【Spring 核心】装配bean（三）XML配置

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>