// 在这里设置HTTP响应头部、类型等相关信息
            // 在这里使用response.getOutputStream().write()方法将文件数据写入响应输出流
            // 最后记得添加关闭文件输入流和刷新响应输出流的逻辑
            File file = new File(filePath);
            if (file.exists()) {
                response.setContentType("application/octet-stream");
                response.setHeader("Content-Disposition", "attachment; filename=\"" + file.getName() + "\"");
                response.setContentLength((int) file.length());

                FileInputStream fis = new FileInputStream(file);
                byte[] buffer = new byte[1024];
                int bytesRead;

                while ((bytesRead = fis.read(buffer)) != -1) {
                    response.getOutputStream().write(buffer, 0, bytesRead);
                }
                response.setStatus(HttpServletResponse.SC_OK); // 发送200状态码
                
                /*JSONObject errorResponse = new JSONObject();
                errorResponse.put("status",200);
                errorResponse.put("message", "File download complete.");//e.getMessage()
                response.setContentType("application/json");
                response.getWriter().write(errorResponse.toString());*/
                fis.close();
                response.getOutputStream().flush();
                long endTime = System.currentTimeMillis();
                long duration = endTime - startTime;
                System.out.println("下载耗时: " + duration + "毫秒");

File file = new File(filePath);
            if (file.exists()) {
                response.setContentType("application/octet-stream");
                response.setHeader("Content-Disposition", "attachment; filename=\"" + file.getName() + "\"");
                response.setContentLength((int) file.length());

                FileInputStream fis = new FileInputStream(file);
                byte[] buffer = new byte[1024];
                int bytesRead;
                ByteArrayOutputStream jsonBuffer = new ByteArrayOutputStream(); // 创建一个字节数组输出流用于存储JSON数据
                while ((bytesRead = fis.read(buffer)) != -1) {
                    response.getOutputStream().write(buffer, 0, bytesRead);
                }
                JSONObject errorResponse = new JSONObject();
                errorResponse.put("status",200);
                errorResponse.put("message", "File download complete.");//e.getMessage()
                response.setContentType("application/json");
                //response.getWriter().write(errorResponse.toString());
                jsonBuffer.write(errorResponse.toString().getBytes()); // 将JSON数据写入缓冲区
                fis.close();
                response.getOutputStream().flush();
                response.setStatus(96587); // 发送200状态码   HttpServletResponse.SC_OK
                response.getOutputStream().write(jsonBuffer.toByteArray()); // 将缓冲区的数据写入response的输出流中