【Spring 核心】装配bean（三）XML配置

2019-11-08 01:58:08

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项目包结构：

src/main/java

com.bonc.pojo--|-CompactDisc.java （接口）

|-SgtPeppers.java （实现类实现 CompactDisc）

|-BlankDisc.java （实现类实现 CompactDisc）

|-MediaPlayer.java （接口）

|-CDPlayer.java （实现类实现 MediaPlayer）

src/main/resources

sPRing.xml （Spring应用上下文配置信息）

接口 CompactDisc.java

package com.bonc.pojo;public interface CompactDisc {	void  play();}实现类 SgtPeppers.java
package com.bonc.pojo;public class SgtPeppers implements CompactDisc {		private String title = "Sgt. Pepper's Lonely Hearts Club Band";	private String artist = "The Beatles";	public void play() {			System.out.println("Playing "+title+"by"+artist);	}	public SgtPeppers() {		super();	}	//自定义带参构造器	public SgtPeppers(String title, String artist) {		super();		this.title = title;		this.artist = artist;	}}实现类 BlankDisc.java
package com.bonc.pojo;import java.util.List;public class BlankDisc implements CompactDisc {	private String title;	private String artist;	private List<String> tracks;	public void play() {		System.out.println("Playing "+title+" by "+artist);		for(String track:tracks){			System.out.println("-Track: "+track);		}	}	//自定义带参构造器	public BlankDisc(String title, String artist, List<String> tracks) {		super();		this.title = title;		this.artist = artist;		this.tracks = tracks;	}	public String getTitle() {		return title;	}	public void setTitle(String title) {		this.title = title;	}	public String getArtist() {		return artist;	}	public void setArtist(String artist) {		this.artist = artist;	}	public List<String> getTracks() {		return tracks;	}	public void setTracks(List<String> tracks) {		this.tracks = tracks;	}	}接口 MediaPlayer.java
package com.bonc.pojo;public interface MediaPlayer {	void play();}实现类CDPlayer.java
package com.bonc.pojo;public class CDPlayer implements MediaPlayer{	private CompactDisc cd;		public CDPlayer(){		super();	}		public CDPlayer(CompactDisc cd){		this.cd = cd;	}	public void play() {		cd.play();	}	public void setCd(CompactDisc cd) {		this.cd = cd;	}	}Spring.xml配置信息
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"	xmlns:c="http://www.springframework.org/schema/c"	xmlns:p="http://www.springframework.org/schema/p"	xmlns:util="http://www.springframework.org/schema/util"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xmlns:aop="http://www.springframework.org/schema/aop"    xmlns:tx="http://www.springframework.org/schema/tx"     xmlns:context="http://www.springframework.org/schema/context"    xsi:schemaLocation="     http://www.springframework.org/schema/beans      http://www.springframework.org/schema/beans/spring-beans-4.0.xsd     http://www.springframework.org/schema/tx      http://www.springframework.org/schema/tx/spring-tx-4.0.xsd     http://www.springframework.org/schema/aop      http://www.springframework.org/schema/aop/spring-aop-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/util     http://www.springframework.org/schema/util/spring-util.xsd">	<!--	 一、XML配置说明：	在Spring刚刚出现的时候，XML是描述配置的主要方式。	尽管Spring长期以来确实与XML有着关联，但需要说明的是，XML不再是配置Spring的唯一方案。	鉴于已经存在那么多基于XML的Spring配置，所以理解如何在Spring中配置XML还是很重要的。	本篇文章在于帮助你维护已有的XML配置，在完成新的Spring工作时，希望你使用自动化配置和JavaConfig     			如果不给出ID属性，这个bean会根据全限定类名来进行命名	本例中为 com.bonc.pojo.SgtPeppers#0 #0是一个计数的形式，用来区分其他相同类型的bean -->	<bean id="compactDisc" class="com.bonc.pojo.SgtPeppers"/>	<!--	二、借助构造器初始化bean有两种方案：	1. <constructor-arg>元素	2. 使用Spring3.0所引入的c-命名空间-->	 <bean id="cdPlayer" class="com.bonc.pojo.CDPlayer">	 	<constructor-arg  ref="compactDisc"/>	 </bean><!-- 	c:cd-ref 	c（命名空间的前缀）-构造器的参数名-ref（告诉Spring 正在装配的是一个bean的引用）		也可以使用参数在参数列表中的位置信息	c:_0-ref="compactDisc"-->	 <bean id="cdPlayer2" class="com.bonc.pojo.CDPlayer" c:cd-ref="compactDisc"/>	 <!--	  装配字面量 -->	 <bean id="compactDisc" class="com.bonc.pojo.SgtPeppers">	 	<constructor-arg value="Sgt. Pepper's Lonely Hearts Club Band"/>	 	<constructor-arg value="The Beatles"/>	 </bean>	 <bean id="compactDisc" class="com.bonc.pojo.SgtPeppers"	 	c:_title="gt. Pepper's Lonely Hearts Club Band"	 	c:_artist="The Beatles"/>	 <bean id="compactDisc" class="com.bonc.pojo.SgtPeppers"	 	c:_0="gt. Pepper's Lonely Hearts Club Band"	 	c:_1="The Beatles"/><!-- 	装配list  -->	 <bean id="compactDisc" class="com.bonc.pojo.BlankDisc">	 	<constructor-arg  value="Sgt. Pepper's Lonely Hearts Club Band"/>	 	<constructor-arg  value="The Beatles"/>	 	<constructor-arg>	 		<list>	 			<value>Sgt.Pepper's warm heart</value>	 			<value>With a little help from My Friends</value>	 			<value>in the Sky with Diamonds</value>	 			<value>Getting Better</value>	 			<value>Fixing A Hole</value>	 		</list>	 	</constructor-arg>	 </bean><!-- 装配set -->	<bean id="compactDisc" class="com.bonc.pojo.BlankDisc">	 	<constructor-arg  value="Sgt. Pepper's Lonely Hearts Club Band"/>	 	<constructor-arg  value="The Beatles"/>	 	<constructor-arg>	 		<set>	 			<value>Sgt.Pepper's warm heart</value>	 			<value>With a little help from My Friends</value>	 			<value>in the Sky with Diamonds</value>	 			<value>Getting Better</value>	 			<value>Fixing A Hole</value>	 		</set>	 	</constructor-arg>	 </bean>	 <!-- 	三、属性初始化bean -->	<bean id="compactDisc" class="com.bonc.pojo.BlankDisc">		<property name="title" value="Sgt. Pepper's Lonely Hearts Club Band"/>		<property name="artist"value="The Beatles"/>		<property name="tracks">			<list>				<value>Sgt.Pepper's warm heart</value>	 			<value>With a little help from My Friends</value>	 			<value>in the Sky with Diamonds</value>	 			<value>Getting Better</value>	 			<value>Fixing A Hole</value>			</list>		</property>	</bean><!-- 	四、使用Spring util-命名空间简化bean配置		首先需要在XML中声明util-命名空间及其模式		util:list只是util-命名空间中的多个元素之一 --> 	<util:list id="trackList">		<value>Sgt.Pepper's warm heart</value>		<value>With a little help from My Friends</value>		<value>in the Sky with Diamonds</value>		<value>Getting Better</value>		<value>Fixing A Hole</value> 		 	</util:list> 	<bean id="compactDisc" class="com.bonc.pojo.BlankDisc" 		p:title="Sgt. Pepper's Lonely Hearts Club Band" 		p:artist="The Beatles" 		p:track-ref="trackList"/> 	</beans>