一个完成的spring xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="duke" class="com.springinaction.springidol.Juggler" >
        <!-- 通过构造方法设置属性值 -->
        <constructor-arg value="15"></constructor-arg>
    </bean>

    <bean id="sonnect29" class="com.springinaction.springidol.Sonnet29"></bean>

    <bean id="poeticPoem" class="com.springinaction.springidol.PoeticJuggler">
        <constructor-arg value="15"></constructor-arg>
        <constructor-arg ref="sonnect29"></constructor-arg>
    </bean>

        <!-- 建立一个Instrumentalist bean
        @通过property为bean设置属性值,一旦instrumentalist被实例化，则对象会被赋此值
    -->
    <bean id="Kenny" class="com.springinaction.springidol.Instrumentalist">
        <property name="song" value="Jingle Bells"></property>
        <property name="age" value="37"></property>

        <!-- 这种做法可以实现接口与类的松耦合,比如下面两个都实现了Instrument接口的乐器类，Kenny bean可以随意引用 -->
        <!--
        <property name="instrument" ref="saxphone"></property>
        <property name="instrument" ref="piano"></property>
        -->
        <!-- 内部bean的使用方式，这里用在property，constructor里面也是一样用 -->
        <property name="instrument">
            <bean class="com.springinaction.springidol.piano"></bean>
        </property>
    </bean>

    <bean id="saxphone" class="com.springinaction.springidol.saxphone"></bean>
    <bean id="piano" class="com.springinaction.springidol.piano"></bean>

    <!-- p命名空间用法 -->
    <bean id="Kenny2" class="com.springinaction.springidol.Instrumentalist"
        p:song="Lemon Tree" p:age="30" p:instrument-ref="saxphone"    >
    </bean>

    <!-- 为集合配置bean -->
    <bean id="hank" class="com.springinaction.springidol.OneManBand">
        <property name="instruments">
            <list>
                <ref bean="piano" />
                <ref bean="saxphone" />
            </list>
        </property>
        <property name="instruments2">
            <map>
                <entry key="piano" value-ref="piano"></entry>
                <entry key="saxphone" value-ref="saxphone"></entry>
            </map>
        </property>
    </bean>

    <!-- properties的写法 -->
    <bean id="hank2" class="com.springinaction.springidol.OneManBand">
        <property name="instruments">
            <props>
                <!-- key和value都为String -->
                <prop key="piano">la la la</prop>
                <prop key="saxphone">ta ta ta</prop>
            </props>
        </property>
    </bean>

    <!-- 赋null值 -->
    <!--
    ...
        <property name="xxx"><null/></property>
    ...
     -->
</beans>

package com.springinaction.springidol;

/**
 *
 * @author Alan.chen
 * @定义表演者
 * @类型：接口
 */

public interface Proformer {
    void perform() throws Exception;
}

package com.springinaction.springidol;

public interface Instrument {
    public void play();
}

package com.springinaction.springidol;

public class saxphone implements Instrument {

    public saxphone() {
    }

    @Override
    public void play() {
        System.out.println("toot toot toot");
    }

}

package com.springinaction.springidol;

public class piano implements Instrument {

    public piano(){

    }

    @Override
    public void play() {
        System.out.println("弹得一手好琴。。。");
    }

}

package com.springinaction.springidol;

/**
 *
 * @author Alan.chen
 * @诗人实现类
 */
public class Sonnet29 implements Poem {

    private static String[] LINES = {
        "When in disgrace with fortune and men's eyes，",
        "I all alone beweep my outcast state，",
        "And trouble deaf heaven with my bootless cries，",
        "And look upon myself， and curse my fate，",
        "Wishing me like to one more rich in hope，",
        "Featured like him， like him with friends posses'd，",
        "Desiring this man's art， and that man's scope，",
        "With what I most enjoy contented least；",
        "Yet in these thoughts myself almost despising，",
        "Haply I think on thee，－and then my state",
        "（Like to the lark at break of day arising From sullen earth） sings hymns at heaven's gate；",
        "For thy sweet love remember'd ， such wealth brings，",
        "That then I scorn to change my state with kings．！"
    };

    Sonnet29(){

    }

    @Override
    public void recite() {
        for(int i=0;i<LINES.length;i++)
            System.out.println(LINES[i]);
    }

}

package com.springinaction.springidol;

/**
 *
 * @author Alan.chen
 * @注入Bean属性示例，用setXXX()，getXXX()接收
 * @描述：Instrumentalist,演奏家
 */
public class Instrumentalist implements Proformer {

    public Instrumentalist() {
    }

    private int age;

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public void perform() throws Exception {
        System.out.println("playing "+song+" : ");
        instrument.play();
    }

    private String song;
    public void setSong(String song){
        this.song = song;
    }

    public String getSong(){
        return song;
    }

    public String screamSong(){
        return song;
    }

    private Instrument instrument;
    public void setInstrument(Instrument instrument){
        this.instrument = instrument;
    }

}

package com.springinaction.springidol;

import java.util.Collection;
import java.util.Map;

public class OneManBand implements Proformer {

    public OneManBand() {
    }

    @Override
    public void perform() throws Exception {
        for(Instrument instrument:instruments)
            instrument.play();
        for(String key:instruments2.keySet()){
            System.out.println(key + " : ");
            Instrument instrument = instruments2.get(key);
            instrument.play();
        }
    }

    //当被注入的对象时集合时
    private Collection<Instrument> instruments;

    public Collection<Instrument> getInstruments() {
        return instruments;
    }

    public void setInstruments(Collection<Instrument> instruments) {
        this.instruments = instruments;
    }

    //当被注入的对象是map时
    private Map<String,Instrument> instruments2;

    public Map<String, Instrument> getInstruments2() {
        return instruments2;
    }

    public void setInstruments2(Map<String, Instrument> instruments2) {
        this.instruments2 = instruments2;
    }

    //当被注入的map的key和value都是String时，可以用properties来代替map
    //private Properties instruments3;
//    public void setInstruments3(Properties instruments2) {
//        this.instruments2 = instruments3;
//    }

}

package com.springinaction.springidol;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext(
                "com/springinaction/springidol/spring-idol.xml");
//        Proformer performer = (Proformer)ctx.getBean("duke");
//        Proformer performer = (Proformer)ctx.getBean("poeticPoem");
//        Proformer performer = (Proformer)ctx.getBean("Kenny2");
        Proformer performer = (Proformer)ctx.getBean("hank");
        try {
            performer.perform();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}