diff --git a/server/src/main/java/cn/keking/service/impl/CadFilePreviewImpl.java b/server/src/main/java/cn/keking/service/impl/CadFilePreviewImpl.java
index 42b9c1a5..9a71cb2a 100644
--- a/server/src/main/java/cn/keking/service/impl/CadFilePreviewImpl.java
+++ b/server/src/main/java/cn/keking/service/impl/CadFilePreviewImpl.java
@@ -40,7 +40,8 @@ public class CadFilePreviewImpl implements FilePreview {
         String baseUrl = BaseUrlFilter.getBaseUrl();
         boolean forceUpdatedCache=fileAttribute.forceUpdatedCache();
         String fileName = fileAttribute.getName();
-        String pdfName = fileName.substring(0, fileName.lastIndexOf(".") + 1) + "pdf";
+        String suffix = fileAttribute.getSuffix();
+        String pdfName = fileName.substring(0, fileName.lastIndexOf(".")) + suffix +"." + "pdf" ; //生成文件添加类型后缀 防止同名文件
         String outFilePath = FILE_DIR + pdfName;
         // 判断之前是否已转换过，如果转换过，直接返回，否则执行转换
         if (forceUpdatedCache || !fileHandlerService.listConvertedFiles().containsKey(pdfName) || !ConfigConstants.isCacheEnabled()) {
diff --git a/server/src/main/java/cn/keking/service/impl/OfficeFilePreviewImpl.java b/server/src/main/java/cn/keking/service/impl/OfficeFilePreviewImpl.java
index 1ff9dfcc..f2d81f64 100644
--- a/server/src/main/java/cn/keking/service/impl/OfficeFilePreviewImpl.java
+++ b/server/src/main/java/cn/keking/service/impl/OfficeFilePreviewImpl.java
@@ -49,8 +49,8 @@ public class OfficeFilePreviewImpl implements FilePreview {
         String filePassword = fileAttribute.getFilePassword();
         boolean forceUpdatedCache=fileAttribute.forceUpdatedCache();
         String userToken = fileAttribute.getUserToken();
-         boolean isHtml = suffix.equalsIgnoreCase("xls") || suffix.equalsIgnoreCase("xlsx") || suffix.equalsIgnoreCase("csv") || suffix.equalsIgnoreCase("xlsm") || suffix.equalsIgnoreCase("xlt") || suffix.equalsIgnoreCase("xltm") || suffix.equalsIgnoreCase("et") || suffix.equalsIgnoreCase("ett") || suffix.equalsIgnoreCase("xlam");
-        String pdfName = fileName.substring(0, fileName.lastIndexOf(".") + 1) + (isHtml ? "html" : "pdf");
+        boolean isHtml = suffix.equalsIgnoreCase("xls") || suffix.equalsIgnoreCase("xlsx") || suffix.equalsIgnoreCase("csv") || suffix.equalsIgnoreCase("xlsm") || suffix.equalsIgnoreCase("xlt") || suffix.equalsIgnoreCase("xltm") || suffix.equalsIgnoreCase("et") || suffix.equalsIgnoreCase("ett") || suffix.equalsIgnoreCase("xlam");
+        String pdfName = fileName.substring(0, fileName.lastIndexOf(".") ) + suffix +"." +(isHtml ? "html" : "pdf"); //生成文件添加类型后缀 防止同名文件
         String cacheFileName = userToken == null ? pdfName : userToken + "_" + pdfName;
         String outFilePath = FILE_DIR + cacheFileName;
         if (forceUpdatedCache|| !fileHandlerService.listConvertedFiles().containsKey(pdfName) || !ConfigConstants.isCacheEnabled()) {
diff --git a/server/src/main/java/cn/keking/service/impl/TiffFilePreviewImpl.java b/server/src/main/java/cn/keking/service/impl/TiffFilePreviewImpl.java
index 8d9beaba..2500a23c 100644
--- a/server/src/main/java/cn/keking/service/impl/TiffFilePreviewImpl.java
+++ b/server/src/main/java/cn/keking/service/impl/TiffFilePreviewImpl.java
@@ -39,6 +39,7 @@ public class TiffFilePreviewImpl implements FilePreview {
         String baseUrl = BaseUrlFilter.getBaseUrl();
         String tifPreviewType = ConfigConstants.getTifPreviewType();
         String tifOnLinePreviewType = fileAttribute.getTifPreviewType();
+        String suffix = fileAttribute.getSuffix();
         boolean forceUpdatedCache=fileAttribute.forceUpdatedCache();
         if (StringUtils.hasText(tifOnLinePreviewType)) {
             tifPreviewType = tifOnLinePreviewType;
@@ -47,8 +48,8 @@ public class TiffFilePreviewImpl implements FilePreview {
             model.addAttribute("currentUrl", url);
             return TIFF_FILE_PREVIEW_PAGE;
         } else if ("jpg".equalsIgnoreCase(tifPreviewType) || "pdf".equalsIgnoreCase(tifPreviewType)) {
-            String pdfName = fileName.substring(0, fileName.lastIndexOf(".") + 1) + "pdf";
-            String jpgName = fileName.substring(0, fileName.lastIndexOf(".") + 1) + "jpg";
+            String pdfName = fileName.substring(0, fileName.lastIndexOf(".")) + suffix +"." + "pdf" ; //生成文件添加类型后缀 防止同名文件
+            String jpgName = fileName.substring(0, fileName.lastIndexOf(".")) + suffix +"." + "jpg" ; //生成文件添加类型后缀 防止同名文件
             String strLocalTif = fileDir + fileName;
             String outFilePath = fileDir + pdfName;
             if ("pdf".equalsIgnoreCase(tifPreviewType)) {