Spring--基於AspectJ的AOP開發
阿新 • • 發佈:2018-09-02
例如 dot junit4 dba demo1 out 前置 aspect point
AspectJ簡介
- ·AspectJ是一個基於Java語言的AOP框架
- ·Spring2.0以後新增了對AspectJ切點表達式支持
- ·@AspectJ是AspectJ1.5新增功能,通過JDK5註解技術,允許直接在Bean類中定義切面
- ·新版本Spring框架,建議使用AspectJ方式來開發AOP
- ·使用AspectJ需要導入Spring AOP和 Aspect/相關jar包
- -spring-aop-4.2.4.RELEASE.jar
- -com.springsource.org.aopalliance-1.0.0.jar
- -spring-aspects-4.2.4.RELEASE.jar
- -com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar
基於AspectJ的註解AOP開發
註解開發:環境準備
<?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" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here--> <!--開啟AspectJ的註解開發,自動代理=====================--> <aop:aspectj-autoproxy/> </beans>
@AspectJ提供不同的通知類型
- ·@Before 前置通知,相當於BeforeAdvice
- ·@AfterReturning 後置通知,相當於AfterReturningAdvice
- ·@Around 環繞通知,相當於MethodInterceptor
- ·@AfterThrowing異常拋出通知,相當於ThrowAdvice
- ·@After最終final通知,不管是否異常,該通知都會執行
- ·@DeclareParents 引介通知,相當於IntroductionInterceptor(不要求掌握)
在通知中通過value屬性定義切點
- ·通過execution函數,可以定義切點的方法切入
- ·語法:
- -execution(<訪問修飾符>?<返回類型><方法名>(<參數>)<異常>)
- ·例如
- -匹配所有類public方法 execution(public**(.))
- -匹配指定包下所有類方法 execution(*com.imooc.dao.*(..))不包含子包
- -execution(*com.imooc.dao..*(..))..*表示包、子孫包下所有類
- -匹配指定類所有方法 execution(*com.imooc.service.UserService.*(..))
- -匹配實現特定接口所有類方法
- execution(*com.imooc.dao.GenericDAO+.*(..))
- -匹配所有save開頭的方法 execution(*save*(..))
案例(前置通知)
MyAspectAnno
@Aspect public class MyAspectAnno { @Before(value = "execution(* com.windbag.aspectJ.demo1.ProductDao.save(..))") public void before(){ System.out.println("前置通知====================="); } }
ProductDao
public class ProductDao { public void save(){ System.out.println("保存商品"); } public void update(){ System.out.println("更改商品"); } public void findone(){ System.out.println("查詢一個商品"); } public void delete(){ System.out.println("刪除商品"); } public void findAll(){ System.out.println("查詢所有商品"); } }
SpringDemo1Test
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext.xml") public class SpringDemo1Test { @Resource(name="productDao") private ProductDao productDao; @Test public void demo1(){ productDao.delete(); productDao.findAll(); productDao.findone(); productDao.save(); productDao.update(); } }
applicationContext.xml
<?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" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here --> <!--開啟AspectJ的註解開發,自動代理=====================--> <aop:aspectj-autoproxy/> <!--目標類==============================================--> <bean id="productDao" class="com.windbag.aspectJ.demo1.ProductDao"/> <!--定義切面--> <bean class="com.windbag.aspectJ.demo1.MyAspectAnno"/> </beans>
其余的通知類型
@Aspect public class MyAspectAnno { @Before(value = "myPointcut1()") public void before(){ System.out.println("前置通知=================="); } @AfterReturning(value = "execution(* com.windbag.aspectJ.demo1.ProductDao.update(..))",returning = "result") public void afterReturing(Object result){ System.out.println("後置通知==================" + result); } @Around(value = "execution(* com.windbag.aspectJ.demo1.ProductDao.delete(..))") public Object around(ProceedingJoinPoint joinPoint) throws Throwable { System.out.println("環繞前通知================"); /*執行目標方法*/ Object obj = joinPoint.proceed(); System.out.println("環繞後通知================"); return obj; } @AfterThrowing(value = "execution(* com.windbag.aspectJ.demo1.ProductDao.findone(..))",throwing = "e") public void afterThrowing(Throwable e){ System.out.println("異常拋出通知=============" + e.getMessage()); } @After(value = "execution(* com.windbag.aspectJ.demo1.ProductDao.findAll(..))") public void after(){ System.out.println("最終通知================"); } @Pointcut(value = "execution(* com.windbag.aspectJ.demo1.ProductDao.save(..))") private void myPointcut1(){ } }
