Java下载CSV文件

@GetMapping("/download")
public void download(HttpServletResponse response, @RequestParam String path) throws Exception {

	// 让servlet用UTF-8转码，默认为ISO8859
    response.setCharacterEncoding("UTF-8");

    File file = new File(path);
    if (!file.exists()) {
	    // 让浏览器用UTF-8解析数据
        response.setHeader("Content-type", "text/html;charset=UTF-8");
        response.getWriter().write("文件不存在或已过期,请重新生成");
        return;
    }

    String fileName = URLEncoder.encode(path.substring(path.lastIndexOf("/") + 1), "UTF-8");
    response.setContentType("text/csv");
    response.setHeader("Content-Disposition", String.format("attachment; filename=\"%s\"", fileName));
    InputStream is = null;
    OutputStream os = null;

    try {
        is = new FileInputStream(path);
        byte[] buffer = new byte[1024];
        os = response.getOutputStream();
        int len;
        while((len = is.read(buffer)) > 0) {
            os.write(buffer,0, len);
        }
    }catch(Exception e) {
        throw new RuntimeException(e);
    }finally {
        try {
            if (is != null) is.close();
            if (os != null) os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}