快速入门
1、基于注解的aop开发步骤:
2、创建目标接口和目标类(内部有切点)
3、创建切面类(内部有增强方法)
4、将目标类和切面类的对象创建权交给spring
5、在切面类中使用注解配置织入关系
6、在配置文件中开启组件扫描和AOP的自动代理
7、测试
入门代码实现
项目结构

pom.xml
<?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>com.itheima</groupId>
<artifactId>Spring_day03_03_AOP</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.4</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
</dependencies>
</project>
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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
https://www.springframework.org/schema/aop/spring-aop.xsd">
<context:component-scan base-package="com.itheima"/>
<aop:aspectj-autoproxy/>
</beans>
config类
SpringConfig.java
package com.itheima.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
@Configuration
@ComponentScan("com.itheima")
@EnableAspectJAutoProxy
public class SpringConfig {
}
aop类
AOPAdvice.java
package com.itheima.aop;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
@Component
@Aspect
@Order(2)
public class AOPAdvice {
@Before("AOPPointcut.pt1()")
public void aop002log(){
System.out.println("前置before...1");
}
}
AOPAdvice2.java
package com.itheima.aop;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
@Component
@Aspect
@Order(1)
public class AOPAdvice2 {
@Before("AOPPointcut.pt1()")
public void aop001exception(){
System.out.println("前置before...2");
}
}
AOPPointcut.java
package com.itheima.aop;
import org.aspectj.lang.annotation.Pointcut;
public class AOPPointcut {
@Pointcut("execution(* *..*(..))")
public void pt1(){}
}
service类
UserService.java
package com.itheima.service;
public interface UserService {
public int save(int i, int m);
}
UserServiceImpl.java
package com.itheima.service.impl;
import com.itheima.service.UserService;
import org.springframework.stereotype.Service;
@Service("userService")
public class UserServiceImpl implements UserService {
public int save(int i,int m){
System.out.println("user service running..."+i+","+m);
return 100;
}
}
APP.java
import com.itheima.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class App {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
UserService userService = (UserService) ctx.getBean("userService");
userService.save(666,888);
}
}
Junit.java
package com.itheima.service;
import com.itheima.config.SpringConfig;
import org.junit.Assert;
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(classes = SpringConfig.class)
public class UserServiceTest {
@Autowired
private UserService userService;
@Test
public void testSave(){
int ret = userService.save(888, 666);
Assert.assertEquals(100,ret);
}
}
注解配置AOP详解
关于通知的类型

关于切点表达式的抽取
同xml配置aop一样,我们可以将切点表达式抽取。抽取方式是在切面内定义方法,在该方法上使用@Pointcut注解定义切点表达式,然后在在增强注解中进行引用。具体如下:
