🔨 重构代码, 优化目录结构

src/main/java/im/zhaojun/zfile/util/SpringContextHolder.java

@@ -0,0 +1,70 @@
+package im.zhaojun.zfile.util;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.DisposableBean;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.context.annotation.Lazy;
+import org.springframework.lang.NonNull;
+import org.springframework.stereotype.Service;
+
+/**
+ * @author zhaojun
+ */
+@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() {
+        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) {
+        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) {
+        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);
+        }
+        logger.info("清除SpringContextHolder中的ApplicationContext:" + applicationContext);
+        applicationContext = null;
+    }
+
+    /**
+     * 实现 DisposableBean 接口, 在 Context 关闭时清理静态变量.
+     */
+    @Override
+    public void destroy() {
+        SpringContextHolder.clearHolder();
+    }
+
+    @Override
+    public void setApplicationContext(@NonNull ApplicationContext applicationContext) throws BeansException {
+        SpringContextHolder.applicationContext = applicationContext;
+    }
+
+}