动态加载 bean 到Spring Context

动态Bean的实现类 

Java代码  

1. import java.io.IOException;  
2.   
3. import org.springframework.beans.BeansException;  
4. import org.springframework.beans.factory.support.BeanDefinitionRegistry;  
5. import org.springframework.beans.factory.xml.ResourceEntityResolver;  
6. import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;  
7. import org.springframework.context.ApplicationContext;  
8. import org.springframework.context.ApplicationContextAware;  
9. import org.springframework.context.ConfigurableApplicationContext;  
10.   
11. /** 
12.  *  
13.  * This class used to dynamic loan bean to spring context during runtime 
14.  *  
15.  * 
16.  */  
17. public class DynamicLoadBean implements ApplicationContextAware{  
18.   
19.     private ConfigurableApplicationContext applicationContext = null;  
20.     public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {  
21.         this.applicationContext = (ConfigurableApplicationContext)applicationContext;  
22.     }  
23.     public ConfigurableApplicationContext getApplicationContext() {  
24.         return applicationContext;  
25.     }  
26.       
27.     /** 
28.      * 向spring的beanFactory动态地装载bean 
29.      * @param configLocationString 要装载的bean所在的xml配置文件位置。 
30. spring配置中的contextConfigLocation，同样支持诸如"/WEB-INF/ApplicationContext-*.xml"的写法。 
31.      */  
32.     public void loadBean(String configLocationString){  
33.         XmlBeanDefinitionReader beanDefinitionReader = new XmlBeanDefinitionReader((BeanDefinitionRegistry)getApplicationContext().getBeanFactory());  
34.         beanDefinitionReader.setResourceLoader(getApplicationContext());  
35.         beanDefinitionReader.setEntityResolver(new ResourceEntityResolver(getApplicationContext()));  
36.         try {  
37.             String[] configLocations = new String[]{configLocationString};  
38.             for(int i=0;i<configLocations.length;i++)  
39.                 beanDefinitionReader.loadBeanDefinitions(getApplicationContext().getResources(configLocations[i]));  
40.         } catch (BeansException e) {  
41.             // TODO Auto-generated catch block  
42.             e.printStackTrace();  
43.         } catch (IOException e) {  
44.             // TODO Auto-generated catch block  
45.             e.printStackTrace();  
46.         }  
47.     }  
48. }  

测试类如下 

Java代码  

1. ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:data-access-config.xml");     
2.         DynamicLoadBean dynamicBeanLoad =(DynamicLoadBean)ctx.getBean("dynamicLoadBean");  
3.   
4. dynamicBeanLoad.loadBean("data-access-dynamicConfig.xml");  
5. MagazineService magezineService = (MagazineService)ctx.getBean("magazineService");   

data-access-config.xml文件中包含原始的bean, data-access-dynamicConfig.xml文件中包含要动态加载的bean的配置文件。 

不要忘了把DyanmicLoanBean 配置到原始的spring context 配置文件中也就时data-access-config.xml中

Java代码  

1. <bean id="dynamicLoadBean" class="com.spring.dynamic.DynamicLoadBean">         
2. </bean>  

动态加载的bean的配置文件 

Java代码  

1. <bean id="magazineService" class="com.ibank.test.openjpa.dao.MagazineServiceImpl">    
2.    <property name="magazineDao" ref="magazineDao"/>    
3. </bean>   

当然了动态加载的bean也可以reference 到原始的context中的bean.比如magazineDao就是在data-access-config.xml中配置的一个bean.

本文转自：http://elicer.iteye.com/blog/438026