普通java类调用spring中的bean

public class Common  {
    private UserService userService;   
    public Common() {
        @SuppressWarnings("resource")
        AbstractApplicationContext ctx 
            = new ClassPathXmlApplicationContext(new String []{"classpath:spring-mvc.xml","classpath:spring-mybatis.xml"});
        userService = (UserService) ctx.getBean("userService");
    } 
}