1、編寫(xiě)目標(biāo)

public interface ICustomerService {public void save();public void search();public int update(); } @Service public class CustomerServiceImpl implements ICustomerService {@Overridepublic void save() {System.out.println("customerService save...");}@Overridepublic void search() {//System.out.println(10/0);System.out.println("customerService search...");}@Overridepublic int update() {System.out.println("customerService update...");return 10;}}

在Spring配置文件applicationContext.xml中配置掃描注解。必須在spring的配置文件中開(kāi)啟aspectJ注解自動(dòng)代理功能。

<?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.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"><context:component-scan base-package="cn.nwtxxb" /><!-- 開(kāi)啟aspectj注解自動(dòng)代理 --><aop:aspectj-autoproxy proxy-target-class="true"/> </beans>

2、編寫(xiě)增強(qiáng)（advice）使用@Aspect來(lái)聲明切面，使用@Before來(lái)聲明前置通知

//通知 @Component @Aspect // 聲明當(dāng)前的bean就是一個(gè)切面 public class CustomerServiceHelper {@Pointcut("execution(* *.s*(..))")private void mypointcut(){}@Pointcut("execution(* *.update(..))")private void mypointcut1(){}// 前置通知@Before("mypointcut()||mypointcut1()")public void before() {System.out.println("前置通知...");}// 后置通知@AfterReturning(value = "execution(* *.update(..))", returning = "value")public void afterReturning(JoinPoint jp, Object value) {System.out.println("后置通知,目標(biāo)方法的返回是" + value);}// 環(huán)繞通知@Around("mypointcut()")public Object around(ProceedingJoinPoint pjp) throws Throwable {System.out.println("環(huán)繞前...");Object value = pjp.proceed();System.out.println("環(huán)繞后");return value;}// 異常拋出通知@AfterThrowing(value = "mypointcut()", throwing = "ex")public void afterThrowing(JoinPoint jp, Throwable ex) {System.out.println("異常拋出通知:" + ex);}// 最終通知@After("mypointcut()")public void after() {System.out.println("最終通知");} }

4、測(cè)試

@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = "classpath:applicationContext.xml") public class AspectAnnotationTest {@Autowiredprivate ICustomerService customerService;@Testpublic void test1() {customerService.update();}}

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