java 文件下载代码

weixin_43289620

于 2019-12-05 10:04:25 发布

阅读量266

点赞数

CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/weixin_43289620/article/details/103399289

@Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        String fileName = "图片.jpg";//也可从前台传过来
        //打散：按当前的字符编码进行打散
        byte[] bytes = fileName.getBytes("UTF-8");
        //组装：按目标字符编码进行组装
        fileName = new String(bytes, "ISO8859-1");


        //修改响应的头部属性content-disposition值为attachment
        resp.setHeader("content-disposition","attachment;filename="+fileName);

        //获取连接服务端资源文件的输入流
        InputStream is = this.getServletContext().getResourceAsStream("/files/1.jpg");
        //获取输出流
        ServletOutputStream out = resp.getOutputStream();
        //将输入流中的数据写入到输出流中
        int len = -1;
        byte[] buf = new byte[1024];
        while((is.read(buf))!=-1){
            out.write(buf,0,len);
        }

        //关闭流
        out.close();
        is.close();


    }