Spring-aop-理论知识 Spring-Aop-注解实现 项目结构图
具体步骤:
1、创建maven 项目 导入依赖 创建好项目结构
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< dependencies >
< dependency >
< groupId >org.projectlombok</ groupId >
< artifactId >lombok</ artifactId >
< version >1.18.18</ version >
</ dependency >
< dependency >
< groupId >junit</ groupId >
< artifactId >junit</ artifactId >
< version >4.12</ version >
< scope >test</ scope >
</ dependency >
< dependency >
< groupId >org.springframework</ groupId >
< artifactId >spring-context</ artifactId >
< version >5.3.4</ version >
</ dependency >
< dependency >
< groupId >org.springframework</ groupId >
< artifactId >spring-beans</ artifactId >
< version >5.3.4</ version >
</ dependency >
< dependency >
< groupId >org.springframework</ groupId >
< artifactId >spring-core</ artifactId >
< version >5.3.4</ version >
</ dependency >
< dependency >
< groupId >org.springframework</ groupId >
< artifactId >spring-expression</ artifactId >
< version >5.3.4</ version >
</ dependency >
< dependency >
< groupId >org.springframework</ groupId >
< artifactId >spring-aop</ artifactId >
< version >5.3.4</ version >
</ dependency >
< dependency >
< groupId >org.aspectj</ groupId >
< artifactId >aspectjweaver</ artifactId >
< version >1.9.6</ version >
</ dependency >
</ dependencies >
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2、写一个接口 及 其实现类
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/**
* @version 1.0
* @author: crush
* @date: 2021-03-05 10:26
*/
public interface TestDao {
public void delete();
}
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/**
* @version 1.0
* @author: crush
* @date: 2021-03-05 10:27
*/
@Service
public class TestDaoImpl implements TestDao {
public void delete() {
System.out.println( "正在执行的方法-->删除" );
}
}
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3、切面类
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/**
* @version 1.0
* @author: crush
* @date: 2021-03-10 18:04
*/
@Aspect
@Component
public class MyAspectAnnotation {
@Pointcut ( "execution(* com.dao.*.*(..))" )
private void myPointCut(){
}
/**
* 前置通知 使用JoinPoint 接口作为参数获得目标对象的信息
* @Before("myPointCut()") ==
* <aop:after method="after" pointcut-ref="myPointCut"/>
**/
@Before ( "myPointCut()" )
public void before(JoinPoint jp){
System.out.print( "前置通知:模拟权限控制" );
System.out.println( "目标对象:" +jp.getTarget()+ ",被增强的方法:" +jp.getSignature().getName());
}
@AfterReturning ( "myPointCut()" )
public void afterReturning(JoinPoint jp){
System.out.print( "后置返回通知:" + "模拟删除临时文件" );
System.out.println( ",被增强的方法" +jp.getSignature().getName());
}
@Around ( "myPointCut()" )
public Object around(ProceedingJoinPoint pjp) throws Throwable {
System.out.println( "环绕开始:执行目标方法前,模拟开启事务" );
Object obj = pjp.proceed();
System.out.println( "环绕结束:执行目标方法后,模拟关闭事务" );
return obj;
}
@AfterThrowing (value = "myPointCut()" ,throwing = "throwable" )
public void except(Throwable throwable){
System.out.println( "异常通知:" + "程序执行异常" +throwable.getMessage());
}
@After ( "myPointCut()" )
public void after(){
System.out.println( "最终通知:释放资源" );
}
}
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4、application.xml 文件
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<? 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.xsd
http://www.springframework.org/schema/context
http://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.dao" />
< context:component-scan base-package = "com.aspect" />
<!--启动基于注解的AspectJ支持-->
< aop:aspectj-autoproxy proxy-target-class = "true" />
</ beans >
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测试
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@Test
public void Test(){
ApplicationContext applicationContext = new ClassPathXmlApplicationContext( "applicationContext.xml" );
TestDao testDao = applicationContext.getBean( "testDaoImpl" , TestDaoImpl. class );
testDao.delete();
/**
* 输出:
* 环绕开始:执行目标方法前,模拟开启事务
* 前置通知:模拟权限控制目标对象:com.dao.TestDaoImpl@2bef51f2,被增强的方法:delete
* 正在执行的方法-->删除
* 后置返回通知:模拟删除临时文件,被增强的方法delete
* 最终通知:释放资源
* 环绕结束:执行目标方法后,模拟关闭事务
*/
}
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总结
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原文链接:https://blog.csdn.net/weixin_45821811/article/details/118054678