File processing tool

File processing tool

File Processing:

Common Operations:

Obtain the absolute path and relative path of the file or folder. String path = File. getPath (); // relative path String path = File. getAbsoultePath (); // obtain the parent directory String parentPath = File of the File or folder from the absolute path. getParent (); get the Name of the File or folder String Name = File. getName (); create a File or folder File. mkDir (); // create a folder File. createNewFile (); // create a File to determine whether it is a File or a folder File. isDirectory () lists all the files in the folder and the folder name File [] files = File. listFiles (); Modify the folder and File name. renameTo (dest); delete a folder or File. delete ();

Added:

// Add //................................... ......... demarcation Line ...................................... ......... /*** determine whether the specified File exists * @ param filePath * @ return */public static boolean isFileExist (String filePath) {file File = new file (filePath); return File. exists ();}/*** create a file. If the file is successfully created, true * @ param filePath * @ return */public static boolean createFile (String filePath) is returned) {try {File file = new File (filePath ); If (! File. exists () {if (! File. getParentFile (). exists () {// create a folder file. getParentFile (). mkdirs ();} // create an empty file return file. createNewFile () ;}} catch (IOException e) {e. printStackTrace ();} return true ;} /*** write a specified file from an input stream * @ param FilePath: Path of the file to be created * @ param in * @ return */public static boolean writeFile (String FilePath, inputStream in) {try {// if the file is successfully created, continue; otherwise, false if (! CreateFile (FilePath) {return false;} FileOutputStream fos = new FileOutputStream (FilePath); int readCount = 0; int len = 1024; byte [] buffer = new byte [len]; while (readCount = in. read (buffer ))! =-1) {fos. write (buffer, 0, readCount);} fos. flush (); if (null! = Fos) {fos. close (); fos = null;} if (null! = In) {in. close (); in = null;} return true;} catch (IOException e) {e. printStackTrace ();} return false ;} /*** write bitmap to the file in the specified path * @ param bitmap Bitmap object * @ param destPath specified path * @ param quality compression rate, for example, when quality is set to 30, indicates compression of 70%; quality = 100 indicates not compression */public static void writeImage (Bitmap bitmap, String destPath, int quality) {try {FileAECS. deleteFile (destPath); if (FileAECS. createFile (destPath) {F IleOutputStream out = new FileOutputStream (destPath); if (bitmap. compress (Bitmap. compressFormat. JPEG, quality, out) {out. flush (); out. close (); out = null ;}} catch (IOException e) {e. printStackTrace ();}} /*** write data to a file ** @ param destFilePath path of the file to be created * @ param data file data to be written * @ param startPos start offset * @ param length the length of the written data * @ return returns true if the file is successfully written, false */public static boolean writeFi Le (String destFilePath, byte [] data, int startPos, int length) {try {if (! CreateFile (destFilePath) {return false;} FileOutputStream fos = new FileOutputStream (destFilePath); fos. write (data, startPos, length); fos. flush (); if (null! = Fos) {fos. close (); fos = null;} return true;} catch (FileNotFoundException e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();} return false ;}

Delete:

// Delete //................................... ......... demarcation Line ...................................... ......... /*** delete all files in the specified folder path, including the folder itself * @ param filePath folder path */public static void deleteAll (String filePath) {File file = new File (filePath); deleteFiles (file);}/*** delete all files in the specified folder, including the folder itself * @ param file File instance */public static void deleteFiles (File file) {if (file. isDirectory () {File [] listFiles = file. listFiles (); for (int I = 0; I <listFiles. length; I ++) {deleteFiles (listFiles [I]) ;}} file. delete ();} /*** delete a specified file or folder * @ param filePath Path of the file or folder to be deleted * @ return */public static boolean deleteFile (String filePath) {try {File file = new File (filePath); if (file. exists () {return file. delete () ;}} catch (Exception e) {e. printStackTrace ();} return false ;}

Modify:

// Modify //................................... ......... demarcation Line ...................................... ........ /*** modify all file suffixes in a specified folder in batches * @ param File * @ param oldSuffix * @ param newSuffix */public static void ReFileNameSuffix (file, String oldSuffix, String newSuffix) {if (file. isDirectory () {File [] listFiles = file. listFiles (); for (int I = 0; I <listFiles. length; I ++) {ReFileNameSuffix (listFiles [I], oldSuffix, newSuffix) ;}} else {file. renameTo (new File (file. getPath (). replace (oldSuffix, newSuffix )));}} /*** copy an object to another place * @ param sourceFile source file address * @ param destFile Destination Address * @ param shouldOverlay whether to overwrite * @ return */public static boolean copyFiles (string sourceFile, string destFile, boolean shouldOverlay) {try {if (shouldOverlay) {deleteFile (destFile);} FileInputStream fi = new FileInputStream (sourceFile); writeFile (destFile, fi); return true ;} catch (FileNotFoundException e) {e. printStackTrace ();} return false ;}

