spingboot本地下载文件_spinrgboot 文件下载-优快云博客

本文链接：https://blog.youkuaiyun.com/cxmfly11/article/details/129957097

该文章介绍了如何在JavaWeb应用中使用Servlet处理文件下载。通过Controller层设置请求映射，Service层实现文件读取和响应流处理，实现从指定路径下载文件并强制以附件形式下载的功能。

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0、引入依赖

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>

一、controller层

 @Operation( summary = "下载2")
    @GetMapping("/")
    @ResponseBody
    public void downloadZip(@RequestParam(defaultValue = "D:\\uploads\\ITCHARGING-9017-项目制列账优化需求测试报告.docx") String downloadPath, HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException {
        //下载图片
//        downloadPath="D:\\uploads\\ITCHARGING-9017-项目制列账优化需求测试报告.docx";
        String down = downloadUtil.downloadPathFile(downloadPath, request, response);
    }

二、service层-接口

/**
     * @Description:下载
     * @Param downloadPath 文件路径
     */
    String downloadPathFile(String downloadPath, HttpServletRequest request, HttpServletResponse response);

三、service层-实现类

 /**
     * @Description:下载
     * @Param downloadPath 文件路径
     */
    @Override
    public String downloadPathFile(String path, HttpServletRequest request, HttpServletResponse response) {
        //设置文件路径
        File file = new File(path);
        //获取文件名称
        String fileName = file.getName();
        //判断文件是否存在
        if (file.exists()) {
            response.setContentType("application/force-download");// 设置强制下载不打开
            response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);// 设置文件名
            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);
                }
                file.delete();
                return "下载成功";
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (bis != null) {
                    try {
                        bis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (fis != null) {
                    try {
                        fis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
        return "下载失败";
    }

参考：https://blog.youkuaiyun.com/xinshoumeinianda/article/details/127884877