關於Spring基於Aspect 的增強實作實例詳解

本篇文章主要介紹了詳解Spring 基於Aspect 註解的增強實現，非常具有實用價值，需要的朋友可以參考下

整理文檔，搜刮出一個Spring 基於Aspect 註解的增強實現的程式碼，稍微整理精簡一下做下分享

定義基本實體類別

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 ....................... ");
  }
}

定義基於註解的增強類別

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//定义切面
public class Audience {

  //定义切点
  @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();
    }


  }
}

Spring 自動代理程式設定

<!-- aop 增强自动代理 -->
<aop:aspectj-autoproxy/>
<bean id="audience" class="com.advice.Audience"/>
<bean id="performer" class="com.advice.Performer"/>

Junit測試

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

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

測試結果

+++++++++++++++++++++++++++++++++
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 ...

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