首先看个例子，如下
接口代码：
package com.lei.demo.aop.schema; public interface IHello { public void sayHello(); }
接口实现：
package com.lei.demo.aop.schema; public class HelloService implements IHello { public void sayHello() { System.out.println("-----Hello World!-----"); } }
接下来我们要实现AOP，即调用sayHello方法时切入通知。
定义一个切面支持类HelloAspect.java
package com.lei.demo.aop.schema; /* * 切面支持类 */ public class HelloAspect { //前置通知 public void beforeAdvice() { System.out.println("===========before advice"); } //后置最终通知 public void afterFinallyAdvice() { System.out.println("===========after finally advice"); } }
Xml配置：Spring-AOP-Schema.xml
<?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-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd"> <!-- 目标类 --> <bean id="helloService" class="com.lei.demo.aop.schema.HelloService" /> <bean id="helloAspect" class="com.lei.demo.aop.schema.HelloAspect" /> <!-- 配置切面 --> <!-- aop:advisor，是有顺序的，必须放在aop:pointcut之后 --> <aop:config> <aop:pointcut id="helloPointcut" expression="execution(* com.lei.demo.aop.schema..*.*(..))" /> <aop:aspect ref="helloAspect"> <!—以下使用了两种方法定义切入点 pointcut-ref和pointcut--> <aop:before pointcut-ref="helloPointcut" method="beforeAdvice" /> <aop:after pointcut="execution(* com.lei.demo.aop.schema..*.*(..))" method="afterFinallyAdvice" /> </aop:aspect> </aop:config> </beans>
以上配置中method="beforeAdvice"、method="afterFinallyAdvice"对应helloAspect中的方法
测试，App.java
package com.lei.demo.aop.schema; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class App { private static ApplicationContext ctx; public static void main(String[] args) { ctx = new ClassPathXmlApplicationContext("Spring-AOP-Schema.xml"); IHello helloService = ctx.getBean("helloService",IHello.class); helloService.sayHello(); } }
运行App.java，结果如下：
===========before advice
-----Hello World!-----
===========after finally advice
实现org.aopalliance.intercept.MethodInvocation接口，
HelloAroundAdvice.java如下：
package com.lei.demo.aop.schema; import java.lang.reflect.Method; import org.aopalliance.intercept.MethodInterceptor; import org.aopalliance.intercept.MethodInvocation; public class HelloAroundAdvice implements MethodInterceptor { public Object invoke(MethodInvocation arg0) throws Throwable { System.out.println("++++++before advice"); arg0.proceed(); System.out.println("++++++after advice"); return null; } }
Xml配置：Spring-AOP-Schema.xml
<?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-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd"> <!-- 目标类 --> <bean id="helloService" class="com.lei.demo.aop.schema.HelloService" /> <bean id="helloArroundAdvice" class="com.lei.demo.aop.schema.HelloAroundAdvice" /> <!-- 配置切面 --> <aop:config> <aop:pointcut id="helloPointcut" expression="execution(* com.lei.demo.aop.schema..*.*(..))" /> <aop:advisor advice-ref="helloArroundAdvice" pointcut-ref="helloPointcut"/> </aop:config> </beans>
仍然运行App.java，结果如下：
++++++before advice
-----Hello World!-----
++++++after advice
原文：http://www.cnblogs.com/flying607/p/7833700.html