Copy files using Java IO API : File Commands « File Input Output « Java

1. Java
2. File Input Output
3. File Commands

Copy files using Java IO API

import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; publicclass FileCopy { publicstaticvoid main(String[] args) { try { copy("fromFile.txt", "toFile.txt"); } catch (IOException e) { System.err.println(e.getMessage()); } } publicstaticvoid copy(String fromFileName, String toFileName) throws IOException { File fromFile = newFile(fromFileName); File toFile = newFile(toFileName); if (!fromFile.exists()) thrownew IOException("FileCopy: " + "no such source file: " + fromFileName); if (!fromFile.isFile()) thrownew IOException("FileCopy: " + "can't copy directory: " + fromFileName); if (!fromFile.canRead()) thrownew IOException("FileCopy: " + "source file is unreadable: " + fromFileName); if (toFile.isDirectory()) toFile = newFile(toFile, fromFile.getName()); if (toFile.exists()) { if (!toFile.canWrite()) thrownew IOException("FileCopy: " + "destination file is unwriteable: " + toFileName); System.out.print("Overwrite existing file " + toFile.getName() + "? (Y/N): "); System.out.flush(); BufferedReader in = new BufferedReader(new InputStreamReader( System.in)); String response = in.readLine(); if (!response.equals("Y") && !response.equals("y")) thrownew IOException("FileCopy: " + "existing file was not overwritten."); } else { String parent = toFile.getParent(); if (parent == null) parent = System.getProperty("user.dir"); File dir = newFile(parent); if (!dir.exists()) thrownew IOException("FileCopy: " + "destination directory doesn't exist: " + parent); if (dir.isFile()) thrownew IOException("FileCopy: " + "destination is not a directory: " + parent); if (!dir.canWrite()) thrownew IOException("FileCopy: " + "destination directory is unwriteable: " + parent); } FileInputStream from = null; FileOutputStream to = null; try { from = new FileInputStream(fromFile); to = new FileOutputStream(toFile); byte[] buffer = newbyte[4096]; int bytesRead; while ((bytesRead = from.read(buffer)) != -1) to.write(buffer, 0, bytesRead); // write  } finally { if (from != null) try { from.close(); } catch (IOException e) { ; } if (to != null) try { to.close(); } catch (IOException e) { ; } } } } 

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