diff --git a/shandan-common/src/main/java/com/keyware/shandan/common/util/FileDownload.java b/shandan-common/src/main/java/com/keyware/shandan/common/util/FileDownload.java
index 9294f65..39ec53b 100644
--- a/shandan-common/src/main/java/com/keyware/shandan/common/util/FileDownload.java
+++ b/shandan-common/src/main/java/com/keyware/shandan/common/util/FileDownload.java
@@ -58,7 +58,7 @@ public class FileDownload {
         response.reset();
         response.setContentType("application/octet-stream");
         response.setCharacterEncoding("utf-8");
-        response.setContentLength((int) file.length());
+        response.setContentLengthLong(file.length());
 
         if (!StringUtils.hasText(fileName)) {
             fileName = file.getName();