Spring_demo5_AOP_Annotation

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本文介绍了一个基于 Spring 框架实现的 AOP（面向切面编程）示例，包括配置文件、用户管理接口及其实现、AOP 切面定义和服务层逻辑处理等内容。通过一个具体的例子展示了如何在 Spring 应用中引入 AOP 来增强业务逻辑。

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bean.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: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.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        ">
	<context:annotation-config />
	<context:component-scan base-package="com"/>
	<aop:aspectj-autoproxy />
	
</beans>

用户管理接口

package com.dao;

import com.model.User;

public interface UserDAO {
	public void save(User user);
}

用户管理接口实现

package com.dao.impl;

import org.springframework.stereotype.Component;

import com.dao.UserDAO;
import com.model.User;

@Component("userDao")
public class UserDaoImpl implements UserDAO{

	@Override
	public void save(User user) {
		System.out.println("Mysql: " + user.getUsername());
	}

}

切面AOP

package com.aop;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class AopTest {

	//@Before("execution(public void com.dao.impl.UserDaoImpl.save(com.model.User))")
	@Pointcut("execution(public * com.dao..*.*(..))")
	public void myMethod(){};
	
	//@Before("myMethod()")
	//@Before("execution(public void com.dao.impl.UserDaoImpl.save(com.model.User))")
	@Before("execution(public * com.service..*.add(..))")
	public void before(){
		System.out.println("AopTest success");
	}
	
}

逻辑处理Service

package com.service;

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;

import com.dao.UserDAO;
import com.model.User;

@Component("userService")
public class UserService {
	private UserDAO userDAO;  
	
	public void add(User user) {
		userDAO.save(user);
	}
	
	public UserDAO getUserDAO() {
		return userDAO;
	}
	
	/**
	 * @Resource 默认使用userDAO（前提只有一个bean）
	 * @Resource(name = "user2")
	 * @param userDAO
	 */
	/*@Resource*/
	@Resource(name = "userDao")
	public void setUserDAO(UserDAO userDAO) {
		this.userDAO = userDAO;
	}
}

AOP测试

package com.service;

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

import com.model.User;

/**
 * Dao主要做数据库的交互工作
 * Modle 是模型 存放你的实体类
 *Service 做相应的业务逻辑处理
 *Action是一个控制器
 * @author tao.zeng
 *
 */
public class UserServiceTest {
	@Test
	public void testAdd() throws Exception {
		ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
		
	UserService service = (UserService)ctx.getBean("userService");
		User u = new User();
		u.setUsername("syw");
		u.setPassword("syw");
		service.add(u);
	}

}