詳解Spring 基于 Aspect 注解的增強(qiáng)實(shí)現(xiàn)

package com.advice;

/**
 * @author Duoduo
 * @version 1.0
 * @date 2017/4/25 23:41
 */
public class Performer {

  public void doPerform() {
    System.out.println("Performer do perform ....................... ");
  }
}

package com.advice;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;

/**
 * @author Duoduo
 * @version 1.0
 * @date 2017/4/25 23:42
 */

@Aspect//定義切面
public class Audience {

  //定義切點(diǎn)
  @Pointcut("execution(* com.advice.Performer.doPerform(..))")
  public void doPerform(){}

  @Before("doPerform()")
  public void takeSeas() {
    System.out.println("The audience is taking their seats.");
  }

  @Before("doPerform()")
  public void turnOffPhone() {
    System.out.println("The audience is turn off their cellphone.");
  }

  @AfterReturning("doPerform()")
  public void applaund() {
    System.out.println("CLAP CLAP CLAP CLAP ...");
  }

  @AfterThrowing("doPerform()")
  public void demandRefund() {
    System.out.println("Boo! we want our money back!");
  }

  @Around("doPerform()")
  public void watchPerfomance(ProceedingJoinPoint joinPoint) {

    try {
      Long start = System.currentTimeMillis();

      joinPoint.proceed();

      long end = System.currentTimeMillis();

      System.out.println("The performance took "+(end-start)+" milliseconds");

    } catch (Throwable throwable) {
      throwable.printStackTrace();
    }


  }
}

<!-- aop 增強(qiáng)自動(dòng)代理 -->
<aop:aspectj-autoproxy/>
<bean id="audience" class="com.advice.Audience"/>
<bean id="performer" class="com.advice.Performer"/>

@Test
  public void testDoPerform() throws Exception {
    ApplicationContext context = new ClassPathXmlApplicationContext("classpath:smart-context.xml");
    //代理為指向Interface的代理
    Performer performer = (Performer) context.getBean("performer");

    System.out.println("+++++++++++++++++++++++++++++++++");
    performer.doPerform();
  }

+++++++++++++++++++++++++++++++++
2017-04-26 20:51:16,980 DEBUG [main] (AbstractBeanFactory.java:251) - Returning cached instance of singleton bean 'audience'
The audience is taking their seats.
The audience is turn off their cellphone.
Performer do perform ....................... 
The performance took 91 milliseconds
CLAP CLAP CLAP CLAP ...