第二个Spring程序 AOP范例

1、新建maven工程

2、在pom.xml文件导入相关jar包

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-core --><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>5.2.1.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-beans --><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>5.2.1.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-context --><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.2.1.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api --><dependency><groupId>org.junit.jupiter</groupId><artifactId>junit-jupiter-api</artifactId><version>5.6.2</version><scope>test</scope></dependency><!-- https://mvnrepository.com/artifact/junit/junit --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>compile</scope></dependency><!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver --><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.9.6</version><scope>runtime</scope></dependency><!-- https://mvnrepository.com/artifact/org.aspectj/aspectjrt --><dependency><groupId>org.aspectj</groupId><artifactId>aspectjrt</artifactId><version>1.9.6</version></dependency>

3、在 Packge【service】下创建 【ProductService】类：

package service;public class ProductService {public void doSomeService(){System.out.println("doSomeService");}
}

4、在 xml 文件中装配该 bean：

<bean name="productService" class="service.ProductService" />

5、在【TestSpring】中编写测试代码，运行：

package test;import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import pojo.Source;
import service.ProductService;public class TestSpring {@Testpublic void test(){ApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"applicationContext.xml"});ProductService productService = (ProductService) context.getBean("productService");productService.doSomeService();}
}

运行结果

doSomeService

6、在 Packge【aspect】下准备日志切面 【LoggerAspect】类：

package aspect;import org.aspectj.lang.ProceedingJoinPoint;public class LoggerAspect {public Object log(ProceedingJoinPoint joinPoint) throws Throwable {System.out.println("start log:" + joinPoint.getSignature().getName());Object object = joinPoint.proceed();System.out.println("end log:" + joinPoint.getSignature().getName());return object;}
}

7、在 xml 文件中声明业务对象和日志切面：

<?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:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-3.0.xsdhttp://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx-3.0.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.0.xsd"><bean name="productService" class="service.ProductService" /><bean id="loggerAspect" class="aspect.LoggerAspect"/><!-- 配置AOP --><aop:config><!-- where：在哪些地方（包.类.方法）做增加 --><aop:pointcut id="loggerCutpoint"expression="execution(* service.ProductService.*(..)) "/><!-- what:做什么增强 --><aop:aspect id="logAspect" ref="loggerAspect"><!-- when:在什么时机（方法前/后/前后） --><aop:around pointcut-ref="loggerCutpoint" method="log"/></aop:aspect></aop:config>
</beans>

8、再次运行 TestSpring 中的测试代码，代码并没有改变，但是在业务方法运行之前和运行之后，都分别输出了日志信息：

start log:doSomeService
doSomeService
end log:doSomeService