With this example we are going to demonstrate how to copy a binary file using theFileInputStream and theFileOutputStream. In short, to copy a binary file with streams you should:

• Create a newFileInputStream, by opening a connection to an actual file, the file named by the path source name in the file system.
• Create a newFileOutputStream to write to the file with the specified target name.
• Useread(byte[] b) API method of FileInputStream to read up to b.length bytes of data from this input stream into an array of bytes.
• Usewrite(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:

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 filewhile ((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 methodtry {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.

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