Detailed explanation of Spring's enhanced implementation examples based on Aspect-javaTutorial-php.cn

Detailed explanation of Spring's enhanced implementation examples based on Aspect

Y2J

Release： 2017-05-08 15:36:57

Original

1771 people have browsed it

This article mainly introduces the detailed explanation of Spring's enhanced implementation based on Aspect annotations. It is of great practical value. Friends who need it can refer to

to organize the documents and search out a code for Spring's enhanced implementation based on Aspect annotations. , slightly organized and streamlined for sharing

Define basic entity classes

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

Copy after login

Define enhanced classes based on annotations

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();
    }


  }
}

Copy after login

Spring automatic proxy configuration

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

Copy after login

Junit Test

@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();
  }

Copy after login

Test results

+++++++++++++++++++++++++++++++++
2017-04-26 20:51:16,980 DEBUG [main] (AbstractBeanFactory.java:251) - Returning cached instance of singleton bean &#39;audience&#39;
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 ...

Copy after login

[Related recommendations]

1. Java Free Video Tutorial

2. Alibaba Java Development Manual

3. Comprehensive analysis of Java annotations

The above is the detailed content of Detailed explanation of Spring's enhanced implementation examples based on Aspect. For more information, please follow other related articles on the PHP Chinese website!