1

src/main/java/com/th/demo/tools/Tools.java

@@ -138,12 +138,21 @@ public class Tools {
 
 
 
+
+
     ///123423456
     public static OutputStream getExportOutStream(String filename, HttpServletResponse response) {
         OutputStream out = null;
         try {
-            response.setContentType("application/vnd.ms-excel");
+            // 使用正确的 xlsx Content-Type
+            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
             response.setHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes("UTF-8"), "ISO8859-1"));
+            // 禁用缓存
+            response.setHeader("Pragma", "no-cache");
+            response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
+            response.setHeader("Expires", "0");
+            // 设置缓冲区大小为大文件优化
+            response.setBufferSize(8192); // 8KB buffer
             out = response.getOutputStream();
         } catch (Exception ex) {
             ex.printStackTrace();