吴裕雄--天生自然轻量级JAVA EE企业应用开发Struts2Sping4Hibernate整合开发学习笔记：Spring_BeanPostProcessor

<?xml version="1.0" encoding="GBK"?>
<project name="spring" basedir="." default="">
    <property name="src" value="src"/>
    <property name="dest" value="classes"/>

    <path id="classpath">
        <fileset dir="../../lib">
            <include name="**/*.jar"/>
        </fileset>
        <pathelement path="${dest}"/>
    </path>

    <target name="compile" description="Compile all source code">
        <delete dir="${dest}"/>
        <mkdir dir="${dest}"/>
        <copy todir="${dest}">
            <fileset dir="${src}">
                <exclude name="**/*.java"/>
            </fileset>        
        </copy>
        <javac destdir="${dest}" debug="true" includeantruntime="yes"
            deprecation="false" optimize="false" failonerror="true">
            <src path="${src}"/>
            <classpath refid="classpath"/>
            <compilerarg value="-Xlint:deprecation"/>
        </javac>
    </target>

    <target name="run" description="Run the main class" depends="compile">
        <java classname="lee.BeanTest" fork="yes" failonerror="true">
            <classpath refid="classpath"/>
        </java>
    </target>

</project>

<?xml version="1.0" encoding="GBK"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">
    <!-- 配置2个普通Bean实例 -->
    <bean id="steelAxe" class="org.crazyit.app.service.impl.SteelAxe"/>
    <bean id="chinese" class="org.crazyit.app.service.impl.Chinese"
        init-method="init" p:axe-ref="steelAxe" p:name="依赖注入的值"/>
    <!-- 配置Bean后处理器，可以无需指定id属性 -->
    <bean id="bp" class="org.crazyit.app.util.MyBeanPostProcessor"/>
</beans>

package lee;

import org.springframework.core.io.*;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;

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

import org.crazyit.app.service.*;
import org.crazyit.app.util.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class BeanTest
{
    public static void main(String[] args)throws Exception
    {
        // 以类加载路径下的beans.xml文件来创建Spring容器
//        ApplicationContext ctx = new
//            ClassPathXmlApplicationContext("beans.xml");
//        Person p = (Person)ctx.getBean("chinese");

        // 搜索类加载路径下的beans.xml文件创建Resource对象
        Resource isr = new ClassPathResource("beans.xml");
        // 创建默认的BeanFactory容器
        DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
        // 让默认的BeanFactory容器加载isr对应的XML配置文件
        new XmlBeanDefinitionReader(beanFactory).loadBeanDefinitions(isr);
        // 获取容器中的Bean后处理器
        BeanPostProcessor bp = (BeanPostProcessor)beanFactory.getBean("bp");
        // 注册Bean后处理器
        beanFactory.addBeanPostProcessor(bp);
        Person p = (Person)beanFactory.getBean("chinese");

        p.useAxe();
    }
}

package org.crazyit.app.service;

/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public interface Axe
{
    public String chop();
}

package org.crazyit.app.service;

/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public interface Person
{
    public void useAxe();
}

package org.crazyit.app.service.impl;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import org.crazyit.app.service.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class Chinese
    implements Person,InitializingBean
{
    private Axe axe;
    private String name;
    public Chinese()
    {
        System.out.println("Spring实例化主调bean：Chinese实例...");
    }
    public void setAxe(Axe axe)
    {
        this.axe = axe;
    }
    public void setName(String name)
    {
        System.out.println("Spring执行setName()方法注入依赖关系...");
        this.name = name;
    }
    public void useAxe()
    {
        System.out.println(name + axe.chop());
    }
    // 下面是两个生命周期方法
    public void init()
    {
        System.out.println("正在执行初始化方法 init...");
    }
    public void afterPropertiesSet() throws Exception
    {
        System.out.println("正在执行初始化方法 afterPropertiesSet...");
    }
}

package org.crazyit.app.service.impl;

import org.crazyit.app.service.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class SteelAxe
    implements Axe
{
    public SteelAxe()
    {
        System.out.println("Spring实例化依赖bean：SteelAxe实例...");
    }
    public String chop()
    {
        return "钢斧砍柴真快";
    }
}

package org.crazyit.app.util;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

import org.crazyit.app.service.*;
import org.crazyit.app.service.impl.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class MyBeanPostProcessor
    implements BeanPostProcessor
{
    /**
     * 对容器中的Bean实例进行后处理
     * @param bean 需要进行后处理的原Bean实例
     * @param beanName 需要进行后处理的Bean的配置id
     * @return 返回后处理完成后的Bean
     */
    public Object postProcessBeforeInitialization
        (Object bean , String beanName)
    {
        System.out.println("Bean后处理器在初始化之前对"
            + beanName + "进行增强处理...");
        // 返回的处理后的Bean实例，该实例就是容器中实际使用的Bean
        // 该Bean实例甚至可与原Bean截然不同
        return bean;
    }
    public Object postProcessAfterInitialization
        (Object bean , String beanName)
    {
        System.out.println("Bean后处理器在初始化之后对"
            + beanName + "进行增强处理...");
        // 如果该Bean是Chinese类的实例
        if (bean instanceof Chinese)
        {
            // 修改其name成员变量
            Chinese c = (Chinese)bean;
            c.setName("疯狂iOS讲义");
        }
        return bean;
    }
}