SpringAop简单实践(基于注解，基于配置类)

1.1 Maven引入包

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>spring_aop_test20210303</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <!-- spring版本号 -->
        <spring.version>5.2.4.RELEASE</spring.version>
        <!-- junit版本号 -->
        <junit.version>4.13.2</junit.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.7</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

 

 

1.2 生成目标类

 

package com.aop.anno.impl;

import com.aop.anno.Target;
import org.springframework.stereotype.Component;

@Component("target")
public class TargetImpl implements Target {
    public void save() {
        System.out.println("save...");
    }
}

 

 

1.3 生成切面类（下面用到的切点表达式请关注这篇：https://www.cnblogs.com/year12/p/14469495.html）

package com.aop.anno.impl;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;

@Component("myAspectImpl")
@Aspect //标记切面类
public class MyAspectImpl {

    @Pointcut(value = "execution(* com.aop.anno..*.*(..))")
    private void myPointcut()
    {}

    @Around("execution(* com.aop.anno..*.*(..))")
    public Object around(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("环绕前");
        Object proceed = pjp.proceed();
        System.out.println("环绕后");
        return proceed;
    }

    @Before(value="myPointcut()")
    public void before() {
        System.out.println("before");
    }

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

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

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

 

1.4 新建SpringConfiguration.java 配置类 （可替代application.xml）

package com.aop.config;

import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@Configurable   //标记这是一个配置类
@ComponentScan("com.aop.anno")  //自动扫描注入
@EnableAspectJAutoProxy //开启aop动态代理功能
public class SpringConfiguration {
}

1.5  编写测试类

package com.test.anno;

import com.aop.anno.Target;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;

@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration(classes = SpringConfiguration.class)

public class JunitTextAnno { @Resource private Target target; @Test public void test() { target.save(); } }