1、创建文件或文件夹

/ * 创建文件或文件夹 */ public static boolean createFileDir(File dirFile) { if (dirFile == null) return true; if (dirFile.exists()) return true; File parentFile = dirFile.getParentFile(); if (parentFile != null && !parentFile.exists()) { //父文件夹不存在，则先创建父文件夹，再创建自身文件夹 return createFileDir(parentFile) && createFileDir(dirFile); } else { boolean mkdirs = dirFile.mkdirs(); boolean isSuccess = mkdirs || dirFile.exists(); return isSuccess; } }

2、删除文件或文件夹

讯享网/ * 删除文件或文件夹 */ public static void deleteFile(File file) { if (file.exists()) { if (file.isFile()) { file.delete(); } else if (file.isDirectory()) { File files[] = file.listFiles(); if (files != null) { for (int i = 0; i < files.length; i++) { deleteFile(files[i]); } } } // 删除文件夹 file.delete(); } }

3、获取文件夹数量

/ * 获取文件数量 */ public static int getFileNum(File file) { int fileNum = 0; if (file.exists() && file.isDirectory()) { File files[] = file.listFiles(); if (files != null) { fileNum = files.length; } } return fileNum; }

4、压缩文件或文件夹

讯享网/ * 压缩文件和文件夹 * @param srcFileString 要压缩的文件或文件夹 * @param zipFileString 压缩完成的Zip路径 * @param notFile 忽略压缩文件 * @throws Exception */ public static void ZipFolder(String srcFileString, String zipFileString) { try { ZipOutputStream outZip = new ZipOutputStream(new FileOutputStream(zipFileString)); File file = new File(srcFileString); ZipFiles(file.getParent() + File.separator, file.getName(), outZip); outZip.finish(); outZip.close(); } catch (Exception e){ e.printStackTrace(); } } / * 压缩文件 * @param folderString * @param fileString * @param zipOutputSteam * @throws Exception */ private static void ZipFiles(String folderString, String fileString, ZipOutputStream zipOutputSteam) throws Exception { if (zipOutputSteam == null) return; File file = new File(folderString + fileString); if (file.isFile()) { ZipEntry zipEntry = new ZipEntry(fileString); FileInputStream inputStream = new FileInputStream(file); zipOutputSteam.putNextEntry(zipEntry); int len; byte[] buffer = new byte[4096]; while ((len = inputStream.read(buffer)) != -1) { zipOutputSteam.write(buffer, 0, len); } zipOutputSteam.closeEntry(); } else { String fileList[] = file.list(); if (fileList.length <= 0) { ZipEntry zipEntry = new ZipEntry(fileString + File.separator); zipOutputSteam.putNextEntry(zipEntry); zipOutputSteam.closeEntry(); } //子文件和递归 for (int i = 0; i < fileList.length; i++) { ZipFiles(folderString + fileString + "/", fileList[i], zipOutputSteam); } } }

5、文件列表排序

public static File[] orderByName(File file) { File[] files = file.listFiles(); Collections.sort(Arrays.asList(files)); return files; }

6、文件内容监听

讯享网/ *监听文件或文件夹变化 */ private FileObserver fileObserver = new FileObserver("监听路径") { @Override public void onEvent(int event, String path) {//path 触发事件的文件相对监听文件的路径 if (event == FileObserver.CREATE) { // 监控的文件夹下创建了子文件或文件夹 } else if(event == FileObserver.ACCESS) { // 文件被读取 } else if(event == FileObserver.ATTRIB) { // 权限 所有者 时间戳被修改 } else if(event == FileObserver.CLOSE_NOWRITE) { // 打开并关闭了文件夹(未修改) } else if(event == FileObserver.CLOSE_WRITE) { // 打开并关闭了文件夹(有修改) } else if(event == FileObserver.DELETE) { // 监控的文件夹下删除了子文件或文件夹 } else if(event == FileObserver.DELETE_SELF) { // 被监控的文件或文件夹被删除，监控停止 } else if(event == FileObserver.MODIFY) { // 文件被修改 } else if(event == FileObserver.MOVED_FROM) { // 被监控文件夹有子文件或文件夹移走 } else if(event == FileObserver.MOVED_TO) { // 被监控文件夹有子文件或文件夹被移入 } else if(event == FileObserver.MOVE_SELF) { // 被监控文件或文件夹被移动 } else if(event == FileObserver.OPEN) { // 文件或文件夹被打开 } else if(event == FileObserver.ALL_EVENTS) { // 以上所有事件 } } }; //开始监听 fileObserver.startWatching(); //结束监听 fileObserver.stopWatching();

7、文件重命名

/ * 文件重命名 * @param filePath 文件路径 * @param reName 文件新名 */ public void chageFileName(String filePath, String reName){ File file = new File(filePath); String path = filePath.substring(0, filePath.lastIndexOf("/") + 1) + reName; File newFile = new File(path); file.renameTo(newFile); }

