求教 Java .nio.file.Paths.get 从 Linux 迁移到 Windows 时出错是什么原因

Java 小白，没调试环境，参照别人项目说明用 gradle 在 windows 上 build 了一个 jar 包，运行时出现 java.nio.file.InvalidPathException: Illegal cha <:> at index 11: undefined/R:/temp 错误，感觉可能是 windows 盘符路径或反斜杠的坑，问题可能在后端也可能在前端，求教最可能的原因。同样操作在 linux 上运行是没有问题的。

项目是这个 https://github.com/epam/NGB，因为没人回答 issue 来这里问问。项目大概是 tomcat 做 server，angurjs 还是啥的做的前端，用 REST 做服务。

log 里面的错误前几行是：

ERROR [06/04/2021 01:50:55][http-nio-8080-exec-9][com.epam.catgenome.controller.ExceptionHandlerAdvice] This operation has been aborted: uri=/catgenome/restapi/files;client=0:0:0:0:0:0:0:1. java.nio.file.InvalidPathException: Illegal char <:> at index 11: undefined/R:/temp at sun.nio.fs.WindowsPathParser.normalize(Unknown Source) at sun.nio.fs.WindowsPathParser.parse(Unknown Source) at sun.nio.fs.WindowsPathParser.parse(Unknown Source) at sun.nio.fs.WindowsPath.parse(Unknown Source) at sun.nio.fs.WindowsFileSystem.getPath(Unknown Source) at java.nio.file.Paths.get(Unknown Source) at com.epam.catgenome.manager.FileManager.loadDirectoryContents(FileManager.java:1919) at com.epam.catgenome.controller.UtilsController.loadDirectoryContents(UtilsController.java:138) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) 

在 chrome 里面抓到的请求是下面这个，返回是个空的 400 错误

http://127.0.0.1:58123/catgenome/restapi/files?path=R:\temp

相关文件的代码是：

com.epam.catgenome.manager.FileManager.loadDirectoryContents(FileManager.java:1919)

 /** * Returns contents of a directory, specified by path, to browse NGS files * * @param path a path to directory to browse * @return {@link List} of {@link FsDirectory}s, and {@link FsFile}, representing subdirectories and files * @throws IOException */ public List<AbstractFsItem> loadDirectoryContents(String path) throws IOException { if(!StringUtils.isEmpty(path) && !Paths.get(path).startsWith(ngsDataRootPath)) { // 第 1919 行 throw new AccessDeniedException( String.format("Parameter path doesn't fall into 'ngs.data.root.path': %s", ngsDataRootPath)); } if (!filesBrowsingAllowed || ngsDataRootPath.equals(FILE_SYSTEM_ROOT)) { throw new AccessDeniedException("Server file system browsing is not allowed"); } List<File> parentDirs = new ArrayList<>(); if (path == null) { parentDirs.add(new File(ngsDataRootPath)); } else { parentDirs.add(new File(path)); } Assert.isTrue(parentDirs.stream().allMatch(File::exists), "Specified path does not exist: " + path); Assert.isTrue(parentDirs.stream().allMatch(File::isDirectory), "Specified path is not a directory: " + path); List<AbstractFsItem> items = new ArrayList<>(); boolean accessDenied = false; String fileName = ""; String otherFileName = ""; for (File parentDir : parentDirs) { if (parentDir.listFiles() == null) { continue; } try (DirectoryStream<Path> dirStream = Files.newDirectoryStream(parentDir.toPath())) { for (Path child : dirStream) { try { File childFile = child.toFile(); if (childFile.isDirectory()) { FsDirectory directory = new FsDirectory(); directory.setPath(childFile.getAbsolutePath()); if (childFile.canRead()) { directory.setFileCount(countChildrenFiles(child)); } items.add(directory); } else { addFsFile(items, childFile); } } catch (AccessDeniedException e) { LOGGER.error("Access denied:", e); accessDenied = true; fileName = e.getFile(); otherFileName = e.getOtherFile(); } } if (items.isEmpty() && accessDenied) { throw new AccessDeniedException(fileName, otherFileName, "Access denied"); } } } return items; } 

com.epam.catgenome.controller.UtilsController.loadDirectoryContents(UtilsController.java:138)

 @ResponseBody @RequestMapping(value = "/files", method = RequestMethod.GET) @ApiOperation( value = "Returns directory contents", notes = "Returns directory contents, specified by path", produces = MediaType.APPLICATION_JSON_VALUE) @ApiResponses( value = {@ApiResponse(code = HTTP_STATUS_OK, message = API_STATUS_DESCRIPTION) }) public Result<FilesVO> loadDirectoryContents(@RequestParam(required = false) String path) throws IOException { return Result.success(new FilesVO(fileManager.loadDirectoryContents(path), fileManager.getNgsDataRootPath())); // 第 138 行 }