spring创建策略模式的两种方式（xml配置和纯注解）

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策略模式是很好用的设计模式，spring实现策略模式更加简化了代码流程：

xml和纯注解都可以实现，但是纯注解更加方便，没有配置，更加方便：先看注解的方式：

公共接口被实现

package org.gyy.strategy.iface;public interface IContextStrategy {void say(String name);}

实现类：

package org.gyy.strategy.impl;import org.gyy.strategy.iface.IContextStrategy;import org.springframework.stereotype.Component;@Componentpublic class ALIContextStrategy implements IContextStrategy {@Overridepublic void say(String name) {System.out.println("阿里巴巴集团欢迎你："+name);}}

package org.gyy.strategy.impl;import org.gyy.strategy.iface.IContextStrategy;import org.springframework.stereotype.Component;@Componentpublic class BDUContextStrategy implements IContextStrategy{@Overridepublic void say(String name) {// TODO Auto-generated method stubSystem.out.println("百度集团欢迎你："+name);}}

package org.gyy.strategy.impl;import org.gyy.strategy.iface.IContextStrategy;import org.springframework.stereotype.Component;@Componentpublic class TENContextStrategy implements IContextStrategy {@Overridepublic void say(String name) {// TODO Auto-generated method stubSystem.out.println("腾讯集团欢迎你："+name);}}

工厂：spring在对map注入时，会将类名作为key

package org.gyy.strategy;import java.util.HashMap;import java.util.Map;import javax.annotation.Resource;import org.gyy.strategy.iface.IContextStrategy;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;@Componentpublic class ContextStrategyFactory {@Autowiredprivate   Map<String, IContextStrategy> contextStrategy = new HashMap<String,IContextStrategy>();public Map<String, IContextStrategy> getContextStrategy() {return contextStrategy;}public void setContextStrategy(Map<String, IContextStrategy> contextStrategy) {this.contextStrategy = contextStrategy;}public IContextStrategy doStrategy(String type){return this.contextStrategy.get(type);}}

测试：

package org.gyy.strategy;import javax.annotation.Resource;import org.gyy.baseTest.BaseJunit4Test;import org.gyy.strategy.iface.IContextStrategy;import org.junit.Test;public class StrategyTest extends BaseJunit4Test {@Resourceprivate ContextStrategyFactory strategyFactory;@Testpublic void testStrategy(){IContextStrategy doStrategy = strategyFactory.doStrategy("ALIContextStrategy");doStrategy.say("张三");}}

到这里就是全部的基本实现，如果有复杂的业务需求，可以组合实现具体的方法，

下面是xml的配置，没增加一个实现类就要在map加一个键值对，特别的麻烦：

 <bean id="contextStrategyFactory" class="org.gyy.strategy.ContextStrategyFactory">       <property name="contextStrategy">       <map>       <entry key="1" value-ref="aLIContextStrategy"/>       <entry key="2" value-ref="bDUContextStrategy"/>       <entry key="3" value-ref="tENContextStrategy"/>       </map>       </property>   </bean>   <bean id="aLIContextStrategy" class="org.gyy.strategy.impl.ALIContextStrategy"/>   <bean id="bDUContextStrategy" class="org.gyy.strategy.impl.BDUContextStrategy"/>   <bean id="tENContextStrategy" class="org.gyy.strategy.impl.TENContextStrategy"/>

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