With this example we are going to demonstrate how to write a byte array to a file using a FileOutputStream. The FileOutputStream is an output stream for writing data to a File or to a FileDescriptor. In short, to write a byte array to a file using a FileOutputStream you should:
- Create a new File instance by converting the given pathname string into an abstract pathname.
- Create a new FileOutputStream to write to the file represented by the specified File object.
- Write bytes from a specified byte array to this file output stream, using
write(byte[] b)API method. - Don’t forget to close the stream, using its
close()API method.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class WriteByteArrayToFileWithileOutputStream {
public static void main(String[] args) {
String s = "Java Code Geeks - Java Examples";
File file = new File("outputfile.txt");
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file);
// Writes bytes from the specified byte array to this file output stream
fos.write(s.getBytes());
}
catch (FileNotFoundException e) {
System.out.println("File not found" + e);
}
catch (IOException ioe) {
System.out.println("Exception while writing file " + ioe);
}
finally {
// close the streams using close method
try {
if (fos != null) {
fos.close();
}
}
catch (IOException ioe) {
System.out.println("Error while closing stream: " + ioe);
}
}
}
}
This was an example of how to write a byte array to a file using a FileOutputStream in Java.
