Java乔晓松基于注解的面向AOP(切面)编程

面向切面编程

自定义切面

package cn.csdn.service;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
/**
 * 切面
 *
 */
@Aspect
public class MyInterceptor {
	@Pointcut("execution (* cn.itcast.service.impl.PersonServiceBean.*(..))")
	private void anyMethod() {}//声明一个切入点
	
	@Before("anyMethod() && args(name)")
	public void doAccessCheck(String name) {
		System.out.println("前置通知:"+ name);
	}
	@AfterReturning(pointcut="anyMethod()",returning="result")
	public void doAfterReturning(String result) {
		System.out.println("后置通知:"+ result);
	}
	@After("anyMethod()")
	public void doAfter() {
		System.out.println("最终通知");
	}
	@AfterThrowing(pointcut="anyMethod()",throwing="e")
	public void doAfterThrowing(Exception e) {
		System.out.println("例外通知:"+ e);
	}
	
	@Around("anyMethod()")
	public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable {
		//if(){//判断用户是否在权限
		System.out.println("进入方法");
		Object result = pjp.proceed();
		System.out.println("退出方法");
		//}
		return result;
	}
	
}

 

Dao类：

package cn.csdn.service;

public interface PersonService {
	public void save(String name);
	public void update(String name, Integer id);
	public String getPersonName(Integer id);
}

DaoImpl类：

package cn.csdn.service.impl;

import cn.csdn.service.PersonService;

public class PersonServiceBean implements PersonService {

	public String getPersonName(Integer id) {
		System.out.println("我是getPersonName()方法");
		return "xxx";
	}

	public void save(String name) {
		throw new RuntimeException("我爱例外");
		//System.out.println("我是save()方法");
	}

	public void update(String name, Integer id) {
		System.out.println("我是update()方法");
	}

}

bean.xml配置文件：

<?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:context="http://www.springframework.org/schema/context" 
       xmlns:aop="http://www.springframework.org/schema/aop"      
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
        <aop:aspectj-autoproxy/> 
        <bean id="myInterceptor" class="cn.csdn.service.MyInterceptor"/>
        <bean id="personService" class="cn.csdn.service.impl.PersonServiceBean"></bean>
</beans>

 

测试类Test：

package junit.test;


import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.csdn.service.PersonService;

public class SpringAOPTest {

	@BeforeClass
	public static void setUpBeforeClass() throws Exception {
	}

	@Test public void interceptorTest(){
		ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml");
		PersonService personService = (PersonService)cxt.getBean("personService");
		personService.save("xx");
	}
}