Spring 使用 AspectJ 进行 AOP 的开发
1）引入相关的jar包
- spring 的传统 AOP 的开发的包：
spring-aop-4.2.4.RELEASE.jar
com.springsource.org.aopalliance-1.0.0.jar - aspectJ 的开发包:
com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar
spring-aspects-4.2.4.RELEASE.jar
2）引入Spring的配置文件
引入 AOP 约束: <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"> </beans>
3）编写目标类
public class ProductDao { public void save() { System.out.println("保存商品..."); } public void update() { System.out.println("修改商品..."); } public void delete() { System.out.println("删除商品..."); } public void find() { System.out.println("查询商品..."); } }
4）配置目标类
<bean id="productDao" class="cn.itcast.spring.demo4.ProductDao"></bean>
5）开启aop注解的自动代理
<aop:aspectj-autoproxy/>
6）AspectJ的AOP的注解
@Aspect:定义切面类的注解
通知类型:
- @Before :前置通知
- @AfterReturing :后置通知
- @Around :环绕通知
- @After :最终通知
- @AfterThrowing :异常抛出通知.
- @Pointcut:定义切入点的注解
7）编写切面类
@Aspect public class MyAspectAnno { @Before("MyAspectAnno.pointcut1()") public void before() { System.out.println("前置通知==========="); } @Pointcut("execution(* cn.itcast.spring.demo4.ProductDao.save(..))") private void pointcut1() { } }
8）配置切面
<!-- 配置切面类 --> <bean id="myAspectAnno" class="cn.itcast.spring.demo4.MyAspectAnno"></bean>
9）其它通知的注解
@Aspect public class MyAspectAnno { @Before("MyAspectAnno.pointcut1()") public void before() { System.out.println("前置通知==========="); } @AfterReturning("MyAspectAnno.pointcut2()") public void afterReturning() { System.out.println("后置通知==========="); } @Around("MyAspectAnno.pointcut3()") public Object around(ProceedingJoinPoint joinPoint) throws Throwable { System.out.println("环绕前通知=========="); Object obj = joinPoint.proceed(); System.out.println("环绕后通知=========="); return obj; } @AfterThrowing("MyAspectAnno.pointcut4()") public void afterThrowing() { System.out.println("异常抛出通知========"); } @After("MyAspectAnno.pointcut4()") public void after() { System.out.println("最终通知=========="); } @Pointcut("execution(* cn.itcast.spring.demo4.ProductDao.save(..))") private void pointcut1() { } @Pointcut("execution(* cn.itcast.spring.demo4.ProductDao.update(..))") private void pointcut2() { } @Pointcut("execution(* cn.itcast.spring.demo4.ProductDao.delete(..))") private void pointcut3() { } @Pointcut("execution(* cn.itcast.spring.demo4.ProductDao.find(..))") private void pointcut4() { } }
