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(); } } }