springboot 文件下载接口

最新推荐文章于 2025-09-15 15:18:05 发布

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本文介绍了如何在SpringBoot应用中实现文件下载功能，重点在于使用fileUploadRootDir变量设置的文件存储路径来完成文件的读取和发送到客户端的过程。

    @GetMapping("/download/{fileName}")
    @ResponseBody
    public ResponseEntity<Object> downloadFile(@PathVariable(name = "fileName") String fileName) throws FileNotFoundException {

        File file = new File(fileUploadRootDir + fileName);
        if (!file.exists())
        {
            return new ResponseEntity<Object>("{\"code\": \"00002\", \"info\":\"File Not Found!\"}", HttpStatus.BAD_REQUEST);
        }
        InputStreamResource resource = new InputStreamResource( new FileInputStream( file ) );

        HttpHeaders headers = new HttpHeaders();
        headers.add ( "Content-Disposition",String.format("attachment;filename=\"%s",fileName));
        headers.add ( "Cache-Control","no-cache,no-store,must-revalidate" );
        headers.add ( "Pragma","no-cache" );
        headers.add ( "Expires","0" );

        ResponseEntity<Object> responseEntity = ResponseEntity.ok()
                .headers ( headers )
                .contentLength ( file.length ())
                .contentType(MediaType.parseMediaType ( "application/octet-stream" ))
                .body(resource);



        return responseEntity;
    }

以上的代码可以用来下载文件，fileUploadRootDir 这个变量是文件的存储路径。