Spring AOP配置文件方式入门教程详解

<dependencies>
    <!-- Spring 核心容器 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.0.2.RELEASE</version>
    </dependency>

    <!-- 日志相关 -->
    <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
        <version>1.2</version>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.12</version>
    </dependency>

    <!-- 测试 -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>

    <!-- AOP 相关依赖 -->
    <dependency>
        <groupId>aopalliance</groupId>
        <artifactId>aopalliance</artifactId>
        <version>1.0</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
        <version>5.0.2.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.8.3</version>
    </dependency>
</dependencies>

package com.qcbyjy.demo2;

public interface UserService {
    void save();
}

package com.qcbyjy.demo2;

public class UserServiceImpl implements UserService {
    @Override
    public void save() {
        System.out.println("业务层：保存用户...");
    }
}

package com.qcbyjy.demo2;

/**
 * 自定义切面类 = 切入点(表达式) + 通知(增强代码)
 */
public class MyXmlAspect {

    // 通知逻辑：增强方法
    public void log() {
        System.out.println("增强的方法执行了...");
    }

    // 环绕通知示例
    public void aroundLog(org.aspectj.lang.ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("环绕前...");
        pjp.proceed(); // 手动执行目标方法
        System.out.println("环绕后...");
    }
}

<?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.xsd">

    <!-- 配置业务类 -->
    <bean id="userService" class="com.qcbyjy.demo2.UserServiceImpl"/>

    <!-- 配置切面类 -->
    <bean id="myXmlAspect" class="com.qcbyjy.demo2.MyXmlAspect"/>

    <!-- 配置 AOP 增强 -->
    <aop:config>
        <aop:aspect ref="myXmlAspect">

            <!-- 前置通知：目标方法执行前增强 -->
            <aop:before method="log"
                        pointcut="execution(* com.qcbyjy.demo2.UserServiceImpl.save(..))"/>
        </aop:aspect>
    </aop:config>

</beans>

package com.qcbyjy.test;

import com.qcbyjy.demo2.UserService;
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_demo2.xml")
public class Demo2 {

    @Autowired
    private UserService userService;

    @Test
    public void run1() {
        userService.save();
    }
}

execution([修饰符] 返回值类型 包名.类名.方法名(参数))

<aop:before method="log"
            pointcut="execution(* com.qcbyjy.*.*ServiceImpl.save*(..))"/>

<aop:around method="aroundLog"
            pointcut="execution(* com.qcbyjy.*.*ServiceImpl.save*(..))" />