【Spring】简单的Spring AOP注解示例

引入相关包：

<properties>
    <spring.version>3.0.5.RELEASE</spring.version>
    <aspectj.version>1.6.11</aspectj.version>
</properties>

<dependencies>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjrt</artifactId>
        <version>${aspectj.version}</version>
    </dependency>

    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>${aspectj.version}</version>
    </dependency>

    <dependency>
        <groupId>cglib</groupId>
        <artifactId>cglib</artifactId>
        <version>3.1</version>
    </dependency>

</dependencies>

在Spring配置文件开启注解、AspectJ支持、扫描基础包：

<?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">
           
    <!-- 开启注解 -->
    <context:annotation-config/>
    <!-- AspectJ支持 -->
    <aop:aspectj-autoproxy />
    <!-- 扫描基础包 -->
    <context:component-scan base-package="com.nicchagil.springaop" />
    
</beans>

写两个测试的Service：

package com.nicchagil.springaop;

import org.springframework.stereotype.Service;

@Service
public class UserService {
    
    public void query(Integer id) {
        System.out.println("UserService.query()...");
    }

}

package com.nicchagil.springaop;

import org.springframework.stereotype.Service;

@Service
public class FunctionService {
    
    public void query() {
        System.out.println("FunctionService.query()...");
    }

}

切面的信息：

package com.nicchagil.springaop;

import java.util.Arrays;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
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 MyAOP {
    
    @Pointcut("execution(* com.nicchagil.springaop.*Service.query(..))")
    public void myPointcut() {
    }
    
    @Before("myPointcut()")
    public void myBefore(JoinPoint joinPoint) {
        Object[] args = joinPoint.getArgs(); // 入参
        System.out.println("Before. Args : " + Arrays.toString(args));
    }
    
    @AfterReturning("myPointcut()")
    public void myAfterReturning() {
        System.out.println("AfterReturning.");
    }
    
    @AfterThrowing("myPointcut()")
    public void myAfterThrowing() {
        System.out.println("AfterThrowing.");
    }

}

入口类：

package com.nicchagil.springaop;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class HowToUse {
    
    public static void main(String[] args) {
        ApplicationContext context =
                new ClassPathXmlApplicationContext("spring.xml");
        
        UserService us = context.getBean("userService", UserService.class);
        us.query(100);
        
        FunctionService fs = context.getBean("functionService", FunctionService.class);
        fs.query();
    }

}

日志：

Before. Args : [100]
UserService.query()...
AfterReturning.
Before. Args : []
FunctionService.query()...
AfterReturning.