How to use DefaultListableBeanFactory in Spring?

2 years ago
Liam
2 minutes

In Spring, DefaultListableBeanFactory is a default implementation of the BeanFactory interface, offering a flexible way to implement a BeanFactory. It allows for registering Bean definitions through reading configuration files or programmatically, and manages dependencies between Beans.

These are the steps to use DefaultListableBeanFactory:

  1. Instantiate a DefaultListableBeanFactory object.
  2. Create a DefaultListableBeanFactory named beanFactory.
  3. Bean definitions can be registered programmatically or through reading configuration files.
  4. a. Bean definitions can be registered programmatically.
  5. Create a new instance of GenericBeanDefinition and assign it to the variable beanDefinition. Set the bean class to YourBeanClass and register the bean definition with the name “yourBeanName” in the beanFactory.
  6. b. Reading configuration files to register Bean definitions:
  7. Create a new XmlBeanDefinitionReader object, passing in a beanFactory, and then load bean definitions from a file named “your-config.xml” within the specified classpath.
  8. Obtain Bean instances:
    You can obtain Bean instances by using the getBean method of the beanFactory, by providing the name or type of the Bean.
  9. Create an instance of YourBeanClass using the beanFactory with the name “yourBeanName”.
  10. Use the Bean instance:
  11. Perform an action on the bean.

Please note:

  1. When registering Bean definitions, it is necessary to specify the name of the Bean and its corresponding BeanDefinition, with the Bean name being unique within the container.
  2. When obtaining a Bean instance through the getBean method, if the type of the Bean is not unique, you can specify it either by its name or by its type.

I hope this helps you!

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