Reading a File into a Byte Array - Java File Path IO

Java examples for File Path IO:Binary File

  1. HOME
  2. Java
  3. File Path IO
  4. Binary File

Description

Reading a File into a Byte Array

Demo Code

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class Main {
  public static byte[] getBytesFromFile(File file) throws IOException {
    InputStream is = new FileInputStream(file);

    // Get the size of the file
    long length = file.length();

    if (length > Integer.MAX_VALUE) {
      // File is too large
    }//from ww  w. ja  va 2 s  . c o m

    byte[] bytes = new byte[(int) length];

    int offset = 0;
    int numRead = 0;
    while (offset < bytes.length
        && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
      offset += numRead;
    }

    // Ensure all the bytes have been read in
    if (offset < bytes.length) {
      throw new IOException("Could not completely read file " + file.getName());
    }

    is.close();
    return bytes;
  }
}

Related Tutorials