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>


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