通知, 在方法執行之前執行
2. @After: 後置通知, 在方法執行之後執行
3. @AfterRunning:返回通知, 在方法成功執行返回結果之後執行
4. @AfterThrowing: 異常通知, 在方法丟擲異常之後
5. @Around: 環繞通知,圍繞著方法執行

有2種方法實現aop功能，本文使用的是javaconfig配置類註解實現，另一種是基於xml配置檔案
介面類

package com.dyh.ioc.base;

public interface Weapon {

    public void attack();
}

實體類

package com.dyh.ioc.base;

import org.springframework.stereotype.Component;
@Component
public class Knifie implements Weapon {
    public void attack() {
        System.out.println("C");
    }
}

實現類

package com.dyh.ioc.base;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;

@Component
public class Knight {
    private String name;
    private Weapon weapon;

    public Knight() {

    }
    public Knight(String name,Weapon weapon){
        this.name = name;
        this.weapon = weapon;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Weapon getWeapon() {
        return weapon;
    }
    //自動注入
    @Autowired
    //用於指定注入Bean的名稱
    @Qualifier("knifie")
    public void setWeapon(Weapon weapon) {
        this.weapon = weapon;
    }

    public void fight(){
        System.out.println("start ......");
        System.out.println(name);
        weapon.attack();
    }
}

JavaConfig類

package com.dyh.ioc.base;

import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.stereotype.Component;


//即使用jdk預設代理模式，AspectJ代理模式是CGLIB代理模式
//如果目標物件實現了介面，預設情況下會採用JDK的動態代理實現AOP
//如果目標物件實現了介面，可以強制使用CGLIB實現AOP (此例子我們就是強制使用cglib實現aop)
//如果目標物件沒有實現了介面，必須採用CGLIB庫，spring會自動在JDK動態代理和CGLIB之間轉換

//用於定義配置類，可替換xml配置檔案
@Configuration
//開啟AspectJ 自動代理模式,如果不填proxyTargetClass=true，預設為false，
@EnableAspectJAutoProxy(proxyTargetClass=true)
//掃描注入類
@ComponentScan(basePackages = "com.dyh.ioc.*")
@Component
@Aspect
public class AopAspectConfiguration {
    //宣告切入點
    //第一個*表示 方法  返回值（例如public int）
    //第二個* 表示方法的全限定名（即包名+類名）
    //perform表示目標方法引數括號兩個.表示任意型別引數
    //方法表示式以“*”號開始，表明了我們不關心方法返回值的型別。然後，我們指定了全限定類名和方法名。對於方法引數列表，
    //我們使用兩個點號（..）表明切點要選擇任意的perform()方法，無論該方法的入參是什麼
    //execution表示執行的時候觸發
    @Pointcut("execution(* *(..))")
    public void point(){
        //該方法就是一個標識方法，為pointcut提供一個依附的地方
    }

    @Before("point()")
    public void before(){
        System.out.println("Before");
    }
    @After("point()")
    public void after(){
        System.out.println("After");
    }
}

測試類

package com.dyh.ioc.base;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Test {
    public static void main(String[] args){
        AnnotationConfigApplicationContext  applicationContext = new AnnotationConfigApplicationContext(AopAspectConfiguration.class);
        Knight knight = applicationContext.getBean("knight",Knight.class);
        knight.setName("123");
        knight.fight();
    }
}

最終執行結果

E:\java\jdk1.8.0_162\bin\java -javaagent:E:\IDEA\lib\idea_rt.jar=65304:E:\IDEA\bin -Dfile.encoding=UTF-8 -classpath E:\java\jdk1.8.0_162\jre\lib\charsets.jar;E:\java\jdk1.8.0_162\jre\lib\deploy.jar;E:\java\jdk1.8.0_162\jre\lib\ext\access-bridge-64.jar;E:\java\jdk1.8.0_162\jre\lib\ext\cldrdata.jar;E:\java\jdk1.8.0_162\jre\lib\ext\dnsns.jar;E:\java\jdk1.8.0_162\jre\lib\ext\jaccess.jar;E:\java\jdk1.8.0_162\jre\lib\ext\jfxrt.jar;E:\java\jdk1.8.0_162\jre\lib\ext\localedata.jar;E:\java\jdk1.8.0_162\jre\lib\ext\nashorn.jar;E:\java\jdk1.8.0_162\jre\lib\ext\sunec.jar;E:\java\jdk1.8.0_162\jre\lib\ext\sunjce_provider.jar;E:\java\jdk1.8.0_162\jre\lib\ext\sunmscapi.jar;E:\java\jdk1.8.0_162\jre\lib\ext\sunpkcs11.jar;E:\java\jdk1.8.0_162\jre\lib\ext\zipfs.jar;E:\java\jdk1.8.0_162\jre\lib\javaws.jar;E:\java\jdk1.8.0_162\jre\lib\jce.jar;E:\java\jdk1.8.0_162\jre\lib\jfr.jar;E:\java\jdk1.8.0_162\jre\lib\jfxswt.jar;E:\java\jdk1.8.0_162\jre\lib\jsse.jar;E:\java\jdk1.8.0_162\jre\lib\management-agent.jar;E:\java\jdk1.8.0_162\jre\lib\plugin.jar;E:\java\jdk1.8.0_162\jre\lib\resources.jar;E:\java\jdk1.8.0_162\jre\lib\rt.jar;E:\WorkSpaces\TestDemo\target\classes;E:\apache-maven-3.5.2\repo\org\springframework\spring-context\5.0.4.RELEASE\spring-context-5.0.4.RELEASE.jar;E:\apache-maven-3.5.2\repo\org\springframework\spring-beans\5.0.4.RELEASE\spring-beans-5.0.4.RELEASE.jar;E:\apache-maven-3.5.2\repo\org\springframework\spring-expression\5.0.4.RELEASE\spring-expression-5.0.4.RELEASE.jar;E:\apache-maven-3.5.2\repo\org\springframework\spring-core\5.0.4.RELEASE\spring-core-5.0.4.RELEASE.jar;E:\apache-maven-3.5.2\repo\org\springframework\spring-jcl\5.0.4.RELEASE\spring-jcl-5.0.4.RELEASE.jar;E:\apache-maven-3.5.2\repo\org\springframework\spring-aop\4.3.9.RELEASE\spring-aop-4.3.9.RELEASE.jar;E:\apache-maven-3.5.2\repo\org\aspectj\aspectjrt\1.6.11\aspectjrt-1.6.11.jar;E:\apache-maven-3.5.2\repo\org\aspectj\aspectjweaver\1.6.11\aspectjweaver-1.6.11.jar;E:\apache-maven-3.5.2\repo\cglib\cglib\2.1\cglib-2.1.jar;E:\apache-maven-3.5.2\repo\asm\asm\1.5.3\asm-1.5.3.jar;E:\apache-maven-3.5.2\repo\asm\asm-util\1.3.4\asm-util-1.3.4.jar;E:\apache-maven-3.5.2\repo\aspectwerkz\aspectwerkz-core\0.8.1\aspectwerkz-core-0.8.1.jar com.dyh.ioc.base.Test
二月 27, 2018 5:36:19 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
資訊: Refreshing org.spring[email protected]1ed6993a: startup date [Tue Feb 27 17:36:19 CST 2018]; root of context hierarchy
Before
After
Before
After
Before
start ......
123
Before
C
After
After

Process finished with exit code 0

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