1. import org.apache.commons.lang3.Validate;
    2. import org.springframework.beans.factory.DisposableBean;
    3. import org.springframework.context.ApplicationContext;
    4. import org.springframework.context.ApplicationContextAware;
    5. import org.springframework.context.annotation.Lazy;
    6. import org.springframework.stereotype.Service;
    8. @Service
    9. @Lazy(false)
    10. public class SpringContextHolder implements ApplicationContextAware, DisposableBean {
    11.     private static ApplicationContext applicationContext = null;
    13.     /**
    14.      * 取得存储在静态变量中的ApplicationContext.
    15.      */
    16.     public static ApplicationContext getApplicationContext() {
    17.         assertContextInjected();
    18.         return applicationContext;
    19.     }
    21.     /**
    22.      * 通过name获取 Bean
    23.      * @param name 类名称
    24.      * @return 实例对象
    25.      */
    26.     public static Object getBean(String name){
    27.         return getApplicationContext().getBean(name);
    28.     }
    30.     /**
    31.      * 通过class获取Bean
    32.      */
    33.     public static <T> T getBean(Class<T> clazz){
    34.         return getApplicationContext().getBean(clazz);
    35.     }
    37.     /**
    38.      * 通过name,以及Clazz返回指定的Bean
    39.      */
    40.     public static <T> T getBean(String name,Class<T> clazz){
    41.         return getApplicationContext().getBean(name, clazz);
    42.     }
    44.     /**
    45.      * 清除SpringContextHolder中的ApplicationContext为Null.
    46.      */
    47.     public static void clearHolder() {
    48.         applicationContext = null;
    49.     }
    51.     /**
    52.      * 实现ApplicationContextAware接口, 注入Context到静态变量中.
    53.      */
    54.     @Override
    55.     public void setApplicationContext(ApplicationContext appContext) {
    56.         applicationContext = appContext;
    57.     }
    59.     /**
    60.      * 实现DisposableBean接口, 在Context关闭时清理静态变量.
    61.      */
    62.     @Override
    63.     public void destroy() throws Exception {
    64.         SpringContextHolder.clearHolder();
    65.     }
    67.     /**
    68.      * 检查ApplicationContext不为空.
    69.      */
    70.     private static void assertContextInjected() {
    71.         Validate.validState(applicationContext != null, "applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.");
    72.     }
    73. }