java - 关于spring容器热切单例设计模式

Question

我已经为spring开发了一个实用类，它是一个单例，它将为整个应用程序提供容器的引用，下面是我的类..

public class SpringUtility 
{
    private static BeanFactory factory ;
    static
    {try
        {BeanFactory factory = new XmlBeanFactory(new FileSystemResource("Spring.xml"));
        }   catch(Exception e) 
        {
            e.printStackTrace();
        }
    }

    private SpringUtility() 
    {}

    public static BeanFactory getBeanFactory()
    {       return factory;
    }}

现在请告知我想将其转换为急切的单例样式，请告知如何实现。请告知如何将同一个类转换为急切的单例设计模式，例如正常的急切设计模式是..

public class SingletonEager {

    private final static SingletonEager INSTANCE = new SingletonEager();

    private SingletonEager() {
    }

    public static SingletonEager getInstance() {
        return SingletonEager.INSTANCE;
    }

    protected Object clone() throws CloneNotSupportedException {
        throw new CloneNotSupportedException();
    }
}

类似的方法我也想要 Spring 的，请指教

Answer 1

如果你想让 BeanFactory 从 Spring 上下文中获取 beans，那么我建议你实现 BeanFactoryAware , 它将保持单例并急切加载

public class BeanManager implements BeanFactoryAware {

  private BeanFactory beanFactory;

  public Person getPerson(){ beanFactory.getBean(Person.class) ;}   

}

并将这个BeanManager类标记为spring bean