AOP 面向切面编程 入门练习

编写过程

添加依赖

<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/maven-v4_0_0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>com.urfread</groupId><artifactId>untitled1</artifactId><version>1.0-SNAPSHOT</version></parent><artifactId>LearnAOP</artifactId><name>Archetype - LearnAOP</name><url>http://maven.apache.org</url><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.2</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>6.1.5</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId><version>6.1.5</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aspects</artifactId><version>6.1.5</version></dependency></dependencies>
</project>

Spring配置文件

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsd">
<!--    开启组件扫描--><context:component-scan base-package="com.urfread.learnaop"/>
<!--    开启aspectj自动代理,为目标对象生成代理--><aop:aspectj-autoproxy/>
</beans>

接口类和实现类

package com.urfread.learnaop;public interface Calculator {int add(int a, int b);int sub(int a, int b);int mul(int a, int b);int div(int a, int b);
}

package com.urfread.learnaop;import org.springframework.stereotype.Component;@Component("calculator")
public class CalculatorImpl implements Calculator{@Overridepublic int add(int a, int b) {int result = a + b;System.out.println(a+" + "+b+" = "+result);return result;}@Overridepublic int sub(int a, int b) {int result = a - b;System.out.println(a+" - "+b+" = "+result);return result;}@Overridepublic int mul(int a, int b) {int result = a * b;System.out.println(a+" * "+b+" = "+result);return result;}@Overridepublic int div(int a, int b) {int result = a / b;System.out.println(a+" / "+b+" = "+result);return result;}
}

切面类

package com.urfread.learnaop;import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;@Aspect//切面类
@Component//ioc容器
public class LogAspect {//设置切入点和通知类型//切入点表达式：execution(访问修饰符 返回值类型 全类名.方法名(参数列表))//设置通知类型// 前置 @Before(value="切入点表达式配置切入点")@Before("execution(* com.urfread.learnaop.CalculatorImpl.*(..))")public void beforeMethod(){System.out.println("前置通知");}// 返回 @AfterReturning// 异常 @AfterThrowing// 后置 @After// 环绕 @Around}

测试类

import com.urfread.learnaop.Calculator;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class TestAop {@Testpublic void test(){ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");Calculator calculator = context.getBean("calculator", Calculator.class);calculator.add(1,2);}
}