diff --git a/jero-boot-module-system/src/main/java/com/jero/modules/system/controller/CommonController.java b/jero-boot-module-system/src/main/java/com/jero/modules/system/controller/CommonController.java
index d7ad456a..3903d437 100644
--- a/jero-boot-module-system/src/main/java/com/jero/modules/system/controller/CommonController.java
+++ b/jero-boot-module-system/src/main/java/com/jero/modules/system/controller/CommonController.java
@@ -12,6 +12,7 @@ import lombok.extern.slf4j.Slf4j;
 import com.jero.common.api.vo.Result;
 import com.jero.common.constant.CommonConstant;
 import com.jero.common.system.api.ISysBaseAPI;
+import org.apache.commons.lang3.StringUtils;
 import org.apache.shiro.SecurityUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
@@ -170,7 +171,10 @@ public class CommonController {
             response.addHeader("Content-Disposition", "attachment;fileName=" + new String(fileName.getBytes("UTF-8"),"iso-8859-1"));
             response.setContentType("application/force-download");// 设置强制下载不打开
             if (type == null) {
-                if (fileName.contains(".jpg") || fileName.contains(".png") || fileName.contains(".gif") || fileName.contains(".jpeg")) {
+                fileName = StringUtils.lowerCase(fileName);
+                if (fileName.contains(".jpg") || fileName.contains(".gif") || fileName.contains(".jpeg")) {
+                    response.setContentType("image/jpeg;image/jpg;image/gif;image/png");
+                } else if (fileName.contains(".png")) {
                     response.setContentType("image/png;image/jpg;image/gif;image/jpeg");
                 }
             }
@@ -279,7 +283,10 @@ public class CommonController {
             response.addHeader("Content-Disposition", "attachment;fileName=" + new String(fileName.getBytes("UTF-8"),"iso-8859-1"));
             response.setContentType("application/force-download");// 设置强制下载不打开
             if (type == null) {
-                if (fileName.contains(".jpg") || fileName.contains(".png") || fileName.contains(".gif") || fileName.contains(".jpeg")) {
+                fileName = StringUtils.lowerCase(fileName);
+                if (fileName.contains(".jpg") || fileName.contains(".gif") || fileName.contains(".jpeg")) {
+                    response.setContentType("image/jpeg;image/jpg;image/gif;image/png");
+                } else if (fileName.contains(".png")) {
                     response.setContentType("image/png;image/jpg;image/gif;image/jpeg");
                 }
             }