fix--音频文件支持拖动

src/main/java/com/biutag/supervision/controller/FileController.java

@@ -60,6 +60,28 @@ public class FileController {
     @GetMapping("stream/**")
     public void download(HttpServletRequest request, HttpServletResponse response) throws IOException {
         String filePath = request.getRequestURI().substring(12);
+        String lower = filePath.toLowerCase();
+        String range = request.getHeader("Range");
+        if (StrUtil.isNotBlank(range) && range.startsWith("bytes=")) {
+            try (var upstream = fileService.downloadResponse(filePath, range);
+                 InputStream is = upstream.bodyStream()) {
+                String contentType = Optional.ofNullable(upstream.header("Content-Type"))
+                        .orElseGet(() -> guessContentType(lower));
+                response.setContentType(contentType);
+                response.setHeader("Accept-Ranges", "bytes");
+                String contentRange = upstream.header("Content-Range");
+                if (StrUtil.isNotBlank(contentRange)) response.setHeader("Content-Range", contentRange);
+                String contentLength = upstream.header("Content-Length");
+                if (StrUtil.isNotBlank(contentLength)) response.setHeader("Content-Length", contentLength);
+                response.setStatus(upstream.getStatus());
+                IoUtil.copy(is, response.getOutputStream());
+                return;
+            } catch (Exception e) {
+                log.error("Range stream failed, filePath={}, range={}", filePath, range, e);
+                response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
+                return;
+            }
+        }
         if (filePath.toLowerCase().endsWith(".pdf")) {
             response.setContentType("application/pdf");
         } else {
@@ -99,4 +121,11 @@ public class FileController {
         return Result.success(JSONObject.of("html", WordUtil.convertHtml(is)));
     }
 
+    private String guessContentType(String lower) {
+        if (lower.endsWith(".mp4")) return "video/mp4";
+        if (lower.endsWith(".webm")) return "video/webm";
+        if (lower.endsWith(".mp3")) return "audio/mpeg";
+        if (lower.endsWith(".wav")) return "audio/wav";
+        return "application/octet-stream";
+    }
 }

src/main/java/com/biutag/supervision/service/FileService.java

@@ -1,6 +1,8 @@
 package com.biutag.supervision.service;
 
 import cn.hutool.core.io.FileUtil;
+import cn.hutool.core.util.StrUtil;
+import cn.hutool.http.HttpRequest;
 import cn.hutool.http.HttpResponse;
 import cn.hutool.http.HttpUtil;
 import com.biutag.supervision.mapper.FileBase64Mapper;
@@ -62,4 +64,14 @@ public class FileService {
         return httpResponse.bodyStream();
     }
 
+
+    public HttpResponse downloadResponse(String filePath, String range) {
+        HttpRequest req = HttpUtil.createGet(FDFS_PREVIEW_URL + filePath)
+                .header("Accept-Encoding", "identity");
+        if (StrUtil.isNotBlank(range)) {
+            req.header("Range", range);
+        }
+        return req.execute();
+    }
+
 }