Java 实现文件上传、下载、预览

原创已于 2023-02-15 14:22:10 修改 · 1.2k 阅读

3 ·

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文章标签：

#java #服务器 #前端

于 2021-08-17 17:33:16 首次发布

直接上图，亲测有效

1.下载、预览

@GetMapping("/download")
    public void download(@RequestParam("online")Boolean online, HttpServletResponse response) throws IOException {
        FileInputStream fileInputStream = new FileInputStream("D://文件服务器//测试//ccc.pdf");
        if(online){     //下载
            response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode( "计划书.pdf", "UTF-8"));
        }
        StreamUtils.copy(fileInputStream,response.getOutputStream());
    }

2.文件上传

    @PostMapping("/upload")
    public String upload(@RequestBody String base64) {
        try {
            ByteArrayInputStream imgIptStream = new ByteArrayInputStream(Base64.decodeBase64(base64));
            File signFile = File.createTempFile("sign", ".png");
            FileCopyUtils.copy(imgIptStream, new FileOutputStream(signFile));
            //保存signFile到文件服务器
            String fileId = uploadFileServerUtil.uploadFile(signFile);
        } catch (Exception e) {
            return "文件上传发生异常";
        }
        return "文件上传成功";
    }