Spring AOP 样例

Spring AOP 样例  

2011-03-11 18:57:52|  分类：

Spring |  标签：spring  aop  样例  
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applicationContext.xml 文件

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"

"http://www.springframework.org/dtd/spring-beans-2.0.dtd">

<beans>

              <bean class="org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator" />

             <bean id="myAspect" class="com.demo.spring.aop.MyAspect" />

             <bean id="helloWorld" class="com.demo.spring.test.HelloWorld"/>

</beans>

声明一个切面类 ：

package com.demo.spring.aop;

import org.aspectj.lang.JoinPoint;
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 MyAspect {

       @Pointcut("execution(* execute(. .)) && target(com.demo.spring.test.HelloWorld)"
)   //切入点函数

        public void pointcut(){

        }

       @Before("pointcut()")  //前置通知 (Before Advice)

        public void beforeExecute(JoinPoint
thisJoinPoint){

                       System.out.println("连接点类型：" + thisJoinPoint.getKind());

                       System.out.println("代理类名："
+ thisJoinPoint.getSourceLocation().getClass().getName());

                       System.out.println("目标类名："
+ thisJoinPoint.getTarget().getClass().getName());

                       System.out.println("目标函数名：" + thisJoinPoint.getSignature().getName());

                       System.out.println("参数个数：" + thisJoinPoint.getArgs().length);

                       System.out.println("Before Advice!");

        }

        @AfterReturning(pointcut
= "pointcut()", returning = "retVal")  //返回后通知(After returning Advice)

        public void afterExecuet(Object
retVal){

                     System.out.println("返回值为：" +
retVal);

        }

        @AfterThrowing(pointcut
= "pointcut()", throwing = "ex")  //抛出异常后通知(After Throwing Advice)

        public void afterThrowing(Exception ex){

                    System.out.println("Throwing
"+ex);

        }

        @After("pointcut() && args(arg, . .)")  //后通知 (After Advice)

        public void afterExecute(Obecjt
arg){

                   System.out.print("参数值为：" +
args);

                   System.out.print("After Advice!");

        }

        @Around("pointcut()")   //环绕通知（Around Advice）
        public Object userOperate(ProceedingJoinPoint
thisJoinPoint) throws Throwable{

                   System.out.println("Around Advice!");

                    return thisJoinPoint.proceed();

         }

}

定义一个目标函数：

package com.demo.spring.test;

import org.springframework.context.ApplicationContext;

public class HelloWorld {

          public Stringexecute(String message){

                 System.out.println("Hello
" + message + "!");

                 return "Goodbye " +message;

           }

           public static void main(String[] args){  

                 //ApplicationContext ctx = new
ClassPathXmlApplicationContext("applicationContext.xml");
                 ApplicationContext ctx = new
FileSystemXmlApplicationContext("applicationContext.xml");

                 HelloWorld helloWorld = (HelloWorld)ctx.getBean("helloWorld");

                 helloWorld.execute("World");

            }

}