一個完成的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" > 
        <!-- 通過構造方法設置屬性值 -->
        <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>
    
        <!-- 建立一個Instrumentalist bean 
        @通過property為bean設置屬性值,一旦instrumentalist被實例化，則對象會被賦此值
    -->
    <bean id="Kenny" class="com.springinaction.springidol.Instrumentalist">
        <property name="song" value="Jingle Bells"></property>
        <property name="age" value="37"></property>
        
        <!-- 這種做法可以實現接口與類的松耦合,比如下面兩個都實現了Instrument接口的樂器類，Kenny bean可以隨意引用 -->
        <!-- 
        <property name="instrument" ref="saxphone"></property> 
        <property name="instrument" ref="piano"></property> 
        -->
        <!-- 內部bean的使用方式，這里用在property，constructor里面也是一樣用 -->
        <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命名空間用法 -->
    <bean id="Kenny2" class="com.springinaction.springidol.Instrumentalist" 
        p:song="Lemon Tree" p:age="30" p:instrument-ref="saxphone"    >
    </bean>
    
    <!-- 為集合配置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的寫法 -->
    <bean id="hank2" class="com.springinaction.springidol.OneManBand">
        <property name="instruments">
            <props>
                <!-- key和value都為String -->
                <prop key="piano">la la la</prop> 
                <prop key="saxphone">ta ta ta</prop>
            </props>
        </property>
    </bean>
    
    <!-- 賦null值 -->
    <!-- 
    ...
        <property name="xxx"><null/></property>
    ...
     -->
</beans>

 

package com.springinaction.springidol;

/**
 * 
 * @author Alan.chen
 * @定義表演者
 * @類型：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("彈得一手好琴。。。");
    }

}

package com.springinaction.springidol;

/**
 * 
 * @author Alan.chen
 * @詩人實現類
 */
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屬性示例，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();
        }            
    }
    
    //當被注入的對象時集合時
    private Collection<Instrument> instruments;

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

    public void setInstruments(Collection<Instrument> instruments) {
        this.instruments = instruments;
    }
    
    
    //當被注入的對象是map時
    private Map<String,Instrument> instruments2;

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

    public void setInstruments2(Map<String, Instrument> instruments2) {
        this.instruments2 = instruments2;
    }
    
    //當被注入的map的key和value都是String時，可以用properties來代替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();
        }
    }
}