With this example we are going to demonstrate how to copy a binary file using the FileInputStream and the FileOutputStream. In short, to copy a binary file with streams you should:
- Create a new FileInputStream, by opening a connection to an actual file, the file named by the path source name in the file system.
- Create a new FileOutputStream to write to the file with the specified target name.
- Use
read(byte[] b)API method of FileInputStream to read up to b.length bytes of data from this input stream into an array of bytes. - Use
write(byte[] b, int off, int len)API method of FileOutputStream to write len bytes from the specified byte array starting at offset off to this file output stream.
Let’s take a look at the code snippet that follows:
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | package com.javacodegeeks.snippets.core;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class CopyBinaryFileWithStreams { public static void main(String[] args) { String sourceFile = "input.dat"; String destFile = "output.dat"; FileInputStream fis = null; FileOutputStream fos = null; try { fis = new FileInputStream(sourceFile); fos = new FileOutputStream(destFile); byte[] buffer = new byte[1024]; int noOfBytes = 0; System.out.println("Copying file using streams"); // read bytes from source file and write to destination file while ((noOfBytes = fis.read(buffer)) != -1) { fos.write(buffer, 0, noOfBytes); } } catch (FileNotFoundException e) { System.out.println("File not found" + e); } catch (IOException ioe) { System.out.println("Exception while copying file " + ioe); } finally { // close the streams using close method try { if (fis != null) { fis.close(); } if (fos != null) { fos.close(); } } catch (IOException ioe) { System.out.println("Error while closing stream: " + ioe); } } }} |
This was an example of how to copy a binary file with streams in Java.