Read:

// Read //................................... ......... demarcation Line ...................................... ......... /*** read the specified file, returns the data in byte array form ** @ param filePath the path name of the file to be read * @ return byte array form data */public static byte [] readFile (String filePath) {try {if (isFileExist (filePath) {FileInputStream fi = new FileInputStream (filePath); return readInputStream (fi) ;}} catch (FileNotFoundException e) {e. printStackTr Ace ();} return null;}/*** reads data from a quantity stream and returns data in byte array form. * It is important to note that this method is generally used to read data from a local file, but it is often used for network operations (Network instability, available () method issues ). Therefore, this method should not be used for network streams. ** @ Param in the input stream to be read * @ return * @ throws java. io. IOException */public static byte [] readInputStream (InputStream in) {try {ByteArrayOutputStream OS = new ByteArrayOutputStream (); byte [] B = new byte [in. available ()]; int length = 0; while (length = in. read (B ))! =-1) {OS. write (B, 0, length);} B = OS. toByteArray (); in. close (); in = null; OS. close (); OS = null; return B;} catch (IOException e) {e. printStackTrace ();} return null;}/*** read network stream ** @ param in * @ return */public static byte [] readNetWorkInputStream (InputStream in) {ByteArrayOutputStream OS = null; try {OS = new ByteArrayOutputStream (); int readCount = 0; int len = 1024; byte [] buffer = New byte [len]; while (readCount = in. read (buffer ))! =-1) {OS. write (buffer, 0, readCount);} in. close (); in = null; return OS. toByteArray ();} catch (IOException e) {e. printStackTrace ();} finally {if (null! = OS) {try {OS. close ();} catch (IOException e) {e. printStackTrace ();} OS = null;} return null;}/*** read file data from resource raw, which can only be read, you cannot write * @ param Context * @ param test, for example, R. raw. test * @ param Charset encoding format, such as GBK, UTF-8, Unicode * @ return String */public static String getRawTest (Context, int test, String Charset) {String = null; try {// obtain the Raw data stream InputStream in = Context in the resource. getResources (). openRawResource (test); // get the data size int length = in. available (); // cache size byte [] buffer = new byte [length]; // read data in. read (buffer); // select the appropriate encoding type based on test.txt. If not adjusted, the String = EncodingUtils will be garbled. getString (buffer, Charset); // close in. close ();} catch (Exception e) {e. printStackTrace ();} return String;}/*** reads file data from the resource's asset and can only read, cannot Write * @ param Context * @ param fileName file name * @ param Charset encoding format, such as GBK, UTF-8, Unicode * @ return String */public static String getAssetTest (Context, string fileName, String Charset) {String = null; try {// obtain the asset data stream InputStream in = Context in the resource. getResources (). getAssets (). open (fileName); // get the data size int length = in. available (); // cache size byte [] buffer = new byte [length]; // read data in. read (buffer); // select the appropriate encoding type based on test.txt. If not adjusted, the String = EncodingUtils will be garbled. getString (buffer, Charset);} catch (Exception e) {e. printStackTrace ();} return String ;}

SD card processing:

// SD card related //.................................. .......... demarcation Line ......................................... /*** determine whether the SD card is mounted normally * @ return true normal mounting */public static boolean hasSDCard () {if (Environment. getExternalStorageState (). equals (Environment. MEDIA_MOUNTED) {return true;} else {return false;}/*** get the SD card root directory:/sdcard * @ return File */public static File getSDCardRoot () {if (hasSDCard () {return Environment. getExternalStorageDirectory ();} return null ;}

Obtain:

// Get //................................... ......... demarcation Line ......................................... /*** get the folder size * @ param file File instance * @ return long in the unit of M * @ throws Exception */public static long getFolderSize (File file) throws Exception {long size = 0; File [] fileList = file. listFiles (); for (int I = 0; I <fileList. length; I ++) {if (fileList [I]. isDirectory () {size = size + getFolderSize (fileList [I]);} else {size = size + fileList [I]. length () ;}} return size/(1024*1023 );} /*** obtain the relative path of a file or folder * @ param File * @ return String */public static String getFilePath (file) {String str = File. getPath (); return str;}/*** obtain the absolute path of a file or folder * @ param File * @ return String */public static String getFileAbsoultePath (file) {String str = file. getAbsolutePath (); return str ;}