Java FileInputStream Read readFile(File file, boolean compress)

Description

Reads a file's contents into a byte array.

License

Open Source License

Parameter

Parameter	Description
pathname	The file path to retrieve the file from
compress	If set to true, the returned byte stream is compressed

Exception

Parameter	Description
IOException	an exception

Return

a byte array of the returned file

Declaration

public static byte[] readFile(File file, boolean compress) throws IOException 

Method Source Code

//package com.java2s;
/*//  w w w . ja  va  2  s. c  om
 *  $URL$
 *  $Revision$
 *  $Author$
 *  $Date$
 *  
 *  $Copyright-Start$
 *
 *  Copyright (c) 20167
 *  Sam Corporation
 *  All Rights Reserved
 *
 *  This software is furnished under a corporate license for use on a
 *  single computer system and can be copied (with inclusion of the
 *  above copyright) only for use on such a system.
 *
 *  The information in this document is subject to change without notice
 *  and should not be construed as a commitment by Sam Corporation.
 *
 *  Sam Corporation assumes no responsibility for the use of the
 *  software described in this document on equipment which has not been
 *  supplied or approved by Sam Corporation.
 *
 *  $Copyright-End$
 */

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.GZIPOutputStream;

public class Main {
    /**
     * Reads a file's contents into a byte array.  This method should not be used
     * to read very large files, as the entire file is read into memory. 
     * @param pathname The file path to retrieve the file from
     * @param compress If set to true, the returned byte stream is compressed
     * @return a byte array of the returned file
     * @throws IOException
     */
    public static byte[] readFile(File file, boolean compress) throws IOException {

        FileInputStream in = new FileInputStream(file);

        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            OutputStream out;
            if (compress) {
                out = new GZIPOutputStream(buffer);
            } else {
                out = buffer;
            }

            copy(in, out);

            out.close();
            return buffer.toByteArray();
        } finally {
            try {
                in.close();
            } catch (IOException ignore) {
                // ignore
            }
        }
    }

    public static void copy(InputStream in, OutputStream out) throws IOException {
        byte[] tmp = new byte[1024];
        while (true) {
            int bytesRead = in.read(tmp, 0, tmp.length);
            if (bytesRead == -1) {
                break;
            }
            out.write(tmp, 0, bytesRead);
        }
        out.flush();
    }
}

Related

1. readFile(File file)
2. readFile(File file)
3. readFile(File file)
4. readFile(File file)
5. readFile(File file)
6. readFile(File file, int size)
7. readFile(File file, OutputStream output)
8. readFile(File file, String encoding)
9. readFile(File file, String encoding)