Spring boot访问resource下的文件

File file = ResourceUtils.getFile("classpath:test");    //test是resource下的文件下文件夹
        if(file.exists()){
            File[] files = file.listFiles();
            if(files != null){
                for(File childFile:files){
                    // 处理响应流，必须与服务器响应流输出的编码一致
                    InputStream inputStream = null;
                    BufferedReader br = null;
                    inputStream = new FileInputStream(childFile);
                    br = new BufferedReader(new InputStreamReader(inputStream));
                    StringBuilder sb = new StringBuilder();
                    String line;
                    while ((line = br.readLine()) != null)
                    {
                        sb.append(line);
                    }
                    System.out.println(sb.toString());

                }
            }
        }

如果打成jar包运行项目，会存在找不到资源的错误。

解决方法：

ClassPathResource cpr = new ClassPathResource(fileUrl);
            byte[] bdata = FileCopyUtils.copyToByteArray(cpr.getInputStream());
            data = new String(bdata, StandardCharsets.UTF_8);
            return data;