ClassLoader读取文件，springboot打jar包后读取不到

//s是地址+文件名 from fhadmin.cn
   private File loadNewFromResources(String s) {
       File file = new File( s);
        try {
            if (!file.exists()) {
                file.createNewFile();
                InputStream fileInput = SampleServerStartup.class.getClassLoader().getResourceAsStream( s);
                //from fhadmin.cn
                //file = File.createTempFile(s,"");
                System.out.println(file.getPath());
                System.out.println(file.getCanonicalPath());
                System.out.println(file.getName());
                //System.out.println("length:"+fileInput.available());
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                byte[] buffer = new byte[1024];
                int len = 0;
                while ((len = fileInput.read(buffer)) != -1) {
                    baos.write(buffer, 0, len);
                }
                fileInput.close();
                //System.out.println(content); //from fhadmin.cn
                FileOutputStream fileout = new FileOutputStream(file);
                baos.writeTo(fileout);
                baos.close();
                fileout.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return file;
    }