1、Spring AOP的简单实例

一、Spring AOP的简单实例
1. 往pom.xml文件添加以下依赖：

<dependency>  <groupId>org.testng</groupId>  <artifactId>testng</artifactId>  <version>6.4</version>  <scope>test</scope></dependency><dependency>  <groupId>org.springframework</groupId>  <artifactId>spring-context</artifactId>  <version>3.1.2.RELEASE</version></dependency><dependency>  <groupId>cglib</groupId>  <artifactId>cglib</artifactId>  <version>2.2.2</version></dependency><dependency>  <groupId>org.aspectj</groupId>  <artifactId>aspectjweaver</artifactId>  <version>1.7.0</version></dependency>

2. 在src/main/resources目录下新建spring-aop.xml文件：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"? xmlns:aop="http://www.springframework.org/schema/aop"? xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"? default-autowire="byName">? <bean id="aspect" />??? <bean id="grace" />??? <aop:config proxy-target-method="beforeAdvice()" />? </aop:aspect>? </aop:config></beans>

3. MyAspect切面类：

public class MyAspect {    public void beforeAdvice() {        System.out.println("beforeAdvice() is executed!");    }}

4. Graceful目标类：

public class Graceful {    public void analogous() {        System.out.println("Analogous() is being executed");    }}

5. BeforeAdviceTest测试类：

public class BeforeAdviceTest {@Testpublic void test() {AbstractApplicationContext ctx = new ClassPathXmlApplicationContext("beans-aop.xml");Graceful graceful = ctx.getBean("grace", Graceful.class);graceful.analogous();}}

运行test()方法，输出：

beforeAdvice() is executed!
Analogous() is being executed


附：
①. <aop:config>需要添加proxy-target-class="true"属性，防止使用JDK代理导致在获取实例并转换为Graceful时报错。

②. 不管是目标类还是切面类，都要交由spring托管，并委托CGLIB改写目标类。

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