马士兵Spring-AOP-XML配置（2）

一、

UserDAO.java:

package com.cy.dao;

import com.cy.model.User;

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

实现UserDAOImpl.java:

package com.cy.dao.impl;

import org.springframework.stereotype.Component;

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

@Component
public class UserDAOImpl implements UserDAO {

    public void save(User user) {
        //Hibernate
        //JDBC
        //XML
        //NetWork
        System.out.println("user saved!");
    }

}

切面类LogInterceptor.java:

package com.cy.aop;

public class LogInterceptor {

    public void before() {
        System.out.println("method before");
    }

}

UserService.java:

package com.cy.service;

import javax.annotation.Resource;

import org.springframework.stereotype.Component;

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

@Component("userService")
public class UserService {

    @Resource
    private UserDAO userDAO;  

    public void init() {
        System.out.println("init");
    }

    public void add(User user) {
        userDAO.save(user);
    }

    public UserDAO getUserDAO() {
        return userDAO;
    }

    public void setUserDAO( UserDAO userDAO) {
        this.userDAO = userDAO;
    }

    public void destroy() {
        System.out.println("destroy");
    }
}

配置文件beans.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-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">

    <context:annotation-config />
    <context:component-scan base-package="com.cy"/>

    <!-- 把切面类在容器中初始化
         这是一个切面逻辑类的对象
     -->
    <bean id="logInteceptor" class="com.cy.aop.LogInterceptor"></bean>

    <!--
        aop:config  aop配置
        aop:pointcut: 声明一个切面，在service的add方法上面加入我们切进来的各种逻辑；给这个切面起名为servicePointcut
                        在aop:config下面定义了一个全局的pointCut,可以在所有的aop:aspect上面使用；
                      （可以添加这种全局的pointCut，也可以在aop:aspect下面添加pointCut，后者只能在这个aspect下面使用）

        aop:aspect：   声明切面对象；它所参考的切面类的对象是logInteceptor
        aop:before:  在切面servicePointcut之前执行logInteceptor的before方法
     -->
    <aop:config>
        <aop:pointcut id="servicePointcut" expression="execution(public * com.cy.service..*.add(..))"/>
        <aop:aspect id="logAspect" ref="logInteceptor">
            <aop:before method="before" pointcut-ref="servicePointcut"/>
        </aop:aspect>
    </aop:config>

</beans>

测试代码：

UserServiceTest.java:

package com.cy.service;

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

import com.cy.model.User;

public class UserServiceTest {

    @Test
    public void testAdd() throws Exception {
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
        UserService service = (UserService)ctx.getBean("userService");
        System.out.println(service.getClass());
        service.add(new User());
        ctx.destroy();
    }
}

console:

二、第2个例子：

pointcut可以直接定义在aop:before/aop:after等这些advice里面：

beans.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-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">

    <context:annotation-config />
    <context:component-scan base-package="com.cy"/>

    <bean id="logInteceptor" class="com.cy.aop.LogInterceptor"></bean>
    <aop:config>
        <aop:aspect id="logAspect" ref="logInteceptor">
            <aop:before method="before" pointcut="execution(public * com.cy.service..*.add(..))"/>
        </aop:aspect>
    </aop:config>

</beans>

console同样的运行效果；

三、aop：advisor这个放在声明式事务管理中写；

总结：