Java中实现文件下载通用方式

ゞ浴缸里的玫瑰 2022-10-07 08:58 218阅读 0赞

文件下载只需要四步：

1.设置文件ContentType类型

response.setContentType("multipart/form-data");

2.设置文件头

response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));

3.通过response获取ServletOutputStream对象(out)

InputStream inputStream = xxxxx.downloadFile(fileName);

4.写到输出流(out)中

IOUtils.copy(inputStream, response.getOutputStream());
    inputStream.close();

下面给出代码块，亲测可执行：

1.基于OSS实现文件下载

@RequestMapping(value = "/ossDown",method = RequestMethod.GET)
        @ResponseBody
        @SneakyThrows
        public void ossDown(@RequestParam("bucketName") String 
           bucketName,@RequestParam("fileName") String fileName, HttpServletResponse response){
    
            response.setContentType("multipart/form-data");
            response.setHeader("Content-Disposition", "attachment;filename=" +URLEncoder.encode(fileName, "UTF-8"));
            InputStream inputStream = ossComponent.downloadFile(bucketName, fileName);
            IOUtils.copy(inputStream, response.getOutputStream());
            inputStream.close();
        }

OSS执行组件部分，亲测可行，获取[直达地址][Link 1]

2.基于minIO实现文件下载

/**
         * 下载文件
         * @param fileName
         * @param response
         * @throws Exception
         */
        @RequestMapping(value = "/minioDown",method = RequestMethod.GET)
        @ResponseBody
        @SneakyThrows(Exception.class)
        public void minioDown(@RequestParam("fileName") String fileName, HttpServletResponse response)throws Exception {
    
            ObjectStat stat = minioUtils.statObject("peach", fileName);
            response.setContentType(stat.contentType());
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            InputStream in = minioUtils.getObject("", fileName);
            IOUtils.copy(in, response.getOutputStream());
            in.close();
    
        }

关于minio的Java操作部分，[点击直达][Link 2]，亲测可行，可直接项目使用，也可学习

[Link 1]: https://download.csdn.net/download/peach_garden/19695921
[Link 2]: https://download.csdn.net/download/peach_garden/19698425