Spring IOC

控制反转，通过一种方式（XML/注解），通过第三方去产生或者获取特定对象的方式。

《Java EE 亘联网轻量级框架整合开发－SSM 框架（ Spring MVC+Spring+MyBatis ）和 Redis 实现
》第九章实例解析-要橙汁，详细代码：https://download.youkuaiyun.com/download/xuwang777/10886388

1.  eclipse搭建spring：https://blog.youkuaiyun.com/peng86788/article/details/81166670

2.  juice.xml

<?--beans定义，根元素，引入xsd-->
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">
	 
        <?--依赖注入（setter方式）-->        
<?--定义bean编号id(自定义，首字母小写),class(类限定全名),property(定义类的属性)，name（名称），value（值）-->
	<bean id="beanPostProcessor" class="bean.BeanPostProcessorImpl"/>
	<bean id="disPosableBean" class="bean.DisposableBeanImpl"/>
	
	<bean id="source" class="pojo.Source">
		<property name="fruit" value="橙"/>
		<property name="water" value="汁"/>
		<property name="size" value="小杯"/>
		<property name="sugar" value="少糖"/>
	</bean>	
	
	<bean id="juiceMaker" class="pojo.JuiceMaker"
		destroy-method="destroy" init-method="init">
		<property name="shop" value="爱心"/>
		<property name="source" ref="source"/>
	</bean>
</beans>

eclipse配置xml自动补全功能：https://blog.youkuaiyun.com/HH775313602/article/details/70176531

tips!!!!!!!!!!!!!!!!!!!!!!!!!!!!:   class="文件上方出现的package"

2. package bean;

重写了BeanPostProcessor以及DisposableBean的三个方法，其中BeanPostProcessor针对所有Bean，DisposableBean针对IOC容器本身。

3.  package pojo;'

source.java

        public String size;
	public String fruit;
	public String water;
	public String sugar;

自动补全set/get方法：source->generate steter/getter，快捷键:Ctrl+Shift+S

JuiceMaker.java

package pojo;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class JuiceMaker implements BeanNameAware,BeanFactoryAware,ApplicationContextAware,InitializingBean{
	private String shop=null;
	private Source source=null;
	
	public String getShop() {
		return shop;
	}
	public void setShop(String shop) {
		this.shop = shop;
	}
	public Source getSource() {
		return source;
	}
	public void setSource(Source source) {
		this.source = source;
	}
	
	public String maker() {
		String juice="这是"+shop+"饮料店的"+source.getSize()+source.getSugar()+source.getFruit()+source.getWater();
		return juice;	
	}
	
	private void init() {
		System.out.println("执行自定义初始化方法");
	}
	private void destroy() {
		System.out.println("执行自定义销毁方法");
	}
	@Override
	public void afterPropertiesSet() throws Exception {
		System.out.println(this.getClass().getSimpleName()+"调用afterPropertiesSet方法");
		
	}
	@Override
	public void setApplicationContext(ApplicationContext arg0) throws BeansException {
		System.out.println(this.getClass().getSimpleName()+"调用setApplicationContext方法");
		
	}
	@Override
	public void setBeanFactory(BeanFactory arg0) throws BeansException {
		System.out.println(this.getClass().getSimpleName()+"调用setBeanFactory方法");
		
	}
	@Override
	public void setBeanName(String arg0) {
		System.out.println(this.getClass().getSimpleName()+"调用setBeanName方法");
		
	}
	
	
	
}

自定义初始化方法和销毁方法，以及一些重写方法，执行顺序后面结合实验结果详述。

4.

package main;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import pojo.JuiceMaker;

public class JuiceApplication {
	public static void main(String[] args) {
		testJuice();
	}
	public static void testJuice() {
		ClassPathXmlApplicationContext ctx=new ClassPathXmlApplicationContext("juiceapplication.xml");		
		System.out.println("初始化IOC完成");

		JuiceMaker juiceMaker=(JuiceMaker) ctx.getBean("juiceMaker");
                System.out.println("获取Bean完成");

		System.out.println(juiceMaker.maker());		
		ctx.close();

		System.out.println("结束");
	}
		
}

5.实验结果

执行步骤 ：

（1）初始化IOC容器.ClassPathXmlApplicationContex(".xml");

        load x beans

     creat shared instance (every bean id)

     初始化beans实例。

初始化中会执行.java中的方法,执行顺序如下图。

按照|.xml bean的加载顺序disposableBen->source->juiceMaker

开始实例化和实例化完成是执行BeanPostProcessor接口的PostProcessorBeforeInitialization方法和PostAfterInitialization方法，针对所有bean。

JuiceMaker.java中定义的方法的接口针对单个bean，所以只有juiceMaker实例会有那些执行语句，各种接口中的方法执行顺序如下图。

（2）获取Bean

		System.out.println("获取Bean开始");
		JuiceMaker juiceMaker=(JuiceMaker) ctx.getBean("juiceMaker");
		System.out.println("获取Bean完成");

		System.out.println(juiceMaker.maker());
		ctx.close();
		
		System.out.println("结束");

然后销毁，自定义销毁方法和针对IOC容器本身的接口DisposableBean的销毁方法。

6. 配置log4j.properties

log4j.rootLogger=INFO , stdout
log4j.logger.org.mybatis=INFO
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p %d %C: %m%n