SpringAOP的XML版

IWorkDao

package com.lbl.dao;

public interface IWorkDao {
     void work();
}

WorkDaoImpl

/**
 * Created by 李柏霖
 * 2020/10/12 10:30
 */

package com.lbl.dao.Impl;

import com.lbl.dao.IWorkDao;

public class WorkDaoImpl implements IWorkDao {
    
    

    @Override
    public void work() {
    
    
        System.out.println("我爱加班");
    }

}

Advice

/**
 * Created by 李柏霖
 * 2020/10/12 10:32
 */

package com.lbl.aspect;


public class Advice {
    
    

    public void writeLog(){
    
    
        System.out.println("写入日志");
    }
}

applicationContext.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-3.0.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

<bean id="workDaoImpl" class="com.lbl.dao.Impl.WorkDaoImpl"></bean>
<bean id="advice" class="com.lbl.aspect.Advice"></bean>
    <aop:config>
        <aop:pointcut id="work" expression="execution(public void com.lbl.dao.Impl.WorkDaoImpl.work())"/>
        <aop:aspect ref="advice">
            <aop:after method="writeLog" pointcut-ref="work"></aop:after>
        </aop:aspect>
    </aop:config>
</beans>

DaoTest

/**
 * Created by 李柏霖
 * 2020/10/12 10:37
 */

package com.lbl.dao;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class DaoTest {
    
    

    @Autowired
    IWorkDao iworkDao;

    @Test
    public void work(){
    
    
        System.out.println(iworkDao);
        iworkDao.work();
    }
}

测试运行结果：

AOP切面编程-切面表达式

• （1）什么是切面表达式
  execution([修饰符] 返回值类型 包.类.方法(参数列表) );
• （2）切面表达式有什么用？
  符合表达式的方法，会被增强
  使用* 表过任意的内容
  使用… 可以表示包与子包下面的类
  使用…可以写在方法(…)表示任意参数

我这边在上面代码的基础上再加一个eat（）方法，然后用通配符的方法，同时配置这两个方法。

IWorkDao

package com.lbl.dao;

public interface IWorkDao {
    
    
     void work();
     void eat();
}

WorkDaoImpl

/**
 * Created by 李柏霖
 * 2020/10/12 10:30
 */

package com.lbl.dao.Impl;

import com.lbl.dao.IWorkDao;

public class WorkDaoImpl implements IWorkDao {
    
    

    @Override
    public void work() {
    
    
        System.out.println("我爱加班");
    }

    @Override
    public void eat() {
    
    
        System.out.println("吃饭");
    }

}

Advice方法同上不变。

applicationContext.xml

这里面用了通配符的方法，将任意返回值的，在com.lbl.dao包以及其子包下的所有方法，参数任意。都织入writeLog这个方法。

<?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-3.0.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

<bean id="workDaoImpl" class="com.lbl.dao.Impl.WorkDaoImpl"></bean>
<bean id="advice" class="com.lbl.aspect.Advice"></bean>
    <aop:config>
        <aop:pointcut id="work" expression="execution( * com.lbl.dao..*(..))"/>
        <aop:aspect ref="advice">
            <aop:after method="writeLog" pointcut-ref="work"></aop:after>
        </aop:aspect>
    </aop:config>
</beans>

运行结果：