动态加载 bean 到Spring Context(转)

动态Bean的实现类
Java代码  收藏代码

    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
Java代码  收藏代码

    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

Java代码  收藏代码

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



动态加载的bean的配置文件

Java代码  收藏代码

    <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.