Spring Map依赖注入

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package com.liyang;public interface Eat {       void  toSay() ; }

package com.liyang;import org.springframework.stereotype.Service;@Servicepublic class HuoGuoEatImpl implements Eat{        @Override        public void toSay() {               System.out.println("老李在吃火锅！") ;        }}

package com.liyang;import org.springframework.stereotype.Service;@Servicepublic class KfcEatImpl implements Eat{        @Override        public void toSay() {               System.out.println("老李在吃肯德基！") ;        }}

package com.liyang;import org.springframework.stereotype.Service;@Servicepublic class DongBeiEatImpl implements Eat {    @Override    public void toSay() {           System.out.println("老李在吃东北菜！") ;    }}

@Autowired  private Map<String, BaseService> map key是bean名字；value就是所有实现了BaseService的Bean

package com.liyang;import java.util.Map;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;@Servicepublic class EatFactory {       @Autowired       private  Map<String , Eat> eat ;       private  final  String suffix = "EatImpl"  ;       public enum Eater{              HUOGUO("huoGuo") , KFC("kfc") , DONGBEI("dongBei") ;              private  final  String prefix ;              private Eater(String prefix) {                      this.prefix = prefix ;              }       }       public  Eat getEater(Eater eater){               return eat.get(eater.prefix + suffix) ;        }}

package com.liyang;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.stereotype.Service;import com.liyang.EatFactory.Eater;@Servicepublic class Main {        @Autowired        public  static EatFactory  factory ;        public static void main(String[] args) {                String[] configLocations = { "applicationContext-resource.xml" };                ApplicationContext context = new ClassPathXmlApplicationContext(configLocations);                factory = context.getBean("eatFactory" , EatFactory.class) ;               //注意：首字母务必小写                factory.getEater(Eater.HUOGUO).toSay() ;                factory.getEater(Eater.KFC).toSay() ;                factory.getEater(Eater.DONGBEI).toSay() ;        }}

输出：

老李在吃火锅！
老李在吃肯德基！
老李在吃东北菜！

<?xml version="1.0" encoding="UTF-8"?><beans default-autowire="byName"       xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xmlns:context="http://www.springframework.org/schema/context"       xmlns:mvc="http://www.springframework.org/schema/mvc"       xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">   <context:component-scan base-package="com.liyang"/>  </beans>

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