8、复制文件和文件夹

讯享网/ * 复制单个文件 * @param oldPath String 原文件路径 * @param newPath String 复制后路径 * @return boolean */ public static void copyFile(String oldPath, String newPath) { try { int bytesum = 0; int byteread = 0; File oldfile = new File(oldPath); if (oldfile.exists()) { //文件存在时 InputStream inStream = new FileInputStream(oldPath); //读入原文件 FileOutputStream fs = new FileOutputStream(newPath); byte[] buffer = new byte[1444]; int length; while ( (byteread = inStream.read(buffer)) != -1) { bytesum += byteread; //字节数 文件大小 System.out.println(bytesum); fs.write(buffer, 0, byteread); } inStream.close(); } else { System.out.println("文件不存在"); } } catch (Exception e) { System.out.println("复制单个文件操作出错"); e.printStackTrace(); } } / * 复制整个文件夹内容 * @param oldPath String 原文件路径 * @param newPath String 复制后路径 * @return boolean */ public void copyFolder(String oldPath, String newPath) { try { (new File(newPath)).mkdirs(); //如果文件夹不存在 则建立新文件夹 File a=new File(oldPath); String[] file=a.list(); File temp=null; for (int i = 0; i < file.length; i++) { if(oldPath.endsWith(File.separator)){ temp=new File(oldPath+file[i]); } else{ temp=new File(oldPath+File.separator+file[i]); } if(temp.isFile()){ FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream(newPath + "/" + (temp.getName()).toString()); byte[] b = new byte[1024 * 5]; int len; while ( (len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); } if(temp.isDirectory()){//如果是子文件夹 copyFolder(oldPath+"/"+file[i],newPath+"/"+file[i]); } } } catch (Exception e) { System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } }

9、文件转Byte数组

/ * 文件转换byte[] * @param path 文件路径 * @return */ public static byte[] File2Bytes(String path) { File file = new File(path); int byte_size = 1024; byte[] b = new byte[byte_size]; try { FileInputStream fileInputStream = new FileInputStream(file); ByteArrayOutputStream outputStream = new ByteArrayOutputStream( byte_size); for (int length; (length = fileInputStream.read(b)) != -1;) { outputStream.write(b, 0, length); } fileInputStream.close(); outputStream.close(); return outputStream.toByteArray(); } catch (IOException e) { e.printStackTrace(); } return null; }

10、文件解压

讯享网public class UnzipFileUtils { public static final String TAG = "UnzipFileUtils"; private UnzipManagerCallBack mUnzipCallback; private static UnzipFileUtils instance; private File zipFile; // 已解压文件大小 double temp = 0; long l; private int mProgress = 0; private boolean unzipError = false; private int unzipResult = -1; private UnzipFileUtils() { } public static synchronized UnzipFileUtils getInstance() { if (null == instance) { instance = new UnzipFileUtils(); } return instance; } @RequiresApi(api = Build.VERSION_CODES.N) public void unzipFile(String zipPath, String descDir, FotaManagerImpl.FotaManagerCallBack unzipCallback) { temp = 0; mProgress = 0; mUnzipCallback = unzipCallback; mUnzipCallback.onStart(); zipFile = new File(zipPath); l = getZipTrueSize(zipPath); try { if (!zipFile.exists()) { mUnzipCallback.onError(Constant.ERROR_UNZIP); Log.d(TAG, "unzipFile: the compressed package does not exist."); } File pathFile = new File(descDir); if (!pathFile.exists()) { pathFile.mkdirs(); } InputStream input = new FileInputStream(zipPath); unzipWithStream(input, descDir); } catch (Exception e) { e.printStackTrace(); } } @RequiresApi(api = Build.VERSION_CODES.N) private void unzipWithStream(InputStream inputStream, String descDir) { if (!descDir.endsWith(File.separator)) { descDir = descDir + File.separator; } try { ZipInputStream zipInputStream = new ZipInputStream(inputStream, Charset.forName("GBK")); ZipEntry zipEntry; while ((zipEntry = zipInputStream.getNextEntry()) != null) { String zipEntryNameStr = zipEntry.getName(); String zipEntryName = zipEntry.getName(); if (zipEntryNameStr.contains("/")) { String str1 = zipEntryNameStr.substring(0, zipEntryNameStr.indexOf("/")); zipEntryName = zipEntryNameStr.substring(str1.length() + 1); } String outPath = (descDir + zipEntryName).replace("\\\\", "/"); File outFile = new File(outPath.substring(0, outPath.lastIndexOf('/'))); if (!outFile.exists()) { outFile.mkdirs(); } if (new File(outPath).isDirectory()) { continue; } writeFile(outPath, zipInputStream); zipInputStream.closeEntry(); } inputStream.close(); mUnzipCallback.onComplete(); Log.d(TAG, "===== unzip onComplete() ====="); } catch (IOException e) { e.printStackTrace(); mUnzipCallback.onError(Constant.ERROR_UNZIP); } } private void writeFile(String filePath, ZipInputStream zipInputStream) { try { OutputStream outputStream = new FileOutputStream(filePath); byte[] bytes = new byte[4096]; int len; while ((len = zipInputStream.read(bytes)) != -1) { outputStream.write(bytes, 0, len); temp += len; setProgress(); } } catch (IOException e) { e.printStackTrace(); mUnzipCallback.onError(Constant.ERROR_UNZIP); } } private void setProgress() { //计算百分比 double t = temp / l; int progress = (int) (t * 100); if (progress != mProgress) { mProgress = progress; mUnzipCallback.onProgress("解压升级包", progress); } } public long getZipTrueSize(String filePath) { long size = 0; ZipFile f; try { f = new ZipFile(filePath); Enumeration<? extends ZipEntry> en = f.entries(); while (en.hasMoreElements()) { size += en.nextElement().getSize(); } } catch (IOException e) { e.printStackTrace(); } return size; } }