更新数据同步

src/main/java/com/mini/capi/utils/FileUtils.java

@@ -85,30 +85,23 @@ public class FileUtils {
     /**
      * 下载文件核心方法
      */
-    public static void downloadFile(HttpServletResponse response, File file, String downloadFileName) throws IOException {
-        // 1. 校验文件合法性
-        if (file == null || !file.exists() || !file.isFile()) {
-            throw new FileNotFoundException("文件不存在或不是有效文件：" + (file != null ? file.getAbsolutePath() : "null"));
-        }
-        if (!file.canRead()) {
-            throw new IOException("文件无读取权限：" + file.getAbsolutePath());
-        }
-        // 2. 设置响应头（解决中文乱码、触发下载对话框）
-        response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE); // 二进制流
-        String fileName = downloadFileName != null ? downloadFileName : file.getName();
-        // 文件名URLEncoder编码，兼容浏览器中文显示
-        String encodedFileName = URLEncoder.encode(fileName, StandardCharsets.UTF_8);
-        response.setHeader("Content-Disposition", "attachment; filename*=UTF-8''" + encodedFileName);
-        response.setContentLengthLong(file.length()); // 设置文件大小（可选，优化体验）
-        // 3. 流传输文件（try-with-resources自动关闭流）
-        try (InputStream in = new FileInputStream(file);
-             OutputStream out = response.getOutputStream()) {
-            byte[] buffer = new byte[1024 * 8]; // 8KB缓冲区，提升传输效率
+    public static void downloadFile(HttpServletResponse response, File file, String downloadFileName) throws Exception {
+        String encodedName = URLEncoder.encode(downloadFileName, StandardCharsets.UTF_8);
+        // 设置响应头
+        response.setContentType("application/octet-stream");
+        response.setContentLengthLong(file.length());
+        response.setHeader("Content-Disposition",
+                String.format("attachment; filename=\"%s\"; filename*=UTF-8''%s", encodedName, encodedName));
+        response.setHeader("Cache-Control", "no-cache");
+        // 流传输（自动关闭）
+        try (InputStream in = new BufferedInputStream(new FileInputStream(file));
+             OutputStream out = new BufferedOutputStream(response.getOutputStream())) {
+            byte[] buf = new byte[4096];
             int len;
-            while ((len = in.read(buffer)) != -1) {
-                out.write(buffer, 0, len);
+            while ((len = in.read(buf)) != -1) {
+                out.write(buf, 0, len);
             }
-            out.flush(); // 强制刷出缓冲区数据
+            out.flush();
         }
     }