Spring AOP实现方式三之自动扫描注入【附源码】

浏览数：90 / 时间：2015年06月08日

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：

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 [email protected]
 *
 */
@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 [email protected]
 *
 */
@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);
        }
    }

}