spring占位符解析器---PropertyPlaceholderHelper

public class PropertyPlaceholderHelperDemo {

    @SuppressWarnings("resource")
    public static void main(String[] args) {
        Properties properties = System.getProperties();
        
        properties.setProperty("prefixName", "read-code");
        
        ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:${prefixName}-spring.xml");
        
        ReadCodeService readCodeService = (ReadCodeService) ac.getBean("readCodeService");
        
        readCodeService.say();
    }
}