动态加载 bean 到Spring Context

动态Bean的实现类

import java.io.IOException;   
  
import org.springframework.beans.BeansException;   
import org.springframework.beans.factory.support.BeanDefinitionRegistry;   
import org.springframework.beans.factory.xml.ResourceEntityResolver;   
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;   
import org.springframework.context.ApplicationContext;   
import org.springframework.context.ApplicationContextAware;   
import org.springframework.context.ConfigurableApplicationContext;   
  
/**  
 *   
 * This class used to dynamic loan bean to spring context during runtime  
 *   
 *  
 */  
public class DynamicLoadBean implements ApplicationContextAware{   
  
    private ConfigurableApplicationContext applicationContext = null;   
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {   
        this.applicationContext = (ConfigurableApplicationContext)applicationContext;   
    }   
    public ConfigurableApplicationContext getApplicationContext() {   
        return applicationContext;   
    }   
       
    /**  
     * 向spring的beanFactory动态地装载bean  
     * @param configLocationString 要装载的bean所在的xml配置文件位置。  
spring配置中的contextConfigLocation，同样支持诸如"/WEB-INF/ApplicationContext-*.xml"的写法。  
     */  
    public void loadBean(String configLocationString){   
        XmlBeanDefinitionReader beanDefinitionReader = new XmlBeanDefinitionReader((BeanDefinitionRegistry)getApplicationContext().getBeanFactory());   
        beanDefinitionReader.setResourceLoader(getApplicationContext());   
        beanDefinitionReader.setEntityResolver(new ResourceEntityResolver(getApplicationContext()));   
        try {   
            String[] configLocations = new String[]{configLocationString};   
            for(int i=0;i<configLocations.length;i++)   
                beanDefinitionReader.loadBeanDefinitions(getApplicationContext().getResources(configLocations[i]));   
        } catch (BeansException e) {   
            // TODO Auto-generated catch block   
            e.printStackTrace();   
        } catch (IOException e) {   
            // TODO Auto-generated catch block   
            e.printStackTrace();   
        }   
    }   
}  

测试类如下

ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:data-access-config.xml");      
        DynamicLoadBean dynamicBeanLoad =(DynamicLoadBean)ctx.getBean("dynamicLoadBean");   
  
dynamicBeanLoad.loadBean("data-access-dynamicConfig.xml");   
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

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

动态加载的bean的配置文件

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

http://elicer.iteye.com/blog/438026