Spring基础学习之xml文件形式装配获取bean对象

  
        org.springframework
        spring-context
        5.3.20
    

获取文件头：Core Technologies

访问官网路径进行复制，这里已经帮你整理好了

文件全部内容：

public class Client {
    
    
 * 核心容器的接口引发出的问题：
     * ApplicationContext:   单例对象适用  (常用)
     * 它在创建容器时，创建对象采取的策略是采用立即加载的方式，也就是说，只要一读取完配置文件马上就创建配置文件中配置的对象。
     * BeanFactory:         多例对象适用
     * 它在创建容器时，创建对象采取的策略是采用延迟加载的方式。也就是说，什么时候根据id获取对象了，什么时候才真正的创建对象。

    public static void main(String[] args) {

        //第一种加载方式：加载类任意路径下的配置文件
        System.out.println("第一种加载方式：加载类任意路径下的配置文件");
        ApplicationContext applicationContext = new FileSystemXmlApplicationContext("E:\Demo\demo02\demo01\src\main\resources\bean.xml");
        //根据id获取Bean对象
        AccountDao accountDao = (AccountDao) applicationContext.getBean("AccountDao");
        //  //.class获取AccountDao对象
        AccountDao accountDaoClass = applicationContext.getBean("AccountDao", AccountDao.class);
        IAccountService iAccountService = (IAccountService) applicationContext.getBean("IAccountService");
        System.out.println("AccountDao=" + accountDao + "n" + "IAccountService=" + iAccountService + "n" + "accountDaoClass=" + accountDaoClass);

        System.out.println("第二种加载方式：加载类路径下的配置文件");
        //第二种加载方式：加载类路径下的配置文件
        ApplicationContext applicationContext1 = new ClassPathXmlApplicationContext("bean.xml");
        //根据id获取Bean对象
        AccountDao accountDao1 = (AccountDao) applicationContext1.getBean("AccountDao");
        IAccountService iAccountService1 = (IAccountService) applicationContext.getBean("IAccountService");
        //.class获取IAccountService对象
        IAccountService IAccountServiceClass = applicationContext1.getBean("IAccountService", IAccountService.class);
        System.out.println("AccountDao1=" + accountDao1 + "n" + "iAccountService1=" + iAccountService1 + "n" + "IAccountServiceClass=" + IAccountServiceClass);




     System.out.println("--------------BeanFactory----------------");
        Resource resource = new ClassPathResource("bean.xml");
        BeanFactory beanFactory = new XmlBeanFactory(resource);
        IAccountService iAccountService = (IAccountService) beanFactory.getBean("IAccountService");
        System.out.println(iAccountService);

    }
}

到这里bean.xml文件装配bean获取对象到此完成，看看运行结果：