【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>

原文链接：https://www.f2er.com/xml/294425.html

【Spring 核心】装配bean（三）XML配置

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