diff --git a/server/src/main/java/cn/keking/utils/DownloadUtils.java b/server/src/main/java/cn/keking/utils/DownloadUtils.java
index 1ba05cff..4c9c0350 100644
--- a/server/src/main/java/cn/keking/utils/DownloadUtils.java
+++ b/server/src/main/java/cn/keking/utils/DownloadUtils.java
@@ -4,7 +4,6 @@ import cn.keking.config.ConfigConstants;
 import cn.keking.model.FileAttribute;
 import cn.keking.model.ReturnResponse;
 import io.mola.galimatias.GalimatiasParseException;
-import jodd.io.FileUtil;
 import jodd.io.NetUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
diff --git a/server/src/main/java/cn/keking/web/controller/OnlinePreviewController.java b/server/src/main/java/cn/keking/web/controller/OnlinePreviewController.java
index 5d6c644d..7309db76 100644
--- a/server/src/main/java/cn/keking/web/controller/OnlinePreviewController.java
+++ b/server/src/main/java/cn/keking/web/controller/OnlinePreviewController.java
@@ -25,6 +25,7 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.*;
 import java.net.URL;
+import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.List;
 
@@ -55,7 +56,7 @@ public class OnlinePreviewController {
     public String onlinePreview(String url, Model model, HttpServletRequest req) {
         String fileUrl;
         try {
-            fileUrl = new String(Base64.decodeBase64(url));
+            fileUrl = new String(Base64.decodeBase64(url), StandardCharsets.UTF_8);
         } catch (Exception ex) {
             String errorMsg = String.format(BASE64_DECODE_ERROR_MSG, "url");
             return otherFilePreview.notSupportedFile(model, errorMsg);