Java输出流文件下载

public void download(HttpServletResponse response){
        //读取一个classpath路径下的一个预下载文件
        org.springframework.core.io.Resource res = new ClassPathResource(TEMPLATE_FILE_PATH);
        InputStream ins = null;
        OutputStream out = null;
        try {
            //设置response header
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            response.setHeader("Content-Disposition", "attachment;filename=template.xlsx");
            ins = new BufferedInputStream(res.getInputStream());
            out = new BufferedOutputStream(response.getOutputStream());
            //缓冲下载
            byte[] buffer = new byte[BUFFER_SIZE];
            int n = 0;
            while((n = ins.read(buffer)) != -1){
                out.write(buffer, 0, n);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            //关闭流
            IOUtils.closeQuietly(ins);
            IOUtils.closeQuietly(out);
        }
    }

做个记录~