springboot jar包 无法读取静态资源文件

参考 springboot项目读取resources目录下的文件的9种方式

	Resource resource = resourceLoader.getResource("classpath:static/jkbw/jkbw4.txt");
                try{
                    InputStream inputStream = resource.getInputStream();

                    BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                    StringBuilder out = new StringBuilder();
                    String newLine = System.getProperty("line.separator");
                    String line;
                    while ((line = reader.readLine()) != null) {
                        out.append(line);
                        out.append(newLine);
                    }
                    return out;

                } catch (IOException e) {
                    e.printStackTrace();
                }