已有文件下载

小灰灰 2022-05-28 10:25 158阅读 0赞

前面讲过文件的上传，下载更容易一点，就是输入流和输出流的使用，把工程中的文件赋给响应头：

浏览器输入网址，

![2018040315465635][]

/**
         * 选择列表导入方式
         * 模板下载
         * 导出excel
         */
        @GetMapping("/download")
        public Result download(HttpServletRequest req, HttpServletResponse response){
          //工程中文件
           String fileName = "release.xlsx";
            String path =  System.getProperty("user.dir")+File.separator+"app-release-job"+
                   File.separator+"src" +File.separator+"main"+File.separator+
                   "resources"+File.separator+"excel" +File.separator+ fileName;
            System.out.print("路径为"+path);
            File file = new File(path);
    
                response.setContentType("application/octet-stream");
                response.addHeader("Content-Disposition","attachment;filename="+fileName);
                byte[] buffer = new byte[1024];
                FileInputStream fis =null;
                BufferedInputStream bis =null;
                try {
                    fis = new FileInputStream(file);
                    bis = new BufferedInputStream(fis);
                    OutputStream os =response.getOutputStream();
                    int i =bis.read(buffer);
                    while (i!=-1) {
                        os.write(buffer, 0, i);
                        i=bis.read(buffer);
                    }
                    bis.close();
                    fis.close();
                } catch (Exception e) {
                    e.printStackTrace();
                    return ResultGenerator.genCostomFailResult(ResultCode.DELETE_FAIL_ERROR, "导出失败");
    
                } finally {
                    try {
                        bis.close();
                        fis.close();
                    }catch (Exception e){
                        return ResultGenerator.genCostomFailResult(ResultCode.DELETE_FAIL_ERROR, "导出失败");
    
                    }
                }
    
    
            return ResultGenerator.genSuccessResult("导出成功");
        }

下载也可以在前端做：

<div class='template'>
                 
                    <div class="template-container">
                        <a href="../../fileUpload/temp/收入模板.xlsx" download="收入模板.xlsx" class='content even'>收入模板下载</a>
                        <a href="../../fileUpload/temp/退费模板.xlsx" download="退费模板.xlsx" class='content odd'>退费模板下载</a>
                       
                    </div>
                </div>

[2018040315465635]: /images/20220528/1b72b5ee25904cd7ab40cdff5fca7049.png