Spring框架学习笔记2：AOP及其相关概念和使用示例

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package com.weishuzhai.target;
 
public interface UserDAO {
public void save();
 
public void findByEmail(String email);
}

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package com.weishuzhai.target;
 
public class JDBCUserDAOImpl implements UserDAO {
 
public void findByEmail(String email) {
System.out.println("采用JDBC技术保存用户信息");
 
}
 
public void save() {
System.out.println("采用JDBC技术查询用户信息");
 
}
}

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package com.weishuzhai.user;
 
import org.junit.Test;
 
import com.weishuzhai.target.UserDAO;
 
public class UserService {
public UserDAO userDao;
 
public void setUserDao(UserDAO userDao) {
this.userDao = userDao;
}
 
/**
* 注册业务方法
*
*/
public void regist() {
// System.out.println("-- 欢迎使用该功能 --");
System.out.println("数据保存成功！谢谢使用！");
userDao.save();
}
 
/**
* 登录业务方法
*
*/
public void login() {
System.out.println("登录成功，谢谢使用!");
userDao.findByEmail("Tom");
}
}

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package com.weishuzhai.aspect;
 
public class MyAspect {
public void myAspectBefore() {
System.out.println("-- 欢迎使用该功能 --");
}
 
public void myAspectAfter() {
System.out.println("-- 功能使用结束！谢谢使用 --");
}
}

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<aop:aspect />

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<aop:pointcut />

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<aop:before />

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< ?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-2.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd"
default-lazy-init="true">
<bean id="userDAO" class="com.weishuzhai.target.JDBCUserDAOImpl"/>
<bean id="userService" class="com.weishuzhai.user.UserService">
<property name="userDao" ref="userDAO"></property>
</bean>
<!-- AOP配置 -->
<bean id="myAspect" class="com.weishuzhai.aspect.MyAspect"/>
<aop:config>
<!-- 将myAspect Bean组件指定为切面组件 -->
<aop:aspect id="aspectEx" ref="myAspect">
<!-- 切入点,匹配UserService类中的所有方法 -->
<aop:pointcut id="servicePointcut" expression="execution(* com.weishuzhai.user.UserService.*(..))"></aop:pointcut>
<!-- 定义前置通知.指定切面组件中的myAspectbefore方法,在切入点之前调用 -->
<aop:before pointcut-ref="servicePointcut" method="myAspectBefore"></aop:before>
<!-- 定义最终通知,指定切面组件中的myAspectAfter方法,在切入点之后调用 -->
<aop:after pointcut-ref="servicePointcut" method="myAspectAfter"></aop:after>
</aop:aspect>
</aop:config>
</beans>

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package com.weishuzhai.test;
 
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
import com.weishuzhai.user.UserService;
 
public class TestUserService {
@Test
public void test() {
ApplicationContext ac = new ClassPathXmlApplicationContext(
"applicationContext.xml");
UserService service = (UserService) ac.getBean("userService");
service.regist();
service.login();
}
}

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<aop:before />

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<aop:after -returning/>

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<aop:after />

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<aop:around />

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<aop:after -throwing/>