Spring AOP实现方式三【附源码】

注解AOP实现

源码结构：

1、首先我们新建一个接口，love 谈恋爱接口。

package com.spring.aop;

/**
 * 谈恋爱接口
 *
 * @author Administrator
 *
 */
public interface Love
{

    /*
     * 谈恋爱方法
     */
    void fallInLove();
    void test() throws Exception;

}
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2、我们写一个Person类实现Love接口

package com.spring.aop;

/**
 * 人对象
 *
 * @author [email protected]
 *
 */
public class Person implements Love
{

    /*
     * 重写谈恋爱方法
     */
    @Override
    public void fallInLove()
    {
        System.out.println("谈恋爱了...");
    }

    @Override
    public void test() throws Exception
    {
        // TODO Auto-generated method stub
        throw new Exception("我就说你们在一起不会幸福的，你能拿我怎么滴？");
    }

}

3、下面我们来写aop 注解通知类【执行方法前执行方法后执行方法前后也称为环绕方法方法执行过程中抛出异常】

package com.spring.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
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;

/**
 * 注解方式 aop通知类
 *
 * @author [email protected]
 *
 */
@Aspect
public class LoveHelper
{

    @Pointcut("execution(* com.spring.aop.*..*(..))")
    private void loveMethod()
    {
    }// 定义一个切入点

    // 在调用方法之前执行 执行拦截包com.spring.aop.*下所有的方法
    @Before("execution(* com.spring.aop.*..*(..))")
    public void before(JoinPoint point) throws Throwable
    {
        System.out.println("before::method "
                + point.getTarget().getClass().getName() + "."
                + point.getSignature().getName());
        System.out.println("谈恋爱之前必须要彼此了解！");
    }

    // 在调用方法前后执行
    @Around("execution(* com.spring.aop.*..*(..))")
    public Object around(ProceedingJoinPoint point) throws Throwable
    {
        System.out.println("around::method "
                + point.getTarget().getClass().getName() + "."
                + point.getSignature().getName());
        if (point.getArgs().length > 0)
        {

            return point.proceed(point.getArgs());

        }
        else
        {

            return point.proceed();
        }
    }

    // 在调用方法之后执行
    @After("execution(* com.spring.aop.*..*(..))")
    public void afterReturning(JoinPoint point) throws Throwable
    {
        System.out.println("method " + point.getTarget().getClass().getName()
                + "." + point.getSignature().getName());
        System.out.println("我们已经谈了5年了，最终还是分手了！");
        // System.out.println("我们已经谈了5年了，最终步入了结婚的殿堂！");
    }

    // 当抛出异常时被调用
    @AfterThrowing(value = "execution(* com.spring.aop.*..*(..))", throwing = "ex")
    public void doThrowing(JoinPoint point, Throwable ex)
    {
        System.out.println("doThrowing::method "
                + point.getTarget().getClass().getName() + "."
                + point.getSignature().getName() + " throw exception");
        System.out.println(ex.getMessage());
    }

}

4、配置好application.xml 就配置好bean和aop通知类加上一句启用注解模式配置。

<?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:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">

    <!-- 配置bean -->
    <bean id="person" class="com.spring.aop.Person">
    </bean>

    <!-- 配置通知方法类 -->
    <bean id="loveHelper" class="com.spring.aop.LoveHelper">
    </bean>

     <aop:aspectj-autoproxy />

</beans>

5、写上我们的测试类测试下效果嘿嘿~~~

package com.spring.aop;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.spring.aop.Love;

public class LoveTest
{

    public static void main(String[] args)
    {
        ApplicationContext appCtx = new ClassPathXmlApplicationContext(
                "applicationContext.xml");
        Love love = (Love) appCtx.getBean("person");
        love.fallInLove();
        try
        {
            // 测试异常捕获
            love.test();
        }
        catch (Exception e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

6、或者写上Junit测试类

package com.love.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.spring.aop.Love;

import junit.framework.TestCase;

public class LoveAopTest extends TestCase
{

    protected void setUp()
    {
        /* 开始test前的准备操作:初始化,获取数据连接... */

    }

    protected void tearDown()
    {
        /* 完成test后的清理工作:关闭文件, 关闭数据连接... */

    }

    public void testCase2()
    {
        ApplicationContext appCtx = new ClassPathXmlApplicationContext(
                "applicationContext.xml");
        Love love = (Love) appCtx.getBean("person");
        love.fallInLove();
        try
        {
            // 测试异常捕获
            love.test();
        }
        catch (Exception e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
            assertTrue(true);
        }
    }

}

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7、看控制台输出结果调用了我们定义的aop拦截方法~~~ ok了

8、源码下载地址：源码下载

时间： 2024-10-26 18:39:46