【Spring 核心】装配bean（三）XML配置

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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>

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