spring bean的获取方式

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private static Demo demo = ((Demo)SpringContextHolder.getBean("demo"));/** * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候取出ApplicaitonContext. *  */@Service@Lazy(false)public class SpringContextHolder implements ApplicationContextAware, DisposableBean {    private static ApplicationContext applicationContext = null;    private static Logger logger = LoggerFactory.getLogger(SpringContextHolder.class);    /**     * 取得存储在静态变量中的ApplicationContext.     */    public static ApplicationContext getApplicationContext() {        assertContextInjected();        return applicationContext;    }    /**     * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.     */    @SuppressWarnings("unchecked")    public static <T> T getBean(String name) {        assertContextInjected();        return (T) applicationContext.getBean(name);    }    /**     * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.     */    public static <T> T getBean(Class<T> requiredType) {        assertContextInjected();        return applicationContext.getBean(requiredType);    }    /**     * 清除SpringContextHolder中的ApplicationContext为Null.     */    public static void clearHolder() {        if (logger.isDebugEnabled()){            logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);        }        applicationContext = null;    }    /**     * 实现ApplicationContextAware接口, 注入Context到静态变量中.     */    @Override    public void setApplicationContext(ApplicationContext applicationContext) {        SpringContextHolder.applicationContext = applicationContext;    }    /**     * 实现DisposableBean接口, 在Context关闭时清理静态变量.     */    @Override    public void destroy() throws Exception {        SpringContextHolder.clearHolder();    }    /**     * 检查ApplicationContext不为空.     */    private static void assertContextInjected() {        Validate.validState(applicationContext != null, "applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.");    }}
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