Spring创建IOC容器的方式解析

ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");

public class ApplicationContextUtil {  private static ApplicationContext applicationContext = null;  public ApplicationContextUtil(){     //无参构造器，可以不用写  }    static{    applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");  }    public ApplicationContext getApplicationContext() {    return applicationContext;  }

 Resource resource = new ClassPathResource("applicationContext.xml"); BeanFactory factory = new XmlBeanFactory(resource);

public class ApplicationContextFactoryUtil {  private static BeanFactory beanFactory = null;  public ApplicationContextFactoryUtil(){      }    static{    Resource resource = new ClassPathResource("applicationContext.xml");    beanFactory = new XmlBeanFactory(resource);  }    public BeanFactory getBeanFactory() {    return beanFactory;  }}