diff --git a/austin-common/src/main/java/com/java3y/austin/common/vo/BasicResultVO.java b/austin-common/src/main/java/com/java3y/austin/common/vo/BasicResultVO.java
index ab21633..7840ee9 100644
--- a/austin-common/src/main/java/com/java3y/austin/common/vo/BasicResultVO.java
+++ b/austin-common/src/main/java/com/java3y/austin/common/vo/BasicResultVO.java
@@ -6,6 +6,8 @@ import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.ToString;
 
+import java.io.Serializable;
+
 /**
  * @author zzb
  * @since 2021.11.17
@@ -15,7 +17,7 @@ import lombok.ToString;
 @ToString(callSuper = true)
 @AllArgsConstructor
 @NoArgsConstructor
-public final class BasicResultVO<T> {
+public final class BasicResultVO<T> implements Serializable {
 
     /**
      * 响应状态
diff --git a/austin-handler/src/main/java/com/java3y/austin/handler/handler/impl/SmsHandler.java b/austin-handler/src/main/java/com/java3y/austin/handler/handler/impl/SmsHandler.java
index 00b7b2f..ee0369f 100644
--- a/austin-handler/src/main/java/com/java3y/austin/handler/handler/impl/SmsHandler.java
+++ b/austin-handler/src/main/java/com/java3y/austin/handler/handler/impl/SmsHandler.java
@@ -24,10 +24,10 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.ApplicationContext;
 import org.springframework.stereotype.Component;
 
+import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-import java.util.Random;
 
 /**
  * 短信发送处理
@@ -44,6 +44,11 @@ public class SmsHandler extends BaseHandler{
     private static final Integer AUTO_FLOW_RULE = 0;
     private static final String FLOW_KEY = "msgTypeSmsConfig";
     private static final String FLOW_KEY_PREFIX = "message_type_";
+    /**
+     * 安全随机数，重用性能与随机数质量更高
+     */
+    private static final SecureRandom secureRandom = new SecureRandom();
+
     @Autowired
     private SmsRecordDao smsRecordDao;
     @Autowired
@@ -99,7 +104,7 @@ public class SmsHandler extends BaseHandler{
         }
 
         // 生成一个随机数[1,total]，看落到哪个区间
-        int index = new Random().nextInt(total) + 1;
+        int index = secureRandom.nextInt(total) + 1;
 
         MessageTypeSmsConfig supplier = null;
         MessageTypeSmsConfig supplierBack = null;
diff --git a/austin-support/src/main/java/com/java3y/austin/support/utils/AustinFileUtils.java b/austin-support/src/main/java/com/java3y/austin/support/utils/AustinFileUtils.java
index a366a62..1129807 100644
--- a/austin-support/src/main/java/com/java3y/austin/support/utils/AustinFileUtils.java
+++ b/austin-support/src/main/java/com/java3y/austin/support/utils/AustinFileUtils.java
@@ -33,7 +33,6 @@ public class AustinFileUtils {
      * @return
      */
     public static File getRemoteUrl2File(String path, String remoteUrl) {
-
         InputStream inputStream = null;
         FileOutputStream fileOutputStream = null;
         try {
@@ -41,7 +40,11 @@ public class AustinFileUtils {
             File file = new File(path, url.getPath());
             inputStream = url.openStream();
             if (!file.exists()) {
-                file.getParentFile().mkdirs();
+                boolean res = file.getParentFile().mkdirs();
+                if (!res) {
+                    log.error("AustinFileUtils#getRemoteUrl2File Failed to create folder, path:{}, remoteUrl:{}", path, remoteUrl);
+                    return null;
+                }
                 fileOutputStream = new FileOutputStream(file);
                 IoUtil.copy(inputStream, fileOutputStream);
             }
@@ -49,20 +52,8 @@ public class AustinFileUtils {
         } catch (Exception e) {
             log.error("AustinFileUtils#getRemoteUrl2File fail:{},remoteUrl:{}", Throwables.getStackTraceAsString(e), remoteUrl);
         } finally {
-            if (Objects.nonNull(inputStream)) {
-                try {
-                    inputStream.close();
-                } catch (IOException e) {
-                    log.error("close#inputStream fail:{}", Throwables.getStackTraceAsString(e));
-                }
-            }
-            if (Objects.nonNull(fileOutputStream)) {
-                try {
-                    fileOutputStream.close();
-                } catch (IOException e) {
-                    log.error("close#fileOutputStream fail:{}", Throwables.getStackTraceAsString(e));
-                }
-            }
+            closeQuietly(inputStream);
+            closeQuietly(fileOutputStream);
         }
         return null;
     }
@@ -85,4 +76,33 @@ public class AustinFileUtils {
         return files;
     }
 
+    /**
+     * 关闭InputStream流
+     *
+     * @param inputStream
+     */
+    private static void closeQuietly(InputStream inputStream) {
+        if (Objects.nonNull(inputStream)) {
+            try {
+                inputStream.close();
+            } catch (IOException e) {
+                log.error("close#inputStream fail:{}", Throwables.getStackTraceAsString(e));
+            }
+        }
+    }
+
+    /**
+     * 关闭FileOutputStream流
+     *
+     * @param fileOutputStream
+     */
+    private static void closeQuietly(FileOutputStream fileOutputStream) {
+        if (Objects.nonNull(fileOutputStream)) {
+            try {
+                fileOutputStream.close();
+            } catch (IOException e) {
+                log.error("close#fileOutputStream fail:{}", Throwables.getStackTraceAsString(e));
+            }
+        }
+    }
 }
diff --git a/austin-web/src/main/java/com/java3y/austin/web/controller/MessageTemplateController.java b/austin-web/src/main/java/com/java3y/austin/web/controller/MessageTemplateController.java
index aab3477..ea62a21 100644
--- a/austin-web/src/main/java/com/java3y/austin/web/controller/MessageTemplateController.java
+++ b/austin-web/src/main/java/com/java3y/austin/web/controller/MessageTemplateController.java
@@ -201,7 +201,11 @@ public class MessageTemplateController {
         try {
             File localFile = new File(filePath);
             if (!localFile.exists()) {
-                localFile.mkdirs();
+                boolean res = localFile.mkdirs();
+                if (!res) {
+                    log.error("MessageTemplateController#upload fail! Failed to create folder.");
+                    throw new CommonException(RespStatusEnum.SERVICE_ERROR);
+                }
             }
             file.transferTo(localFile);
         } catch (Exception e) {