Java Text File Read by Charset read(File file, Charset charset)

Description

read

License

Open Source License

Declaration

static String read(File file, Charset charset) throws IOException 

Method Source Code

//package com.java2s;
/*/*  ww w  .j  ava2s .  com*/
 * This file is part of DeltaEssentials.
 *
 * DeltaEssentials is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * DeltaEssentials is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with DeltaEssentials.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.StandardOpenOption;

public class Main {
    static String read(File file) throws IOException {
        return read(file, StandardCharsets.UTF_8);
    }

    static String read(File file, Charset charset) throws IOException {
        FileLock lock = null;
        FileChannel fileChannel = null;

        try {
            fileChannel = FileChannel.open(file.toPath(), StandardOpenOption.READ, StandardOpenOption.WRITE);

            // Lock the file
            lock = fileChannel.lock();

            ByteBuffer buffer = ByteBuffer.allocate((int) fileChannel.size());
            fileChannel.read(buffer);

            return new String(buffer.array(), charset);
        } finally {
            // Release the file lock
            if (lock != null) {
                try {
                    lock.release();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }

            // Close the file channel
            if (fileChannel != null) {
                try {
                    fileChannel.close();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }

            // Note: Do NOT return from a finally-block
        }
    }
}

Related

1. newReader(File file, Charset charset)
2. newReader(InputStream input, Charset encoding)
3. newReader(ReadableByteChannel ch, Charset cs)
4. newUTF8CharSetReader(String filename)
5. openNewCompressedInputReader(final InputStream inputStream, final Charset charset)
6. read(InputStream _is, CharsetDecoder _decoder)
7. read(InputStream in, Charset charset)
8. read(InputStream in, Charset cs, Appendable appendable, int capacity)
9. read(InputStream in, String charsetName)