Spring AOP实现方式三之自动扫描注入【附源码】

注解AOP实现  这里唯一不同的就是application 里面

不需要配置每个bean都需要配置了,直接自动扫描

注册,主要知识点是怎么通过配置文件得到bean,

注意类前面的@注解。

源码结构:

image

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;

}

2、我们写一个Person类实现Love接口 类声明前面加上了

@Component 不加这个我们无法通过载入xml配置文件找到。

package com.spring.aop;

import org.springframework.stereotype.Component;

/**
 * 人对象
 * 
 * @author luwenbin006@163.com
 *
 */
@Component
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 和前面有点不同哦 @Aspect前面加上了@Service

【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;
import org.springframework.stereotype.Service;

/**
 * 注解方式 aop通知类
 * 
 * @author luwenbin006@163.com
 *
 */
@Service
@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

配置和自动扫描配置。

<?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">



    <!--组件扫描 -->
    <context:component-scan base-package="com.spring.aop" />
    <aop:aspectj-autoproxy />

    <!-- //定义扫描根路径为leot.test,不使用默认的扫描方式 <context:component-scan base-package="com.spring.aop" 
        use-default-filters="false"> // 扫描符合@Service @Repository的类 <context:include-filter 
        type="annotation" expression="org.springframework.stereotype.Service" /> 
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository" 
        /> </context:component-scan> -->
</beans>

5、编写我们spring getBean 辅助工具类 两种方式, 一种是实现 ApplicationContextAware

接口 一种是继承ApplicationObjectSupport

1、实现ApplicationContextAware接口

package com.spring.aop.springUtil;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Service;

@Service
public class SpringContextHelper implements ApplicationContextAware
{

    private ApplicationContext context;

    // 提供一个接口,获取容器中的Bean实例,根据名称获取
    public Object getBean(String beanName)
    {
        return context.getBean(beanName);
    }

    @Override
    public void setApplicationContext(ApplicationContext context)
            throws BeansException
    {
        this.context = context;

    }

}

2、继承ApplicationObjectSupport类

package com.spring.aop.springUtil;

import org.springframework.context.support.ApplicationObjectSupport;
import org.springframework.stereotype.Service;

@Service
public class SpringContextHelper2 extends ApplicationObjectSupport
{

    // 提供一个接口,获取容器中的Bean实例,根据名称获取
    public Object getBean(String beanName)
    {
        return getApplicationContext().getBean(beanName);
    }

}

6、我们之前的测试类也还是可以运行的哦~~~

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();
        }
    }
}

7、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 com.spring.aop.springUtil.SpringContextHelper;
import com.spring.aop.springUtil.SpringContextHelper2;

import junit.framework.TestCase;

public class LoveAopTest extends TestCase
{

    private SpringContextHelper helper;
    private SpringContextHelper2 helper2;
    ApplicationContext context;

    protected void setUp()
    {
        /* 开始test前的准备操作:初始化,获取数据连接... */
        context = new ClassPathXmlApplicationContext("applicationContext.xml");
        helper = (SpringContextHelper) context.getBean("springContextHelper");
        helper2 = (SpringContextHelper2) context
                .getBean("springContextHelper2");

    }

    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()
    {

        Love love = (Love) helper.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);
        }
    }

    public void testCase3()
    {

        Love love = (Love) helper2.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);
        }
    }

}

8、看控制台输出结果 调用了我们定义的aop拦截方法~~~ ok了

image_thumb[6]

 

9、源码下载地址:源码下载

 
 
 
 
posted @ 2015-04-18 23:53  luwenbin  阅读(4857)  评论(0编辑  收藏  举报