观看慕课moocer老师视频Spring Bean装配之Autowire注解说明-2

数组及Map的自动注入：

1、@controller 控制器（注入服务）
2、@service 服务（注入dao）
3、@repository dao（实现dao访问）
4、@component （把普通pojo实例化到spring容器中，相当于配置文件中的<bean id="" class=""/>）

（以上摘自https://blog.csdn.net/thinkingcao/article/details/71171222）

List方式：

package com.imooc.beanannotation.multibean;public interface BeanInterface {}

package com.imooc.beanannotation.multibean;import org.springframework.stereotype.Component;@Component
public class BeanImplOne implements BeanInterface {}

package com.imooc.beanannotation.multibean;import org.springframework.stereotype.Component;@Component
public class BeanImplTwo implements BeanInterface {}

package com.imooc.beanannotation.multibean;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;@Component
public class BeanInvoker {@Autowiredprivate List<BeanInterface> list;public void say(){if(null!=list){for(BeanInterface bean:list){System.out.println(bean.getClass().getName());//getClass().getName()是用来返回Class对象所代表的具体对象的名称。}}else{System.out.println("List<BeanInterface> list is null");}}}

package com.imooc.test.beanannotation;import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;import com.imooc.ioc.injection.service.InjectionService;
import com.imooc.ioc.interfaces.UnitTestBase;@RunWith(BlockJUnit4ClassRunner.class)
public class TestBeanAnnotation extends UnitTestBase{public TestBeanAnnotation(){super("classpath*:spring-beanannotation.xml");}@Testpublic void testAutowired(){InjectionService service=super.getBean("injectionServiceImpl");service.save("This is autowired.");}
}

package com.imooc.test.beanannotation;import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;import com.imooc.beanannotation.multibean.BeanInvoker;
import com.imooc.ioc.injection.service.InjectionService;
import com.imooc.ioc.interfaces.UnitTestBase;@RunWith(BlockJUnit4ClassRunner.class)
public class TestInjection extends UnitTestBase {public TestInjection(){super("classpath*:spring-beanannotation.xml");}@Testpublic void testAutowired(){InjectionService service=super.getBean("injectionServiceImpl");service.save("This is autowired");}@Testpublic void testMutiBean(){BeanInvoker invoker=super.getBean("beanInvoker");invoker.say();}
}

运行结果：

说明：Autowired注解能够完成把BeanInterface的两个实现类注解到list当中去

Map方式：

更改：

package com.imooc.beanannotation.multibean;import java.util.List;
import java.util.Map;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;@Component
public class BeanInvoker {@Autowiredprivate List<BeanInterface> list;@Autowiredprivate Map<String,BeanInterface> map;public void say(){if(null!=list&&0!=list.size()){System.out.println("list.");for(BeanInterface bean:list){System.out.println(bean.getClass().getName());}}else{System.out.println("List<BeanInterface> list is null");}System.out.println();if(null!=map&&0!=map.size()){System.out.println("map.");for(Map.Entry<String,BeanInterface> entry:map.entrySet()){System.out.println(entry.getKey()+"   "+entry.getValue().getClass().getName());}}else{System.out.println("Map<String,BeanInterface> is null");}}}

运行结果：

使用注解来实现：

package com.imooc.beanannotation.multibean;import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;@Order(2)
@Component
public class BeanImplOne implements BeanInterface {}

package com.imooc.beanannotation.multibean;import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;@Order(1)
@Component
public class BeanImplTwo implements BeanInterface {}

运行结果：

说明：Order方法只针对于数组也就是list类型有效，对map无效（根据key来取值）。

区别：List是把bean的对象放进来；Map是把bean的id及bean的name和bean的实例一起放进来。

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