Example Analysis of Super full File tool Class FileUtil
= 0? _ sFilePathName.substring (0, nPos + 1): ");} / * * extract the file name (including extension) from the full pathname (path + file name) of the file
* for example: d:\ path\ file.ext-> file.ext * * @ param _ sFilePathName * @ return * / public static String extractFileName (String _ sFilePathName) {return extractFileName (_ sFilePathName, File.separator);} / * extract the file name (including extension) from the full pathname (path + file name) of the file
* for example: d:\ path\ file.ext-- > file.ext * * @ param _ sFilePathName full file path name * @ param _ sFileSeparator file separator * @ return * / public static String extractFileName (String _ sFilePathName, String _ sFileSeparator) {int nPos =-1; if (_ sFileSeparator = = null) {nPos = _ sFilePathName.lastIndexOf (File.separatorChar); if (nPos)
< 0) { nPos = _sFilePathName .lastIndexOf(File.separatorChar == '/' ? '\\' : '/'); } } else { nPos = _sFilePathName.lastIndexOf(_sFileSeparator); } if (nPos < 0) { return _sFilePathName; } return _sFilePathName.substring(nPos + 1); } /** * 检查指定文件的路径是否存在 * * @param _sPathFileName 文件名称(含路径） * @return 若存在，则返回true；否则，返回false */ public static boolean pathExists(String _sPathFileName) { String sPath = extractFilePath(_sPathFileName); return fileExists(sPath); } public static boolean fileExists(String _sPathFileName) { File file = new File(_sPathFileName); return file.exists(); } /** * 创建目录 * * @param _sDir 目录名称 * @param _bCreateParentDir 如果父目录不存在，是否创建父目录 * @return */ public static boolean makeDir(String _sDir, boolean _bCreateParentDir) { boolean zResult = false; File file = new File(_sDir); if (_bCreateParentDir) zResult = file.mkdirs(); // 如果父目录不存在，则创建所有必需的父目录 else zResult = file.mkdir(); // 如果父目录不存在，不做处理 if (!zResult) zResult = file.exists(); return zResult; } /** * 移除字符串中的BOM前缀 * * @param _sLine 需要处理的字符串 * @return 移除BOM后的字符串. */ private static String removeBomHeaderIfExists(String _sLine) { if (_sLine == null) { return null; } String line = _sLine; if (line.length() > < extenPosi ? filePath.substring(filePosi + 1, extenPosi) : filePath.substring(filePosi + 1)); } /** * get file name from path, include suffix * * * getFileName(null) = null * getFileName("") = "" * getFileName(" ") = " " * getFileName("a.mp3") = "a.mp3" * getFileName("a.b.rmvb") = "a.b.rmvb" * getFileName("abc") = "abc" * getFileName("c:\\") = "" * getFileName("c:\\a") = "a" * getFileName("c:\\a.b") = "a.b" * getFileName("c:a.txt\\a") = "a" * getFileName("/home/admin") = "admin" * getFileName("/home/admin/a.txt/b.mp3") = "b.mp3" * * * @param filePath * @return file name from path, include suffix */ public static String getFileName(String filePath) { if (StringUtils.isEmpty(filePath)) { return filePath; } int filePosi = filePath.lastIndexOf(File.separator); return (filePosi == -1) ? filePath : filePath.substring(filePosi + 1); } /** * get folder name from path * * * getFolderName(null) = null * getFolderName("") = "" * getFolderName(" ") = "" * getFolderName("a.mp3") = "" * getFolderName("a.b.rmvb") = "" * getFolderName("abc") = "" * getFolderName("c:\\") = "c:" * getFolderName("c:\\a") = "c:" * getFolderName("c:\\a.b") = "c:" * getFolderName("c:a.txt\\a") = "c:a.txt" * getFolderName("c:a\\b\\c\\d.txt") = "c:a\\b\\c" * getFolderName("/home/admin") = "/home" * getFolderName("/home/admin/a.txt/b.mp3") = "/home/admin/a.txt" * * * @param filePath * @return */ public static String getFolderName(String filePath) { if (StringUtils.isEmpty(filePath)) { return filePath; } int filePosi = filePath.lastIndexOf(File.separator); return (filePosi == -1) ? "" : filePath.substring(0, filePosi); } /** * get suffix of file from path * * * getFileExtension(null) = "" * getFileExtension("") = "" * getFileExtension(" ") = " " * getFileExtension("a.mp3") = "mp3" * getFileExtension("a.b.rmvb") = "rmvb" * getFileExtension("abc") = "" * getFileExtension("c:\\") = "" * getFileExtension("c:\\a") = "" * getFileExtension("c:\\a.b") = "b" * getFileExtension("c:a.txt\\a") = "" * getFileExtension("/home/admin") = "" * getFileExtension("/home/admin/a.txt/b") = "" * getFileExtension("/home/admin/a.txt/b.mp3") = "mp3" * * * @param filePath * @return */ public static String getFileExtension(String filePath) { if (StringUtils.isBlank(filePath)) { return filePath; } int extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR); int filePosi = filePath.lastIndexOf(File.separator); if (extenPosi == -1) { return ""; } return (filePosi >= extenPosi)? ": filePath.substring (extenPosi + 1);} / * Creates the directory named by the trailing filename of this file, including the complete directory path required * to create this directory. * Attentions: * makeDirs ("C:\\ Users\\ Trinea") can only create users folder * makeFolder ("C:\\ Users\\ Trinea\") can create Trinea folder * @ param filePath * @ return true if the necessary directories have been created or the target directory already exists, false one of * the directories can not be created. * * if {@ link FileUtils#getFolderName (String)} return null, return false * if target directory already exists, return true * return {@ link File#makeFolder} * * / public static boolean makeDirs (String filePath) {String folderName = getFolderName (filePath); if (StringUtils.isEmpty (folderName)) {return false;} File folder = new File (folderName); return (folder.exists () & & folder.isDirectory ())? True: folder.mkdirs ();} / * * @ param filePath * @ return * @ see # makeDirs (String) * / public static boolean makeFolders (String filePath) {return makeDirs (filePath);} / * Indicates if this file represents a file on the underlying file system. * * @ param filePath * @ return * / public static boolean isFileExist (String filePath) {if (StringUtils.isBlank (filePath)) {return false;} File file = new File (filePath); return (file.exists () & & file.isFile ());} / * * Indicates if this file represents a directory on the underlying file system. * * @ param directoryPath * @ return * / public static boolean isFolderExist (String directoryPath) {if (StringUtils.isBlank (directoryPath)) {return false;} File dire = new File (directoryPath); return (dire.exists () & & dire.isDirectory ());} / * * delete file or directory * * if path is null or empty, return true * if path not exist, return true * if path exist, delete recursion. Return true * @ param path * @ return * / public static boolean deleteFile (String path) {if (StringUtils.isBlank (path)) {return true;} File file = new File (path); if (! file.exists ()) {return true;} if (file.isFile ()) {return file.delete ();} if (! file.isDirectory ()) {return false } for (File f: file.listFiles ()) {if (f.isFile ()) {f.delete ();} else if (f.isDirectory ()) {deleteFile (f.getAbsolutePath ());}} return file.delete () } / * * get file size * * if path is null or empty, return-1 * if path exist and it is a file, return file size, else return-1 * @ param path * @ return returns the length of this file in bytes. Returns-1 if the file does not exist. * / public static long getFileSize (String path) {if (StringUtils.isBlank (path)) {return-1;} File file = new File (path); return (file.exists () & & file.isFile ()? File.length ():-1);}} these are all the contents of the article "sample Analysis of the Super full document tool Class FileUtil". Thank you for reading! 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