BeforeAdvice
1、会在目标对象的方法执行之前被调用。
2、通过实现MethodBeforeAdvice接口来实现。
3、该接口中定义了一个方法即before方法,before方法会在目标对象target之前执行。
AfterAdvice
1、在目标对象的方法执行之后被调用
2、通过实现AfterReturningAdvice接口实现
实现目标:
在方法之前调用执行某个动作。
IHello 和Hello:
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public interface IHello {
public void sayHello(String str);
}
public class Hello implements IHello {
@Override
public void sayHello(String str) {
System.out.println( "你好" +str);
}
}
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SayBeforeAdvice:
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public class SayBeforeAdvice implements MethodBeforeAdvice {
@Override
public void before(Method arg0, Object[] arg1, Object arg2) throws Throwable {
// TODO Auto-generated method stub
System.out.println( "在方法执行前做事情!" );
}
}
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SayAfterAdvice文件:
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public class SayAfterAdvice implements AfterReturningAdvice {
@Override
public void afterReturning(Object arg0, Method arg1, Object[] arg2, Object arg3) throws Throwable {
// TODO Auto-generated method stub
System.out.println( "在方法执行后做事情!" );
}
}
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applicationContext.xml:
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<?xml version= "1.0" encoding= "UTF-8" ?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
"http://www.springframework.org/dtd/spring-beans-2.0.dtd" >
<beans>
<!-- 建立目标对象实例 -->
<bean id= "bean_hello" class = "com.pb.Hello" />
<!-- 创建执行前advice实例 -->
<bean id= "sba" class = "com.pb.SayBeforeAdvice" />
<!-- 创建执行后advice实例 -->
<bean id= "sfa" class = "com.pb.SayAfterAdvice" />
<!-- 建立代理对象 -->
<bean id= "helloProxy" class = "org.springframework.aop.framework.ProxyFactoryBean" >
<!-- 设置代理的接口 -->
<property name= "proxyInterfaces" >
<value>com.pb.IHello</value>
</property>
<!-- 设置目标对象实例 -->
<property name= "target" >
<ref bean= "bean_hello" />
</property>
<!-- 设置Advice实例 -->
<property name= "interceptorNames" >
<list>
<value>sba</value>
<value>sfa</value>
</list>
</property>
</bean>
</beans>
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Main执行:
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public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext context= new ClassPathXmlApplicationContext( "applicationContext.xml" );
IHello hello=(IHello)context.getBean( "helloProxy" );
hello.sayHello( "访客" );
}
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执行效果:
