Spring（一）解决XmlBeanFactory过时问题

小灰灰 2022-05-29 05:00 114阅读 0赞

The type XmlBeanFactory is deprecated，XmlBeanFactory在3.1以后已经被废弃，不再推荐使用

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

解决方案：

1、在不改变处理逻辑的基础上，改为

Resource resource=new ClassPathResource("applicationContext.xml");  
    BeanFactory factory=new DefaultListableBeanFactory();  
    BeanDefinitionReader bdr=new XmlBeanDefinitionReader((BeanDefinitionRegistry) factory1);  
    bdr.loadBeanDefinitions(resource);

BeanFactory在启动的时候，不会创建bean的实例，而是在getBean()的时候，才会创建Bean的实例

factory.getBean("beanClass");

2、使用ApplicationContext

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

ApplicationContext在读取配置文件的时候，配置文件中的bean就会被实例化（不考虑bean的作用域）

上代码

BeanClass.java文件

package bean;
    
    public class BeanClass {
    	public BeanClass(){
    		super();
    		System.out.println("BeanClass被实例化");
    	}
    }

Test.java文件

package Test;
    
    import org.springframework.beans.factory.BeanFactory;
    import org.springframework.beans.factory.support.BeanDefinitionReader;
    import org.springframework.beans.factory.support.BeanDefinitionRegistry;
    import org.springframework.beans.factory.support.DefaultListableBeanFactory;
    import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
    import org.springframework.beans.factory.xml.XmlBeanFactory;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    import org.springframework.core.io.ClassPathResource;
    import org.springframework.core.io.Resource;
    
    public class Test {
    	public static void main(String[] args) {
    		ApplicationContext sc = new ClassPathXmlApplicationContext("applicationContext.xml");
    		
    		Resource resource=new ClassPathResource("applicationContext.xml");  
    		BeanFactory fa=new DefaultListableBeanFactory();  
    		BeanDefinitionReader bdr=new XmlBeanDefinitionReader((BeanDefinitionRegistry) fa);  
    		bdr.loadBeanDefinitions(resource); 
     	}
    }

Spring配置文件

<?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-4.0.xsd">
        <bean id="beanClass" class="bean.BeanClass"></bean>
    </beans>

运行Test.java文件

三月 17, 2018 4:04:07 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
    信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@4d76f3f8: startup date [Sat Mar 17 16:04:07 CST 2018]; root of context hierarchy
    三月 17, 2018 4:04:07 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
    信息: Loading XML bean definitions from class path resource [applicationContext.xml]
    BeanClass被实例化
    三月 17, 2018 4:04:08 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
    信息: Loading XML bean definitions from class path resource [applicationContext.xml]
    BeanClass被实例化