递归读取指定目录下的文件

序言

需要读取sftp服务器上符合指定的文件名正则的文件列表，目前想到的最好的办法就是递归。

我这里引入的依赖是：

        <!--   jsch-sftp连接     --><dependency><groupId>com.jcraft</groupId><artifactId>jsch</artifactId><version>0.1.54</version></dependency>

不废话直接上代码：

  public static List<String> getFileList(ChannelSftp channelSftp, String path, String fileNamePattern, Integer filePathDepth) {List<String> fileList = Lists.newLinkedList();try {Pattern pattern = Pattern.compile(fileNamePattern);Vector<ChannelSftp.LsEntry> files = channelSftp.ls(path);//读取的根路径下一级就是文件if (1 == filePathDepth) {for (ChannelSftp.LsEntry entry : files) {String fileName = entry.getFilename();//找到和规则（文件名正则）匹配的文件if (pattern.matcher(fileName).matches()) {//拼接全路径String fullPath = path + fileName;fileList.add(fullPath);}}} else {//从读取根路径下开始算目录深度时，目录深度大于1就使用递归来读取文件列表manyDirFileList(channelSftp, path, fileNamePattern, fileList, bComFilesaveReadruleDO.getDirPattern());}} catch (Exception e) {log.error("获取sftp指定目录下的文件列表失败，{}", e.getMessage());}return fileList;}/*** 递归获取提供的路径下多级目录下符合正则的所有文件** @param channelSftp ftp对象* @param path        路径* @param fileList    文件列表**/public static void manyDirFileList(ChannelSftp channelSftp, String path, String fileNamePattern,List<String> fileList, String dirPattern) throws Exception {try {List<Pattern> dirPatterns = new ArrayList<>();if (StringUtils.isNotEmpty(dirPattern)) {for (String pat : dirPattern.split(",")) {dirPatterns.add(Pattern.compile(pat.trim()));}}Pattern fileNamePat = Pattern.compile(fileNamePattern);if (isDirectory(channelSftp, path)) {Vector<?> vector = channelSftp.ls(path);for (Object l : vector) {ChannelSftp.LsEntry file = (ChannelSftp.LsEntry) l;String fileName = file.getFilename();boolean isDirMatch = dirPatterns.isEmpty();for (Pattern dirPat : dirPatterns) {if (dirPat.matcher(fileName).matches()) {isDirMatch = true;break;}}if (fileName.equals(".") || fileName.equals("..")) {continue;}if (isDirMatch || fileNamePat.matcher(fileName).matches()) {String fullPath = path + fileName + (file.getAttrs().isDir() ? "/" : "");manyDirFileList(channelSftp, fullPath, fileNamePattern, fileList, dirPattern);}}} else {String fileName = path.substring(path.lastIndexOf("/") + 1);if (fileNamePat.matcher(fileName).matches()) {fileList.add(path);}}} catch (SftpException e) {log.error("获取FTP指定目录下的文件异常，路径：{}，异常信息：{}", path, e.getMessage());} catch (Exception e) {log.error("递归获取SFTP指定目录下的文件列表失败，路径：{}，异常信息：{}", path, e.getMessage());throw new Exception("递归获取SFTP指定目录下的文件列表失败，路径：" + path + "，异常信息：" + e.getMessage());}}

另外还有一个需求就是只读取10个文件：

 public static List<String> getFileListFor10(ChannelSftp channelSftp,  String path, String fileNamePattern, Integer filePathDepth) {List<String> fileList = Lists.newLinkedList();try {Pattern pattern = Pattern.compile(fileNamePattern);Vector<ChannelSftp.LsEntry> files = channelSftp.ls(path);//读取的根路径下一级就是文件if (1 == filePathDepth) {for (ChannelSftp.LsEntry entry : files) {if (fileList.size() > 10) {log.info("已读取10个文件，不再读取目录:{}下的文件", path);break;}String fileName = entry.getFilename();//找到和规则（文件名正则）匹配的文件if (pattern.matcher(fileName).matches()) {//拼接全路径String fullPath = path + fileName;fileList.add(fullPath);}}} else {//从输入的根路径下开始算目录深度时，目录深度大于1就使用递归来读取文件列表manyDirFileListFor10(channelSftp, path, fileNamePattern, fileList, bComFilesaveReadruleDO.getDirPattern());}} catch (Exception e) {log.error("获取sftp指定目录下的文件列表失败，{}", e.getMessage());}return fileList;}/*** 递归获取提供的路径下多级目录下符合正则的前10个文件** @param channelSftp ftp对象* @param path        路径* @param fileList    文件列表**/public static void manyDirFileListFor10(ChannelSftp channelSftp, String path, String fileNamePattern,List<String> fileList, String dirPattern) {try {List<Pattern> dirPatterns = new ArrayList<>();if (StringUtils.isNotEmpty(dirPattern)) {for (String pat : dirPattern.split(",")) {dirPatterns.add(Pattern.compile(pat.trim()));}}Pattern fileNamePat = Pattern.compile(fileNamePattern);if (isDirectory(channelSftp, path)) {Vector<?> vector = channelSftp.ls(path);for (Object o : vector) {// 如果已经找到了10个文件，直接返回，不再递归if (fileList.size() >= 10) {log.info("已读取10个文件，不再读取目录:{}下的文件", path);break;}ChannelSftp.LsEntry file = (ChannelSftp.LsEntry) o;String fileName = file.getFilename();boolean isDirMatch = dirPatterns.isEmpty();for (Pattern dirPat : dirPatterns) {if (dirPat.matcher(fileName).matches()) {isDirMatch = true;break;}}if (fileName.equals(".") || fileName.equals("..")) {continue;}if (isDirMatch || fileNamePat.matcher(fileName).matches()) {String fullPath = path + fileName + (file.getAttrs().isDir() ? "/" : "");manyDirFileListFor10(channelSftp, fullPath, fileNamePattern, fileList, dirPattern);}}} else {String fileName = path.substring(path.lastIndexOf("/") + 1);if (fileNamePat.matcher(fileName).matches()) {fileList.add(path);}}} catch (SftpException e) {log.error("获取FTP指定目录下的文件异常，路径：{}，异常信息：{}", path, e.getMessage());} catch (Exception e) {log.error("递归获取SFTP指定目录下的文件列表失败，路径：{}，异常信息：{}", path, e.getMessage());}}

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