• 需要一個Aspect 的類，在類上添加註解 @Aspect

package com.john.aspect;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.JoinPoint.StaticPart;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

import com.john.service.LimintConfigService;

@Component
@Aspect
public class LoggerAspect {

    @Pointcut(value ="execution(* com.john.service.LimintConfigService.*(..))")
    public void pointCut() {

    }

    @Before(value = "pointCut()")
    public void beforeAdvice() {
        System.out.println("before advice...");    
    }

    @After(value = "pointCut()")
    public void afterAdvice() {
        System.out.println("after advice...");
    }

    @AfterReturning(value = "pointCut()")
    public void returningAdvice() {
        System.out.println("returning advice...");
    }

    @AfterThrowing(value = "pointCut()")
    public void throwAdvice() {
        System.out.println("throw advice...");
    }

    @Around(value = "pointCut()")
    public void aroundAdvice() {
        System.out.println("around advice...");
    }
}
 

• 業務邏輯類，在呼叫業務方法before()時，LoggerAspect 相應的通知，會切入到before()中，執行通知

@Service
public class LimintConfigService {

    public void before() {
        System.out.println("before()");
    }
}

• 主配置類，簡化了，這裡主要測試 AOP 功能，所有簡化了很多，一定要開啟 aspect 功能，在配置類上面加註解 @EnableAspectJAutoProxy

@Configuration
@EnableAspectJAutoProxy
@ComponentScan(basePackages = {"com.john"})
public class MainConfig {

}
 

• 測試

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(MainConfig.class);
        
        LimintConfigService service = context.getBean(LimintConfigService.class);
        service.after();     
          
        context.close();
    }
 

• 執行結果，測試時，本人_遮蔽了 aroundAdvice()_ 通知
  
  接下來，將詳細講解