HttpServletResponse下载文件

使用HttpServletResponse下载文件

 @RequestMapping("/down")
    public void down(HttpServletRequest request,HttpServletResponse response) throws Exception{

        //1.获取要下载的文件的绝对路径

        String realPath = "/data/software/db/mysql-workbench-community-6.3.7-osx-x86_64.dmg";

        //2.获取要下载的文件名

        String fileName = realPath.substring(realPath.lastIndexOf("/") + 1);

        //3.设置content-disposition响应头控制浏览器以下载的形式打开文件

        response.setHeader("content-disposition","attachment;filename="

                +fileName);

        //4.获取要下载的文件输入流

        InputStream in = new FileInputStream(realPath);

        int len = 0;

        //5.创建数据缓冲区

        byte[] buffer = new byte[1024];

        //6.通过response对象获取OutputStream流

        OutputStream out = response.getOutputStream();

        //7.将FileInputStream流写入到buffer缓冲区

        while((len = in.read(buffer)) > 0) {

        //8.使用OutputStream将缓冲区的数据输出到客户端浏览器

            out.write(buffer,0, len);

        }

        in.close();


    }