Spring AOP面向切面编程基础

一、使用情形
如果需要在现有业务类的基础上进行日志收集、安全管理、事务管理、缓存优化等功能时，一般会使用Spring的AOP实现功能的增强。如下现有简单业务：

package com.giser.aop;

public interface Performance {
	void perform();
}

package com.giser.aoptest;

import org.springframework.stereotype.Service;

import com.giser.aop.Performance;

@Service
public class GISPerformance implements Performance {

	@Override
	public void perform() {
		System.out.println("gis performance");
	}

}

现在需要在perform之前或之后添加一些行为，如就座、鼓掌等，就需要使用切面。
二、使用方式
1、声明切面类

package com.giser.aop;

import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

/**
 * 将POJO Audience使用@Aspect进行标注，表明此类为切面类
 */
@Aspect
public class Audience {
	// 定义切点表达式
	@Pointcut("execution(** com.giser.aop.Performance.*(..))")
	public void pointcut() {}
	
//	@Before("execution(** com.giser.aop.Performance.*(..))")
	@Before("pointcut()") // 引用切点表达式
	public void silenceCellPhones() {
		System.out.println("Silencing cell phones");
	}
	
//	@Before("execution(** com.giser.aop.Performance.*(..))")
	@Before("pointcut()")
	public void takeSeats() {
		System.out.println("takeSeats");
	}
	
//	@AfterReturning("execution(** com.giser.aop.Performance.*(..))")
	@AfterReturning("pointcut()")
	public void applause() {
		System.out.println("applause");
	}
	
//	@AfterThrowing("execution(** com.giser.aop.Performance.*(..))")
	@AfterThrowing("pointcut()")
	public void demandRefund() {
		System.out.println("demandRefund");
	}
	
}

2、启用切面类
2.1 基于注解方式：

package com.giser.aop;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@Configuration
@EnableAspectJAutoProxy  // 启用AspectJ自动代理，使切面类生效
public class ConcertConfig {
	
	@Bean  // 声明切面类的bean
	public Audience audience() {
		return new Audience();
	}
	
}

测试：

package com.giser.aoptest;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.giser.aop.ConcertConfig;
import com.giser.aop.Performance;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes= {ConcertConfig.class, GISPerformance.class})
public class SpringTest {
	
	@Autowired
	private Performance performance;
	
	@Autowired
	private ConcertConfig concertConfig;
	
	@Test
	public void testPerformance() {
		performance.perform();
	}
	
}

输出：

Silencing cell phones
takeSeats
gis performance
applause

2.2 基于xml
spring.xml

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		http://www.springframework.org/schema/aop
		http://www.springframework.org/schema/aop/spring-aop.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-3.0.xsd">
	

	
	<context:component-scan base-package="com.giser" />

	
	<bean class="com.giser.aop.Audience" />
	
	
	<aop:aspectj-autoproxy />
	
beans>

测试：

package com.giser.aoptest;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.giser.aop.Performance;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(value = {"classpath:spring.xml"})
public class SpringTest2 {
	
	@Autowired
	private Performance performance;
	
	@Test
	public void testPerformance() {
		performance.perform();
	}
	
}

输出：

Silencing cell phones
takeSeats
gis performance
applause
applause

三、pom配置

	<properties>
		<maven.compiler.target>1.8maven.compiler.target>
		<maven.compiler.source>1.8maven.compiler.source>
		<java.version>1.8java.version>
		<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
		<spring.version>4.3.9.RELEASEspring.version>
	properties>
    <dependencies>
		
		<dependency>
			<groupId>org.springframeworkgroupId>
			<artifactId>spring-contextartifactId>
		dependency>
		<dependency>
			<groupId>org.springframeworkgroupId>
			<artifactId>spring-webartifactId>
		dependency>

		<dependency>
			<groupId>org.springframeworkgroupId>
			<artifactId>spring-coreartifactId>
		dependency>

		<dependency>
			<groupId>org.springframeworkgroupId>
			<artifactId>spring-testartifactId>
		dependency>
		
		
		<dependency>
			<groupId>org.aspectjgroupId>
			<artifactId>aspectjrtartifactId>
			<version>1.9.5version>
		dependency>

		
		<dependency>
			<groupId>org.aspectjgroupId>
			<artifactId>aspectjweaverartifactId>
			<version>1.9.5version>
		dependency>
dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-aopartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-aspectsartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-beansartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-contextartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-context-supportartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-coreartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-expressionartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-instrumentartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-instrument-tomcatartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-jdbcartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-jmsartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-messagingartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-ormartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-oxmartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-testartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-txartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-webartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-webmvcartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-webmvc-portletartifactId>
				<version>${spring.version}version>
			dependency>
			<dependency>
				<groupId>org.springframeworkgroupId>
				<artifactId>spring-websocketartifactId>
				<version>${spring.version}version>
			dependency>
		dependencies>
	dependencyManagement>