常用开源框架中设计模式使用分析-工厂模式（Factory Pattern）

@Test
public void testBeanFactoy() throws NamingException, SQLException, ParseException, IOException {

    //创建Bean工厂
    DefaultListableBeanFactory bf = new DefaultListableBeanFactory();

    //给bean工厂添加bean定义,解析xml里面的bean放入bean工厂
    loadBeanDefinitions(bf);

    //根据名字从bean工厂获取bean
    Hello hello = (Hello) bf.getBean("hello");
    hello.sayHello();
    
    Hello2 hello2 = (Hello2) bf.getBean("hello2");
    hello2.sayHello();
    

}

protected void loadBeanDefinitions(DefaultListableBeanFactory beanFactory) throws IOException {
    XmlBeanDefinitionReader beanDefinitionReader = new XmlBeanDefinitionReader(beanFactory);

    String[] configLocations = new String[] { "beans2.xml" };
    if (configLocations != null) {
        beanDefinitionReader.loadBeanDefinitions(configLocations);
    }
}