How to get Property from Spring Context in a pojo not managed by spring?

问题

I have a property file that is configured within spring context xml file. I load values from the file fine. I am trying to load a property from that property file in a regular pojo which is not spring managed. Since Spring has already loaded that property, i was wondering if there is a way to get the value instead of me having to load the property file manually?

回答1:

You can access the Spring context in a static way if your pojo is not managed by Spring.

Add a bean to your application xml:

<bean id="StaticSpringApplicationContext" class="com.package.StaticSpringApplicationContext"/>

Create a class:

public class StaticSpringApplicationContext implements ApplicationContextAware  {
    private static ApplicationContext CONTEXT;

      public void setApplicationContext(ApplicationContext context) throws BeansException {
        CONTEXT = context;
      }

      public static Object getBean(String beanName) {
        return CONTEXT.getBean(beanName);
      }

}

Then you can acces any Spring bean from your POJO using:

StaticSpringApplicationContext.getBean("yourBean")

回答2:

For a more modern approach, that uses annotations and implements generics you can use this version, build upon Wickramarachi response:

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class StaticSpringApplicationContext implements ApplicationContextAware {
    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        StaticSpringApplicationContext.applicationContext = applicationContext;
    }

    public static <T> T getBean(Class<T> requiredType) {
        return applicationContext.getBean(requiredType);
    }

    public static <T> T getBean(String beanName, Class<T> requiredType) {
        return applicationContext.getBean(beanName, requiredType);
    }

}

Usage is as follow:

SpringJPAPersistenceChannel bean = StaticSpringApplicationContext.getBean(MyBean.class);

来源：https://stackoverflow.com/questions/13631052/how-to-get-property-from-spring-context-in-a-pojo-not-managed-by-spring

标签

Spring

properties

pojo