Spring MVC 返回文件

最新推荐文章于 2024-05-22 19:58:07 发布

原创最新推荐文章于 2024-05-22 19:58:07 发布 · 1.8k 阅读

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#spring mvc #download #file

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本文详细介绍了如何使用Java实现文件返回的Controller，包括两种方法：一种是通过ResponseEntity返回字节数组，另一种是通过BufferedInputStream和BufferedOutputStream进行流操作。

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实现文件返回的Controller

第一种方法：

@RequestMapping(value = "/download", method = GET)
    public ResponseEntity<byte[]> download(@RequestParam(Constant.PARAM_NAME_FILEPATH) String filePath,
                         HttpServletResponse response) throws Exception {
        File file = fileSupport.getFile(filePath);
        if (file == null) {
            throw new FileNotFoundException(filePath + "不存在");
        }
        
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); 
        headers.setContentDispositionFormData("attachment", file.getName());
        byte[] data = FileUtils.readFileToByteArray(file);
        
        return new ResponseEntity<byte[]>(data, headers, HttpStatus.OK);        
    }

第二种方法：

@RequestMapping(value = "/download", method = GET)
    public void download(@RequestParam(Constant.PARAM_NAME_FILEPATH) String filePath,
                         HttpServletResponse response) throws Exception {

        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;

        File file = fileSupport.getFile(filePath);
        if (file == null) {
            throw new FileNotFoundException(filePath + "不存在");
        }

        try {
            long fileLength = file.length();
            response.setContentType("text/plain;");
            response.setHeader("Content-disposition", "attachment; filename=" + file.getName());
            response.setHeader("Content-Length", String.valueOf(fileLength));
            bis = new BufferedInputStream(new FileInputStream(file));
            bos = new BufferedOutputStream(response.getOutputStream());
            byte[] buff = new byte[2048];
            int bytesRead;
            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                bos.write(buff, 0, bytesRead);
            }
        } catch (Exception e) {
            throw new FileDownloadException("文件流转换异常");
        } finally {
            if (bis != null)
                bis.close();
            if (bos != null)
                bos.close();
        }
    }*