java实现下载指定文件到本地

JAVA_AVA

于 2021-10-13 16:33:06 发布

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文章标签： java

本文链接：https://blog.youkuaiyun.com/javaDX/article/details/120746781

版权

该代码示例展示了如何在Java后端通过HttpServletResponse实现文件的下载。它首先获取文件路径，然后设置响应头以指定文件名和内容类型，最后读取文件并写入到输出流中完成下载过程。

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文件位置
代码实现

	/**
     * 下载
     * @return
     */
    @RequestMapping("/down")
    @ResponseBody
    public void down(HttpServletResponse response) throws Exception {

        //获取文件路径
        String path  = ClassUtils.getDefaultClassLoader().getResource("").getPath()+ "static/wj/工作表.xlsx";
        System.out.println("path = " + path);
        String fileName = path.substring(path.lastIndexOf("/") + 1);
        File file = new File(path);

        // 将文件名称进行编码
        response.setHeader("content-disposition","attachment;filename=" + URLEncoder.encode(fileName,"UTF-8"));
        response.setContentType("content-type:octet-stream");
        BufferedInputStream inputStream = new BufferedInputStream(new FileInputStream(file));
        OutputStream outputStream = response.getOutputStream();
        byte[] by = new byte[1024];
        int len=0;
        while ((len = inputStream.read(by)) != -1){
            outputStream.write(by,0,len);
        }

        inputStream.close();
        outputStream.close();
    }