19、spring AOP+AspectJ

2019-11-08 01:04:12

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19、sPRing AOP+aspectJ

本文主要介绍AspectJ注解和spring AOP的结合

AspectJ主要有以下五种方式：

@Before——方法运行前执行@After——方法运行后执行@AfterReturning——方法返回value后执行@AfterThrowing——抛出异常后执行@Around——环绕型，结合前面四种

说明：spring中并没有继承Aspect的jar包需要导入两个jar包：

aspectjwear.jaraspectjrt.jar

maven依赖如下：

<dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjrt</artifactId> <version>1.6.11</version> </dependency>  <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.5.4</version> </dependency>

例子

目录结构如下：这里写图片描述

第一步：添加类代码： HelloWorld.java

public interface HelloWorld { public void printHelloWorld(); public String printAndReturn(); public void throwException() throws Exception;}

HelloWorldImpl.java

public class HelloWorldImpl implements HelloWorld{ public void printHelloWorld() { System.out.println("printHelloWorld方法执行了"); } public String printAndReturn() { System.out.println("printAndReturn方法执行了"); return "你好啊"; } public void throwException() throws Exception{ System.out.println("throwException抛出异常了"); throw new Exception("Generic Error"); }}

AspectJService.java

@Aspectpublic class AspectJService { @Before("execution(* com.main.AOP.AspectJ.HelloWorld.printHelloWorld(..))") public void printBefore(){ System.out.println("AspectJService : before"); } @After("execution(* com.main.AOP.AspectJ.HelloWorld.printHelloWorld(..))") public void printAfter(){ System.out.println("AspectJService : after"); } @AfterReturning(pointcut = "execution(* com.main.AOP.AspectJ.HelloWorld.printAndReturn(..))", returning= "result") public void printAfterReturning(String result){ //获取返回值 System.out.println(result); System.out.println("AspectJService : AfterReturning"); } @AfterThrowing( pointcut = "execution(* com.main.AOP.AspectJ.HelloWorld.throwException(..))", throwing= "error") public void printAfterThrowing(Throwable error){ System.out.println("Exception : " + error); System.out.println("AspectJService : printAfterThrowing"); }}

第二步：配置Aspect

测试运行：

@Test public void test(){ applicationContext context = new ClassPathXmlApplicationContext("com/main/AOP/AspectJ/bean.xml"); HelloWorld helloworld = (HelloWorld)context.getBean("helloWorld"); helloworld.printHelloWorld(); System.out.println("----------------------------------"); helloworld.printAndReturn(); System.out.println("----------------------------------"); try { helloworld.throwException(); } catch (Exception e) { e.printStackTrace(); } }

结果：这里写图片描述

同样的，可以用xml的形式来配置修改你的bean.xml配置文件如下

<bean id="logAspect" class="com.main.AOP.AspectJ.AspectJService" /><aop:config> <aop:aspect id="aspectLoggging" ref="logAspect" >  <aop:pointcut id="pointCutBefore" expression="execution(* com.main.AOP.AspectJ.HelloWorld.printHelloWorld(..))" /> <aop:before method="printBefore" pointcut-ref="pointCutBefore" />   <aop:pointcut id="pointCutAfter" expression="execution(* com.main.AOP.AspectJ.HelloWorld.printHelloWorld(..))" /> <aop:after method="printAfter" pointcut-ref="pointCutAfter" />  `  <aop:pointcut id="pointCutAfterReturning" expression="execution(* com.main.AOP.AspectJ.HelloWorld.printAndReturn(..))" /> <aop:after-returning method="printAfterReturning" returning="result" pointcut-ref="pointCutAfterReturning" />   <aop:pointcut id="pointCutAfterThrowing" expression="execution(* com.main.AOP.AspectJ.HelloWorld.throwException(..))" /> <aop:after-throwing method="printAfterThrowing" throwing="error" pointcut-ref="pointCutAfterThrowing" /> </aop:aspect></aop:config>

这时你的@注解可以统统删掉了，测试方法一样不变

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