Spring中BeanFactory和ApplicationContext的区别 _Application

壮心未与年俱老，死去犹能作鬼雄。这篇文章主要讲述Spring中BeanFactory和ApplicationContext的区别相关的知识，希望能为你提供帮助。
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

public class UserTest { @Test public void ApplicationContexttest(){ ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml"); } @Test public 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/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://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：

Spring中BeanFactory和ApplicationContext的区别

文章图片

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：

文章图片

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 { @Test public void ApplicationContexttest(){ ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml"); System.out.println(context.getBean("user")); System.out.println(context.getBean("user")); } @Test public 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：