下载文件时两种返回方式

设置文件响应header及contentType


public void downloadFloodInfo(HttpServletRequest request, HttpServletResponse response) {
		String fileAllPath = "/xxxxxx/xxx/xxx.xxx";
        File file = new File(fileAllPath);
        if (file == null) {
            try {
                response.sendError(404, "文件不存在!");
                return;
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        try (
                FileInputStream fileInputStream = new FileInputStream(new File(fileAllPath));
                BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
                ServletOutputStream outputStream = response.getOutputStream();
                BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(outputStream);
        ) {
            // 设置response的Header
            response.setCharacterEncoding("utf-8");
            response.addHeader("Content-Disposition", "attachment;filename=" +  FileUtils.setFileDownloadHeader(request, FILE_NAME));
            response.addHeader("Content-Length", "" + FILE_SIZE);
            response.setContentType("application/octet-stream");
            byte[] buf = new byte[1024];
            int length = 0;
            while ((length = bufferedInputStream.read(buf)) != -1) {
                bufferedOutputStream.write(buf, 0, buf.length);
            }
        } catch (Exception e) {
            logger.info("读取文件{}异常 -> {}", FILE_NAME, e.getMessage());
        }
    }

直接返回文件

来源：https://blog.csdn.net/weixin_42548604/article/details/83827193

@RequestMapping("stream")
	public void getStreamData(HttpServletResponse response) {
		File file=new File("C:\\avi_vedio\\test.MP4");
		ServletOutputStream out=null;
		try {
			FileInputStream instream=new FileInputStream(file);
			byte[] b=new byte[1024];
			int length=0;
			BufferedInputStream buf=new BufferedInputStream(instream);
			out=response.getOutputStream();
			BufferedOutputStream bot=new BufferedOutputStream(out);
			while((length=buf.read(b))!=-1) {
				bot.write(b,0, b.length);
			}
		} catch (Exception  e) {
			// TODO Auto-generated catch block			e.printStackTrace();
		}
	}