spring aop的简单使用方法详解

package com.opk.bean;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;

import java.util.Arrays;

/* 
 * @Aspect： 告诉Spring当前类是一个切面类
 * wmy 13:03 2019/9/5
 * @Param 
 * @return 
 **/
@Aspect
public class LogAspects {

  //抽取公共的切入点表达式
  //1、本类引用
  //2、其他的切面引用
  @Pointcut("execution(public * com.opk.bean.*.*(..))")
  public void pointCut(){};

  //@Before在目标方法之前切入；切入点表达式（指定在哪个方法切入）
  @Before("pointCut()")
  public void logStart(JoinPoint joinPoint){
    Object[] args = joinPoint.getArgs();
    System.out.println(joinPoint.getSignature().getName()+":运行。。。@Before，参数列表是："+ Arrays.asList(args));
  }
  @After("com.opk.bean.LogAspects.pointCut()")
  public void logEnd(JoinPoint joinPoint){
    System.out.println(""+joinPoint.getSignature().getName()+"结束。。。@After");
  }

  //JoinPoint一定要出现在参数的第一位
  @AfterReturning(value ="pointCut()",returning = "result")
  public void logReturn(JoinPoint joinPoint,Object result){
    System.out.println(""+joinPoint.getSignature().getName()+"正常返回。。。@AfterReturning:运行结果：{"+result+"}");
  }

  @AfterThrowing(value ="pointCut()",throwing = "ex")
  public void logException(JoinPoint joinPoint,Exception ex){
    System.out.println(""+joinPoint.getSignature().getName()+"异常。。。异常信息：{"+ex+"}");
  }
}

import org.springframework.stereotype.Component;

@Component
public class MathCalculator {
  public int dev(int i,int j)
  {
    System.out.println("MathCalculator......");
    return i/j;
  }
}

@EnableAspectJAutoProxy
@Configuration
public class AOPConfig {

  //业务逻辑类加入容器中
  @Bean("calculator")
  public MathCalculator calculator(){
    return new MathCalculator();
  }

  //切面类加入到容器中
  @Bean
  public LogAspects logAspects(){
    return new LogAspects();
  }
}

public static void main(String[] args) {
    AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
    ctx.register(AOPConfig.class);
    ctx.refresh();
    MathCalculator bean = (MathCalculator)ctx.getBean("calculator");
    bean.dev(10,3);

  }