Spring之AOP、execution和前置通知

一、创建LogBefore.java文件：

package org.ruangong.aop;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class LogBefore implements MethodBeforeAdvice{

	@Override
	public void before(Method method, Object[] args, Object target) throws Throwable {
		// TODO Auto-generated method stub
		System.out.println("前置通知...");
	}

}

　　二、配置applicationContext.xml文件：

<!-- 前置通知 -->
	<bean id="studentDao" class="org.ruangong.dao.impl.StudentDaoImpl"></bean>
	
	
	<bean id="studentService" class="org.ruangong.service.StudentServiceImpl">
		<property name="studentDao" ref="studentDao"></property>
	</bean>
	<!-- 通知类 -->
	<bean id="logBefore" class="org.ruangong.aop.LogBefore"></bean>
	<!-- 将addStudent()和通知进行关联 -->
	<aop:config>
	<!-- 配置切入点，在哪里执行通知 -->
		<aop:pointcut expression="execution(public void org.ruangong.service.StudentServiceImpl.addStudent(org.ruangong.entity.Student))" id="pointcut"/>
		<!-- 相当于连接切入点和切面的线 -->
		<aop:advisor advice-ref="logBefore" pointcut-ref="pointcut"/>
		<aop:aspect></aop:aspect>
	</aop:config>

　　三、进行测试：

public static void testAOP(){
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		IStudentService studentService= (IStudentService) context.getBean("studentService");
		Student student = new Student();
		student.setStuNo(123);
		student.setStuName("李明");
		student.setStuAge(36);
		studentService.addStudent(student);
	}

　　

 如果想要在两个方法之前都执行前置通知，只需要在xml文件中，

<aop:pointcut expression="execution(public void org.ruangong.service.StudentServiceImpl.deleteStudentByNo(int)) or execution(public void org.ruangong.service.StudentServiceImpl.addStudent(org.ruangong.entity.Student))" id="pointcut"/>

　　添加execution（）并用or连接。