管理员上传文件到存储桶功能基本完成；可以前端计算文件SHA1；添加腾讯云生成SecretId、SecretKey文档

bookshelfplus/src/main/java/plus/bookshelf/AppListener.java

@@ -0,0 +1,23 @@
+package plus.bookshelf;
+
+import org.springframework.beans.factory.DisposableBean;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+import plus.bookshelf.Common.FileManager.QCloudCosUtils;
+
+@Component
+public class AppListener implements CommandLineRunner, DisposableBean {
+    //应用启动成功后的回调
+    @Override
+    public void run(String... args) throws Exception {
+        System.out.println("prepare to start ...");
+    }
+
+    //应用启动关闭前的回调
+    @Override
+    public void destroy() throws Exception {
+        System.out.println("prepare to close ...");
+        QCloudCosUtils.destoryInstance();
+        System.out.println("close success ...");
+    }
+}