Java Text File Read readTextFileFast(final File file)

Description

read Text File Fast

License

Apache License

Declaration

public static String readTextFileFast(final File file) 

Method Source Code

//package com.java2s;
/*#######################################################
 *
 *   Maintained by Gregor Santner, 2017-
 *   https://gsantner.net//*from w ww.  ja  va  2 s  .  c  om*/
 *
 *   License: Apache 2.0
 *  https://github.com/gsantner/opoc/#licensing
 *  https://www.apache.org/licenses/LICENSE-2.0
 *
#########################################################*/

import java.io.BufferedInputStream;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

import java.io.IOException;
import java.io.InputStream;

import java.util.ArrayList;

public class Main {
    private static final int BUFFER_SIZE = 4096;

    public static String readTextFileFast(final File file) {
        try {
            return new String(readCloseBinaryStream(new FileInputStream(file)));
        } catch (FileNotFoundException e) {
            System.err.println("readTextFileFast: File " + file + " not found.");
        }
        return "";
    }

    public static byte[] readCloseBinaryStream(final InputStream stream, int byteCount) {
        final ArrayList<String> lines = new ArrayList<>();
        BufferedInputStream reader = null;
        byte[] buf = new byte[byteCount];
        int totalBytesRead = 0;
        try {
            reader = new BufferedInputStream(stream);
            while (totalBytesRead < byteCount) {
                int bytesRead = reader.read(buf, totalBytesRead, byteCount - totalBytesRead);
                if (bytesRead > 0) {
                    totalBytesRead = totalBytesRead + bytesRead;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return buf;
    }

    public static byte[] readCloseBinaryStream(final InputStream stream) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try {
            byte[] buffer = new byte[BUFFER_SIZE];
            int read;
            while ((read = stream.read(buffer)) != -1) {
                baos.write(buffer, 0, read);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (stream != null) {
                try {
                    stream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return baos.toByteArray();
    }
}

Related

1. readTextFile(final DataInputStream is)
2. readTextFile(final String path, final String enc)
3. readTextFile(InputStream inStream)
4. readTextFile(String fileName)
5. readTextFile(String fn)