【解决方案】springboot 打jar包后启动,resource下配置文件找不到

public static String getFileContent(String fileName) {
        StringBuilder sb = new StringBuilder();
        try {
            ClassPathResource classPathResource = new ClassPathResource(fileName);

            InputStream stream = classPathResource.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8.name()));
            String line;
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }
            return sb.toString();
        } catch (Exception e) {
            return sb.toString();
        }
    }