Spring 註解例項[email protected] 注入到List和Map
阿新 • • 發佈：2019-01-01
package com.Autowired.ListMap;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* order：把實現類排序輸出 只適合List
* @author liu
*
*/
@Order(2)
@Component
public class BeanImplOne implements BeanInterface {
}
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package com.Autowired.ListMap; import org.springframework.core.annotation.Order; import org.springframework.stereotype.Component; @Order(1) @Component public class BeanImplTwo implements BeanInterface { }
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BeanInterface只是一個介面無方法
======================================
package com.Autowired.ListMap; import java.util.List; import java.util.Map; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.stereotype.Component; @Component public class BeanInvoke { @Autowired private List<BeanInterface> list; @Autowired private Map<String,BeanInterface> map; /** @Autowired預設為byType的 所以有兩個相同型別的bean * 如果不使用 @Qualifier指定具體的bean就會丟擲異常 * private BeanInterface beaninterface; */ @Autowired @Qualifier("beanImplOne") private BeanInterface beaninterface; public void say(){ System.out.println("list..."); if(null !=list &&0!=list.size()){ for(BeanInterface bean :list){ System.out.println(bean.getClass().getName()); } }else{ System.out.println("List<BeanInterface> list is null !!!!"); } System.out.println(); System.out.println("map..."); if(null !=map &&0!=map.size()){ for(Map.Entry<String, BeanInterface> m:map.entrySet()){ System.out.println(m.getKey()+" "+m.getValue().getClass().getName()); } }else{ System.out.println("Map<String,BeanInterface> map is null !!!!"); } System.out.println("-------------------------"); if(null !=beaninterface){ System.out.println(beaninterface.getClass().getName()); }else{ System.out.println("beaninterface is null !!!"); } } }
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配置檔案：
<?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:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd" > <context:component-scan base-package="package com.Autowired.ListMap;"></context:component-scan> </beans>
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測試類：package com.Autowired.ListMap;
import org.junit.Test;
import com.imooc.test.base.UnitTestBase;
public class TestListMap extends UnitTestBase{
public TestListMap(){
super("classpath*:spring-beanannotation3.xml");
}
@Test
public void test(){
BeanInvoke bean=super.getBean("beanInvoke");
bean.say();
}
}
結果：
2017-6-4 15:38:26 org.springframework.context.support.AbstractApplicationContext prepareRefresh
資訊: Refreshing org[email protected]58a17083: startup date [Sun Jun 04 15:38:26 CST 2017]; root of context hierarchy
2017-6-4 15:38:26 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
資訊: Loading XML bean definitions from URL [file:/E:/myeclipse/workspace/Spring2/bin/spring-beanannotation3.xml]
2017-6-4 15:38:27 org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor <init>
資訊: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
list...
2017-6-4 15:38:27 org.springframework.context.support.AbstractApplicationContext doClose
資訊: Closing org[email protected]58a17083: startup date [Sun Jun 04 15:38:26 CST 2017]; root of context hierarchy
com.Autowired.ListMap.BeanImplTwo
com.Autowired.ListMap.BeanImplOne
map...
beanImplOne com.Autowired.ListMap.BeanImplOne
beanImplTwo com.Autowired.ListMap.BeanImplTwo
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com.Autowired.ListMap.BeanImplOne