java新式文件操作

public static Boolean checkFileExist (String filePath) {
        LOGGER.info("checkFileExist the input filePath {}", filePath);
        Path classJarPath = Paths.get(filePath);
        
        return Files.exists(classJarPath, LinkOption.NOFOLLOW_LINKS);
    }
    
 // 每次上传的时候
    public static void prepareFile(String globalVersion) throws IOException {
        
        FlinkThpoolInitializer flinkThPoolInitializer = SpringContextUtils.getBean("flinkThPoolInitializer", FlinkThpoolInitializer.class);
        
        String coreSizeStr = flinkThPoolInitializer.getProperties().getProperty("corePoolSize");
        Integer coreSize = Integer.valueOf(coreSizeStr);
        
        String emptyFileStr = flinkThPoolInitializer.getProperties().getProperty("emptyFile");
        
        String newFile = StringConstant.LINUX_JOB_DIRSUFFIX + emptyFileStr;
        Path newpath = Paths.get(newFile);
        
        File emptyFile = newpath.toFile();
        emptyFile.createNewFile(); // 创建辅助空文件
        String tmpJarFileName = "";
//        String globalVersion = httpForeignIntefaceConfigInitializer.getProperties().getProperty("Flink.JarName");
        String originalJarPath = StringConstant.LINUX_JOB_FILESUFFIX + globalVersion ;
        Path pathToAddFile = emptyFile.toPath();
        Map<String, String> env = new HashMap<>();
        env.put("create", "true");
        for (int i = 0; i < coreSize; i++) {//从0开始
            String uuid = UUID.randomUUID().toString().replaceAll("-", "");
            tmpJarFileName = originalJarPath.substring(0, originalJarPath.length() - 4) + "-upgrade" + i + ".jar";
            FileUtils.copyFile(new File(originalJarPath), new File(tmpJarFileName));// 创建中间文件 提交任务时 使用此文件
            Path path = Paths.get(tmpJarFileName);
            URI uri = URI.create("jar:" + path.toUri());
            try (FileSystem fs = FileSystems.newFileSystem(uri, env)) {// 向辅助空文件中写入uuid 并将空文件写入中间文件 保证同一批次间使用的jar文件不同
                Path nf = fs.getPath("emptyFile");
                Files.copy(pathToAddFile, nf, StandardCopyOption.REPLACE_EXISTING);
                Writer writer = Files.newBufferedWriter(nf, StandardCharsets.UTF_8, StandardOpenOption.CREATE);
                writer.write(uuid);
                writer.close();
            }
        }
    }