As we know whenever it comes to writing over a file, write() method of the File class comes into play but here we can not use it in order to convert that byte into a file. In order to convert a byte array to a file, we will be using a method named the getBytes() method of String class.
Implementation: Convert a String into a byte array and write it in a file.
Example:
Java
// Java Program to convert Byte Array to File// Importing required classesimport java.io.File;import java.io.FileOutputStream;import java.io.OutputStream;// Main classpublic class GFG { // Path of a file static String FILEPATH = ""; static File file = new File(FILEPATH); // Method 1 // To write the bytes into a file static void writeByte(byte[] bytes) { // Try block to check for exceptions try { // Initialize a pointer in file // using OutputStream OutputStream os = new FileOutputStream(file); // Starting writing the bytes in it os.write(bytes); // Display message onconsole for successful // execution System.out.println("Successfully" + " byte inserted"); // Close the file connections os.close(); } // Catch block to handle the exceptions catch (Exception e) { // Display exception on console System.out.println("Exception: " + e); } } // Method 2 // Main driver method public static void main(String args[]) { // Input string String string = "GeeksForGeeks" + " - A Computer Science" + " Portal for geeks"; // Getting byte array from string // using getBytes() method byte[] bytes = string.getBytes(); // Calling Method 1 to // convert byte array to file writeByte(bytes); }} |
Output: On console
Successfully byte inserted
Now let us also discuss the use-case in order how to write Integer, Double, Character Values in the File (using Wrapper Class)
Example:
Java
// Java Program to Convert Integer, Character and Double// Types into Bytes and Writing it in a File// Importing required classesimport java.io.File;import java.io.FileOutputStream;import java.io.OutputStream;// Main classpublic class GFG { // Path of a file static String FILEPATH = ""; // Getting the file via creating File class object static File file = new File(FILEPATH); // Method 1 // Writing the bytes into a file static void writeByte(byte[] byteInt, byte[] byteChar, byte[] byteDouble) { // Try block to check for exceptions try { // Initialize a pointer in file // using OutputStream class object OutputStream os = new FileOutputStream(file); // Starting writing the bytes in it // Writing int value os.write(byteInt); // Writing char value os.write(byteChar); // Writing double value os.write(byteDouble); // Display message for successful execution of // program System.out.println( "Successfully byte inserted"); // Close the file connections // using close() method os.close(); } // Catch block to handle exceptions catch (Exception e) { // Display message when exceptions occurs System.out.println("Exception: " + e); } } // Method 2 // Main driver method public static void main(String args[]) { // Declaring and initializing data types int num = 56; char ch = 's'; double dec = 78.9; // Inserting integer value byte[] byteInt = Integer.toString(num).getBytes(); // Inserting character value byte[] byteChar = Character.toString(ch).getBytes(); // Inserting double value byte[] byteDouble = Double.toString(dec).getBytes(); // Calling Method 1 to // write the bytes into a file writeByte(byteInt, byteChar, byteDouble); }} |
Output: On console
Successfully byte inserted
