Spring中的BeanFactory和ApplicationContext的区别-编程知识

Spring中的BeanFactory和ApplicationContext的区别

我用一个例子去测试BeanFactory和ApplicationContext的区别

首先建立一个bean

public class User { //声明无参构造，打印一句话，监测对象创建时机public User(){System.out.println("User对象初始化");}
}

然后再建立测试类

ublic class UserTest {@Testpublic void ApplicationContexttest(){ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");}@Testpublic void BeanFactorytest(){Resource resource=new PathResource("applicationContext.xml");BeanFactory beanFactory=new XmlBeanFactory(resource);}
}

配置xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd "><bean name="user" class="bean.entity.User"></bean></beans>

执行 ApplicationContexttest()方法

结果：

说明user对象在ApplicationContext对象创建时user对象就已经初始化

执行BeanFactorytest()方法

结果：

BeanFactory对象初始化时并没有初始化user对象

然后向两个方法添加获取对象的代码

public class UserTest {@Testpublic void ApplicationContexttest(){ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");System.out.println(context.getBean("user"));System.out.println(context.getBean("user"));}@Testpublic void BeanFactorytest(){Resource resource=new ClassPathResource("applicationContext.xml");BeanFactory beanFactory=new XmlBeanFactory(resource);System.out.println(beanFactory.getBean("user"));System.out.println(beanFactory.getBean("user"));}
}

执行 ApplicationContexttest()方法

结果：