Springboot打jar包无法读取resource下文件

记一次springboot项目打jar包无法获取本地资源文件

• 本地环境

            ClassPathResource resource = new ClassPathResource("templates/xxx.xlsx");    
            InputStream in = resource.getInputStream();
            //下载文件
            downFile("xxx.xlsx",request,response,in);

使用该方法本地测试完全没有问题，结果发现打成jar包后就会提示找不到路径

方案一：

将资源文件放在jar包之外的路径，该方案维护性较差。

方案二：

使用 PathMatchingResourcePatternResolver 来读取文件资源。

      String fileName = URLEncoder.encode("xx", "UTF-8");
        response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
        response.setContentType("application/octet-stream; charset=UTF-8");
        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        Resource[] resources = resolver.getResources("templates/xx.xlsx");
        Resource resource = resources[0];
        InputStream stream = resource.getInputStream();
        StringBuilder buffer = new StringBuilder();
        byte[] bytes = new byte[1024];
        int len = 0;
        try {
            while ((len = stream.read(bytes)) != -1) {
                response.getOutputStream().write(bytes, 0, len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }