（1）在idea中新建立一個maven專案aopAspectj，，編寫POM檔案，匯入jar包：

<dependencies>
    <!--aspectj依賴-->
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjrt</artifactId>
        <version>1.8.10</version>
    </dependency>

    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjtools</artifactId>
        <version>1.8.10</version>
    </dependency>

    <!--spring相關包-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>4.3.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.3.1.RELEASE</version>
    </dependency>

</dependencies>
 

public interface Performance {
    public void perform();
}

public class Theatre implements Performance{
    public void perform(){
        System.out.println("50個人正在表演舞臺劇");
    }
}

（4）使用註解@Aspect來定義切面。在表演之前的動作有silenceCellPhones和takeSeats

@Aspect //表明該類別是一個切面
public class Audience {

    @Pointcut("execution(** Performance.perform(..))")  //定義命令的切點
    public void performance(){}

    @Before("performance()")    //在表演之前
    public void silenceCellPhones(){
        System.out.println("Silencing cell phones");
    }

    @Before("performance()")    //在表演之前
    public void takeSeats(){
        System.out.println("Taking seats");
    }

    @AfterReturning("performance()")    //表演之後
    public void applause(){
        System.out.println("CLAP CLAP CLAP!!!");
    }

    @AfterThrowing("performance()")
    public void demandRefund(){    //表演失敗之後
        System.out.println("Demanding a refund");
    }
}
 

其中@Pointcut是用來定義performance()，使它可以代表含義"execution(** Performance.perform(..))"

（5）然後建立配置類ConcertConfig，用來把Aspectj自啟動代理。其中@EnableAspectJAutoProxy來啟動Aspectj代理。

@Configuration
@EnableAspectJAutoProxy //啟用Aspectj自動代理
public class ConcertConfig {

    @Bean   //聲明瞭一個切面bean
    public Audience audience(){
        return new Audience();
    }

    @Bean
    public Performance theatre(){
        return new Theatre();
    }
}

（6）測試主類PerformanceTest

ublic class PerformanceTest {
    public static void main(String[] args){
        //載入java配置類獲取Spring應用上下文
        ApplicationContext ac=new AnnotationConfigApplicationContext(ConcertConfig.class);
        //獲取播放器
        Performance pf=ac.getBean(Performance.class);
        //播放
        pf.perform();
    }
}

（7）結果顯示：