SpringAOP

AOP概念

Code

/**
 * @author xixing
 * @version 1.0
 * @date 2020/9/11 10:21
 */
@Aspect
@Component
public class ServiceAspect {

   /**
    * *表示所有返回类型
    * ..表示该包下面的所有子包
    * *表示所有类
    * .*表示所有方法
    * (..)表示方法不管多少个参数
    *
    */
   @Pointcut("execution(* site.xixing.service..*.*(..))")
   public void embed(){

   }

   @Before("embed()")
   public void before(JoinPoint joinPoint){
      System.out.println("begin the joinPoint"+joinPoint);
   }

   @After("embed()")
   public void after(JoinPoint joinPoint){
      System.out.println("end the joinPoint"+joinPoint);
   }

   @Around("embed()")
   public Object around(JoinPoint joinPoint){
      long start=System.currentTimeMillis();
      System.out.println("开始计时:"+start);
      Object returnValue=null;

      try {
         ((ProceedingJoinPoint) joinPoint).proceed();

         System.out.println("执行成功");
      } catch (Throwable throwable) {
         throwable.printStackTrace();
      }finally {
         long endTime=System.currentTimeMillis();
         System.out.println("执行时间:"+(endTime-start));
      }
      return returnValue;
   }

   @AfterReturning(pointcut = "embed()" ,returning = "returnValue")
   public void afterReturning(JoinPoint joinPoint,Object returnValue){
      System.out.println("afterReturning:"+joinPoint+"最后返回:"+returnValue);
   }

   @AfterThrowing(pointcut = "embed()" ,throwing = "exception")
   public void afterThrowing(JoinPoint joinPoint,Exception exception){
      System.out.println("抛出异常通知:"+joinPoint+exception.getMessage());
   }

}

Introduction

@DeclareParents(value = "site.xixing.controller..*" ,defaultImpl =site.xixing.introduction.impl.LittleUniverseImpl.class)
public LittleUniverse littleUniverse;

代理模式

/**
 * @author xixing
 * @version 1.0
 * @date 2020/9/12 15:54
 */
public interface ToCPayment {

    void pay();
}

/**
 * @author xixing
 * @version 1.0
 * @date 2020/9/12 16:07
 */
public class ToCPaymentImpl implements ToCPayment {
    @Override
    public void pay() {
        System.out.println("支付！！！");
    }
}

/**
 * @author xixing
 * @version 1.0
 * @date 2020/9/12 16:08
 */
public class AlipayToC implements ToCPayment {

    ToCPayment toCPayment;

    public AlipayToC(ToCPayment toCPayment){
        this.toCPayment=toCPayment;
    }

    @Override
    public void pay() {
        before();
        toCPayment.pay();
        after();
    }

    private void before() {
        System.out.println("从银行取款！！！");
    }

    private void after() {
        System.out.println("转入对应的账户！！！");
    }
}

代理模式代码