springboot下载文件

1.后端：
public void getExcelTemplate(HttpServletResponse response) throws UnsupportedEncodingException {

　　　//文件名最好不要用中文，会出现中文乱码
    InputStream inputStream = new BufferedInputStream(this.getClass().getResourceAsStream("/template/template.xlsx"));

    response.reset();
    response.setContentType("application/octet-stream");
    response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode("模板.xlsx", "UTF-8"));

    // 循环取出流中的数据
    byte[] b = new byte[1024];
    int len;
    try {
        while ((len = inputStream.read(b)) > 0)
            response.getOutputStream().write(b, 0, len);
        inputStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
2.前端
可以直接使用window.location.href方式打开

downloadTemplate() {
    window.location.href = "http://localhost:8080/getTemplate";
}