Spring注解实现AOP
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要进行AOP编程,首先我们要在spring的配置文件中引入aop命名空间:
<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-2.5.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
</beans>
Spring提供了两种切面声明方式,实际工作中我们可以选用其中一种:
基于XML配置方式声明切面。
基于注解方式声明切面
自定的切面:(注意我们的切面一定要交给Spring管理才行,也即在XML文件里配置)
package cn.gbx.example; import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.AfterThrowing; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; @Aspect public class MyIntercept { @Pointcut("execution (* cn.gbx.serviceimpl.PersonServiceImpl.*(..))") private void anyMethod() {} // 定义一个切入点 @Before("anyMethod() && args(name)") //利用arg来限定拥有一个参数, 参数的名字是String类型,然后得到该参数 public void doAccessCheck(String name) { System.out.println("Name = " + name); System.out.println("前置通知"); } @AfterReturning(pointcut = "anyMethod()", returning="name") //获得返回结果 public void doAfterReturning(String name) { System.out.println("返回Name = " + name); System.out.println("后置通知"); } @After("anyMethod()") public void doAfter() { System.out.println("最终通知"); } @AfterThrowing(pointcut = "anyMethod()", throwing="e") public void doAfterThrowing(Exception e) { System.out.println(e.getMessage()); System.out.println("例外通知"); } @Around("anyMethod()")//环绕通知 可以在环绕通知里面坐权限的限定 struts 的连接器就是 定义格式是固定的 public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable { System.out.println("进入方法"); Object value = pjp.proceed(); System.out.println("退出方法"); return value; } }
XML配置文件:
<?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" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <aop:aspectj-autoproxy/> <bean id="personService" class="cn.gbx.serviceimpl.PersonServiceImpl"></bean> <bean id="myIntercept" class="cn.gbx.example.MyIntercept"></bean> </beans>