get Bytes From File - Java File Path IO

Java examples for File Path IO:Binary File

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Description

get Bytes From File

Demo Code


//package com.java2s;

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

public class Main {
    public static void main(String[] argv) throws Exception {
        File file = new File("Main.java");
        System.out.println(java.util.Arrays
                .toString(getBytesFromFile(file)));
    }// w w w. ja va2  s  .co  m

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

        long length = file.length();

        if (length > Integer.MAX_VALUE) {
            // File is too large
        }

        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;
        }

        if (offset < bytes.length) {
            throw new IOException("Could not completely read file "
                    + file.getName());
        }

        is.close();
        return bytes;
    }
}

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