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_staticFactory

<?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.SpringTest" 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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">
    <!-- 下面配置驱动Spring调用BeingFactory的静态getBeing()方法来创建Bean
    该bean元素包含的constructor-arg元素用于为静态工厂方法指定参数，
    因此这段配置会驱动Spring以反射方式来执行如下代码：
    dog = org.crazyit.app.factory.BeingFactory.getBeing("dog"); -->
    <bean id="dog" class="org.crazyit.app.factory.BeingFactory"
        factory-method="getBeing">
        <!-- 配置静态工厂方法的参数 -->
        <constructor-arg value="dog"/>
        <!-- 驱动Spring以"我是狗"为参数来执行dog的setMsg()方法 -->
        <property name="msg" value="我是狗"/>
    </bean>
    <!--  下面配置会驱动Spring以反射方式来执行如下代码：
    dog = org.crazyit.app.factory.BeingFactory.getBeing("cat"); -->
    <bean id="cat" class="org.crazyit.app.factory.BeingFactory"
        factory-method="getBeing">
        <!-- 配置静态工厂方法的参数 -->
        <constructor-arg value="cat"/>
        <!-- 驱动Spring以"我是猫"为参数来执行dog的setMsg()方法 -->
        <property name="msg" value="我是猫"/>
    </bean>
</beans>

package lee;

import org.springframework.context.*;
import org.springframework.context.support.*;

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 [email protected]
 * @version  1.0
 */
public class SpringTest
{
    public static void main(String[] args)
    {
        // 以类加载路径下的配置文件创建ClassPathResource实例
        ApplicationContext ctx = new
            ClassPathXmlApplicationContext("beans.xml");
        Being b1 = ctx.getBean("dog" , Being.class);
        b1.testBeing();
        Being b2 = ctx.getBean("cat" , Being.class);
        b2.testBeing();
    }
}

package org.crazyit.app.factory;

import 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 [email protected]
 * @version  1.0
 */
public class BeingFactory
{
    // 返回Being实例的静态工厂方法
    // arg参数决定返回哪个Being类的实例
    public static Being getBeing(String arg)
    {
        // 调用此静态方法的参数为dog，则返回Dog实例
        if (arg.equalsIgnoreCase("dog"))
        {
            return new Dog();
        }
        // 否则返回Cat实例
        else
        {
            return new Cat();
        }
    }
}

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 [email protected]
 * @version  1.0
 */
public interface Being
{
    public void testBeing();
}

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 [email protected]
 * @version  1.0
 */
public class Cat implements Being
{
    private String msg;
    // msg的setter方法
    public void setMsg(String msg)
    {
        this.msg = msg;
    }
    // 实现接口必须实现的testBeing方法
    public void testBeing()
    {
        System.out.println(msg +
            "，猫喜欢吃老鼠");
    }
}

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 [email protected]
 * @version  1.0
 */
public class Dog implements Being
{
    private String msg;
    // msg的setter方法
    public void setMsg(String msg)
    {
        this.msg = msg;
    }
    // 实现接口必须实现的testBeing()方法
    public void testBeing()
    {
        System.out.println(msg +
            "，狗爱啃骨头");
    }
}