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 > |
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" ); } } |
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" ); }
} |
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 > |
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 */ } |
总结
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原文链接：https://blog.csdn.net/weixin_45821811/article/details/118054678