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:
2. 在src/main/resources目录下新建spring-aop.xml文件:
3. MyAspect切面类:
4. Graceful目标类:
5. BeforeAdviceTest测试类:
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。
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.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd" default-autowire="byName"> <bean id="aspect" class="com.john.spring.aop.MyAspect" /> <bean id="grace" class="com.john.spring.aop.Graceful" /> <aop:config proxy-target-class="true"> <aop:aspect ref="aspect"> <aop:before pointcut="execution(* com.john..Graceful.analogous())" 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 { @Test public 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。