Springboot 和hutool文件上传下载

1、放开上传限制

servlet:
  multipart:
    enabled: true #默认支持文件上传
    max-file-size: -1 #不做限制
    max-request-size: -1 #不做限制
2、设置上传地址

#上传地址
z:
  url: http://127.0.0.1:9087/andon/file/
  upload: /home/project/file/andon/fileUpload
#获取配置文件地址

@Value("${z.upload}")
private String fileUploadPath;

@Value("${z.url}")
private String fileUploadUrl;

#上传代码

@ApiOperation("8.0 附件_上传")
@PostMapping(value = "/upload")
public Result upload(@RequestParam("file") MultipartFile file,
                     HttpServletRequest req) throws IOException {
    Map<String, Object> map = new HashMap<>();
    try {
        //文件上传
        String hostAddress = InetAddress.getLocalHost().getHostAddress();//获取文件的名称
        String filename = file.getOriginalFilename();
        //上传的文件夹
        String filePath = fileUploadPath;
        java.io.File path = new java.io.File(filePath);
        if (!path.exists()) {
            path.mkdirs();
        }
        String uuid = IdUtil.simpleUUID();
        String fileStr = filename.substring(filename.lastIndexOf("."));
        String newFileName = uuid + fileStr;
        //上传的文件
        String rootFilePath = filePath + newFileName;
        log.info("文件写入：" + rootFilePath);
        //上传
        FileUtil.writeBytes(file.getBytes(), rootFilePath);//使用Hutool工具包将我们接收到文件保存到rootFilePath中
        log.info("文件写入成功！");
        map.put("filename", filename);
        map.put("path", fileUploadUrl + newFileName);
        map.put("size", file.getSize());
        map.put("loadPath",rootFilePath);
    } catch (Exception e) {
        log.info("文件上传失败:", e);
    }
    return Result.success(map);
}

#下载代码

@GetMapping("/{flag}")
@ApiOperation("8.1 附件_下载")
public void getFiles(@PathVariable String flag, HttpServletResponse response, HttpServletRequest req) {
    OutputStream os;//新建一个输出流对象
    String basePath = fileUploadPath;
    List<String> fileNames = FileUtil.listFileNames(basePath);//获取所有的文件名称
    String fileName = fileNames.stream().filter(name -> name.contains(flag)).findAny().orElse("");//找到跟参数一致的文件
    try {
        if (StrUtil.isNotEmpty(fileName)) {
            java.io.File file = new java.io.File(basePath + fileName);
            long length = file.length();
            response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            response.setContentType("application/octet-stream");
            response.addHeader("totalSize", String.valueOf(length));
            response.setContentLengthLong(length);
            byte[] bytes = FileUtil.readBytes(file);//通过文件的路径读取文件字节流
            os = response.getOutputStream();//通过response的输出流返回文件
            os.write(bytes);
            os.flush();
            os.close();
        }
    } catch (Exception e) {
       log.info("文件下载失败:",e);
    }

}