基於AspectJ的XML方式的AOP開發
案例
CustomerDao
public interface CustomerDao { public void save(); public String update(); public void delete(); public void findOne(); public void findAll(); }
CustomerImpl
public class CustomerDaoImpl implements CustomerDao { @Override public void save() { System.out.println("保存客戶"); } @Override public String update() { System.out.println("修改客戶"); return "hello"; } @Override public void delete() { System.out.println("刪除客戶"); } @Override public void findOne() { System.out.println("查詢一個客戶"); //int a = 1/0; } @Override public void findAll() { System.out.println("查詢多個客戶"); } }
SpringDemo2Test
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext2.xml") public class SpringDemo2Test { @Resource(name="customerDao") private CustomerDao customerDao; @Test public void demo1(){ customerDao.save(); customerDao.delete(); customerDao.findAll(); customerDao.findOne(); customerDao.update(); } }
MyAspectXml
public class MyAspectXml { //前置通知 public void before(JoinPoint joinPoint){ System.out.println("XML方式的前置通知" + joinPoint); } //後置通知 public void afterReturing(Object result){ System.out.println("XML方式的後置通知" + result); } //環繞通知 public Object around(ProceedingJoinPoint joinPoint) throws Throwable{ System.out.println("XML方式的環繞前通知"); Object obj = joinPoint.proceed(); System.out.println("XML方式的環繞後通知"); return obj; } //異常拋出通知 public void afterThrowing(Throwable e){ System.out.println("XML方式的異常拋出通知" + e.getMessage()); } //最終通知 public void after(){ System.out.println("XML方式的最終通知"); } }
applicationContext2.xml
<?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" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here --> <!--XML的配置方式完成AOP的開發--> <!--配置目標類================--> <bean id="customerDao" class="com.windbag.aspectJ.demo2.CustomerDaoImpl"/> <!--配置切面類--> <bean id="myAspectXml" class="com.windbag.aspectJ.demo2.MyAspectXml"/> <!--aop的相關配置============--> <aop:config> <!--配置切入點--> <aop:pointcut id="pointcut1" expression="execution(* com.windbag.aspectJ.demo2.CustomerDao.save(..))"/> <aop:pointcut id="pointcut2" expression="execution(* com.windbag.aspectJ.demo2.CustomerDao.update(..))"/> <aop:pointcut id="pointcut3" expression="execution(* com.windbag.aspectJ.demo2.CustomerDao.delete(..))"/> <aop:pointcut id="pointcut4" expression="execution(* com.windbag.aspectJ.demo2.CustomerDao.findOne(..))"/> <aop:pointcut id="pointcut5" expression="execution(* com.windbag.aspectJ.demo2.CustomerDao.findAll(..))"/> <!--配置AOP的切面--> <aop:aspect ref="myAspectXml"> <!--配置前置增強--> <aop:before method="before" pointcut-ref="pointcut1"/> <!--配置後置增強--> <aop:after-returning method="afterReturing" pointcut-ref="pointcut2" returning="result"/> <!--配置環繞增強--> <aop:around method="around" pointcut-ref="pointcut3"/> <!--配置異常拋出--> <aop:after-throwing method="afterThrowing" pointcut-ref="pointcut4" throwing="e"/> <!--配置增強--> <aop:after method="after" pointcut-ref="pointcut5"/> </aop:aspect> </aop:config> </beans>
項目源碼
https://github.com/ryanxu47/spring_aspect
Spring--基於AspectJ的AOP開發