Java reads local disks and removable drive disks and copies files

1. Differentiate between local disks, removable disks, and drive disks

The code is as follows:

Copy code

Package com. lvjava;   Import java. io. File;   Import javax. swing. filechooser. FileSystemView;   Public class FileSystemTest {   Private final static String localDiskName = "local disk "; Private final static String removableDiskName = "removable disk "; Private final static String enLocalDiskName = "Local Disk "; Private final static String enRemovableDiskName = "Removable Disk ";   /** * @ Param args */ Public static void main (String [] args ){ // TODO Auto-generated method stub FileSystemView fileSystemView = FileSystemView. getFileSystemView (); File [] roots = File. listRoots (); For (File file: roots ){ String diskName = fileSystemView. getSystemTypeDescription (file ); System. out. println (diskName ); If (diskName. startsWith (localDiskName) | DiskName. startsWith (enLocalDiskName) {// when the disk is a local disk or a removable disk // Do something } Else if (diskName. startsWith (removableDiskName) | DiskName. startsWith (enRemovableDiskName )){ // Do something             }         }     }   }

The output of the running code is as follows:
Local Disk
Local Disk
Local Disk
Local Disk
CD drive
CD drive
Removable disk

2. Copy a file using Java code

The code is as follows:

Copy code

/** * Moving a File to Another Directory * @ Param srcFile eg: c: windowsabc.txt * @ Param destPath eg: c: temp * @ Return success */ Public static boolean move (String srcFile, String destPath ){ // File (or directory) to be moved File file = new File (srcFile );       // Destination directory File dir = new File (destPath );       // Move file to new directory and return result Return file. renameTo (new File (dir, file. getName ())); }

The following is a class for copying folders and files.

The code is as follows:

Copy code

Package com. xuanwu. mtoserver. util; Import java. io .*; /** * @ Author Toby: copy a folder or folder */ Public class FileUtil { Public static void main (String args []) throws IOException { // Source folder String url1 = "D:/user/test /"; // Target folder String url2 = "D:/user/testcopy /"; // Create the target folder (New File (url2). mkdirs (); // Obtain the current file or directory of the source folder File [] file = (new File (url1). listFiles (); For (int I = 0; I <file. length; I ++ ){ If (file [I]. isFile ()){ // Copy an object String type = file [I]. getName (). substring (file [I]. getName (). lastIndexOf (".") + 1 ); If (type. equalsIgnoreCase ("txt") // transcoding CopyFile (file [I], new File (url2 + file [I]. getName (), MTOServerConstants. CODE_UTF_8, MTOServerConstants. CODE_GBK ); Else CopyFile (file [I], new File (url2 + file [I]. getName ()));             } If (file [I]. isDirectory ()){ // Copy the Directory String sourceDir = url1 + File. separator + file [I]. getName (); String targetDir = url2 + File. separator + file [I]. getName (); CopyDirectiory (sourceDir, targetDir );             }         }     } // Copy an object Public static void copyFile (File sourceFile, File targetFile) throws IOException { BufferedInputStream inBuff = null; BufferedOutputStream outBuff = null; Try { // Create a file input stream and buffer it InBuff = new BufferedInputStream (new FileInputStream (sourceFile )); // Create a file output stream and buffer it OutBuff = new BufferedOutputStream (new FileOutputStream (targetFile )); // Buffer array Byte [] B = new byte [1, 1024*5]; Int len; While (len = inBuff. read (B ))! =-1 ){ OutBuff. write (B, 0, len );             } // Refresh the buffer output stream OutBuff. flush (); } Finally { // Close the stream If (inBuff! = Null) InBuff. close (); If (outBuff! = Null) OutBuff. close ();         }     } // Copy a folder Public static void copyDirectiory (String sourceDir, String targetDir) throws IOException { // Create a target Directory (New File (targetDir). mkdirs (); // Obtain the current file or directory of the source folder File [] file = (new File (sourceDir). listFiles (); For (int I = 0; I <file. length; I ++ ){ If (file [I]. isFile ()){ // Source file File sourceFile = file [I]; // Target file File targetFile = new File (targetDir). getAbsolutePath () + File. separator + file [I]. getName ()); CopyFile (sourceFile, targetFile );             } If (file [I]. isDirectory ()){ // Prepare the copied source folder String dir1 = sourceDir + "/" + file [I]. getName (); // The target folder to be copied String dir2 = targetDir + "/" + file [I]. getName (); CopyDirectiory (dir1, dir2 );             }         }     } /**      * * @ Param srcFileName * @ Param destFileName * @ Param srcCoding * @ Param destCoding * @ Throws IOException */ Public static void copyFile (File srcFileName, File destFileName, String srcCoding, String destCoding) throws IOException {// Convert a File to a GBK File BufferedReader br = null; BufferedWriter bw = null; Try { Br = new BufferedReader (new InputStreamReader (new FileInputStream (srcFileName), srcCoding )); Bw = new BufferedWriter (new OutputStreamWriter (new FileOutputStream (destFileName), destCoding )); Char [] cbuf = new char [2, 1024*5]; Int len = cbuf. length; Int off = 0; Int ret = 0; While (ret = br. read (cbuf, off, len)> 0 ){ Off + = ret; Len-= ret;             } Bw. write (cbuf, 0, off ); Bw. flush (); } Finally { If (br! = Null) Br. close (); If (bw! = Null) Bw. close ();         }     } /**      * * @ Param filepath * @ Throws IOException */ Public static void del (String filepath) throws IOException { File f = new File (filepath); // defines the File path If (f. exists () & f. isDirectory () {// Determine whether the file is a directory or not. If (f. listFiles (). length = 0) {// delete a file directly if no file exists in the directory F. delete (); } Else {// If yes, put the file into an array and determine whether there is a sub-directory File delFile [] = f. listFiles (); Int I = f. listFiles (). length; For (int j = 0; j <I; j ++ ){ If (delFile [j]. isDirectory ()){ Del (delFile [j]. getAbsolutePath (); // recursively call the del method and obtain the subdirectory path                     } DelFile [j]. delete (); // delete an object                 }             }         }     } }