Java File to Byte Array toByteArray(File file)

Description

to Byte Array

License

Apache License

Declaration

public static byte[] toByteArray(File file) 

Method Source Code

//package com.java2s;
/*/* w  w  w. j  a  v a2s.c om*/
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.MessageFormat;

public class Main {
    public static byte[] toByteArray(File file) {
        FileInputStream inputStream = null;
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        try {
            inputStream = new FileInputStream(file);
            int read = 0;
            byte[] buffer = new byte[4096];
            while ((read = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, read);
            }
            outputStream.flush();
            return outputStream.toByteArray();
        } catch (FileNotFoundException e) {
            throw new IllegalArgumentException(MessageFormat.format("File {0} does not exist!", file.getName()), e);
        } catch (IOException e) {
            throw new IllegalStateException(MessageFormat.format("Couldn't read file {0}!", file.getName()), e);
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace(); // FIXME should we care?
                }
            }
        }
    }
}

Related

1. getBytesFromFile(String filename)
2. getBytesFromFile(String fileName)
3. getBytesFromFile(String filename)
4. getBytesFromFile(String filepath)
5. getBytesFromFile(String filePath)