Java FileInputStream Read readFileAtOnce(final File file)

Description

Reads the contents of the file at once and returns the byte array.

License

Open Source License

Parameter

Parameter	Description
file	a java.io.File object.

Exception

Parameter	Description

Return

an array of byte.

Declaration

public static byte[] readFileAtOnce(final File file) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.File;
import java.io.FileInputStream;

import java.io.IOException;

public class Main {
    /**// ww w  .ja va2  s  .c om
     * Reads the contents of the file at once and returns the byte array.
     *
     * @param file a {@link java.io.File} object.
     * @throws java.io.IOException if any.
     * @return an array of byte.
     */
    public static byte[] readFileAtOnce(final File file) throws IOException {
        final FileInputStream fIn = new FileInputStream(file);
        return readFileAtOnce(fIn);
    }

    /**
     * Reads the contents of the file at once and returns the byte array.
     *
     * @param filename
     *            name of the file.
     * @throws java.io.IOException if any.
     * @return an array of byte.
     */
    public static byte[] readFileAtOnce(final String filename) throws IOException {
        final FileInputStream fIn = new FileInputStream(filename);
        return readFileAtOnce(fIn);
    }

    /**
     * Reads the contents of the file input stream. (Why not an InputStream btw?).
     * 
     * @param fIn
     * @return
     * @throws IOException
     */
    private static byte[] readFileAtOnce(final FileInputStream fIn) throws IOException {
        final byte[] ret = new byte[fIn.available()];
        fIn.read(ret);
        fIn.close();
        return ret;
    }
}

Related

1. readFileAsInputStream(File file)
2. readFileAsInputStream(String fileName)
3. readFileAsProperties(File file)
4. readFileAsResource(String fileName)
5. ReadFileAsUtf8String(String filePath)
6. readFileBinaries(File file)
7. readFileBinary(String filename)
8. readFileBytes(File file)
9. readFileBytes(File file)