通过ApplicationContextAware获取spring容器中的bean

通过ApplicationContextAware获取spring容器中的bean import java.util.Map;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;/ * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候中取出ApplicaitonContext. * * @author zhuh * @version 1.0 * @created 2011-9-19 上午10:14:10 * @history * @see/public class SpringContextHolder implements ApplicationContextAware{    private static ApplicationContext applicationContext;    /     * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量.     /    public void setApplicationContext(ApplicationContext applicationContext) {        SpringContextHolder.applicationContext = applicationContext;    }    /     * 取得存储在静态变量中的ApplicationContext.     /    public static ApplicationContext getApplicationContext() {        checkApplicationContext();        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) {        checkApplicationContext();        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.     * 如果有多个Bean符合Class, 取出第一个.     /    @SuppressWarnings("unchecked")    public static <T> T getBean(Class<T> clazz) {        checkApplicationContext();        Map beanMaps = applicationContext.getBeansOfType(clazz);        if (beanMaps!=null && !beanMaps.isEmpty()) {            return (T) beanMaps.values().iterator().next();        } else{            return null;        }    }    private static void checkApplicationContext() {        if (applicationContext == null) {            throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextHolder");        }    }}