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;
  }
}