容器

1. 创建容器

1.1 (推荐)加载类路径下的配置文件

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

1.2 从文件系统下加载配置文件

ApplicationContext ctx = new FileSystemXmlApplicationContext("D:\workspace\spring\spring_10_container\src\main\resources\applicationContext.xml");

总结

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2. 获取bean

2.1 强制转化

    BookDao bookDao = (BookDao) ctx.getBean("bookDao");

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2.2 将强制转换环节改为参数传入

BookDao bookDao = ctx.getBean("bookDao",BookDao.class);

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2.3 按类型找bean

 BookDao bookDao = ctx.getBean(BookDao.class);

总结

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3. 容器类层次结构

4. BeanFactory

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