我們經常會在工作中需要獲取Spring上下文信息，來獲取程序中的一些要素，以下就是一個簡單的獲取Spring上下文的簡單實現。

public class SpringContextHolder implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    public void setApplicationContext(ApplicationContext applicationContext) {
        SpringContextHolder.applicationContext = applicationContext;
    }

    /**
     * 得到Spring 上下文環境
     * 
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        checkApplicationContext();
        return applicationContext;
    }

    /**
     * 通過Spring Bean name 得到Bean
     * 
     * @param name bean 上下文定義名稱
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) {
        checkApplicationContext();
        return (T) applicationContext.getBean(name);
    }

    /**
     * 通過類型得到Bean
     * 
     * @param clazz
     * @return
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(Class<T> clazz) {
        checkApplicationContext();
        return (T) applicationContext.getBeansOfType(clazz);
    }

    private static void checkApplicationContext() {
        if (applicationContext == null) {
            throw new IllegalStateException("applicaitonContext未註入,請在application-context.xml中定義SpringContextHolder");
        }
    }

}
 

public abstract interface ApplicationContextAware extends Aware {
    public abstract void setApplicationContext(
            ApplicationContext paramApplicationContext) throws BeansException;
}

public abstract interface Aware {
}

Spring上下文信息獲取簡單實現