Spring加载配置信息
constant.properties

public class Test {public static void main(String[] args) {ApplicationContext context = new ClassPathXmlApplicationContext(        new String[] {"spring/applicationContext.xml"});TTinterface  tt=(TTinterface)context.getBean("t");Constant  constant = (Constant) context.getBean("constant");System.out.println(Constant.getProperties("xx"));System.out.println(Constant.getProperties("xxxxx"));}