Java File Read by Charset getContent(File file, String charsetName)

Description

Gets the content of the given File .

License

Open Source License

Parameter

Parameter	Description
file	the File
charsetName	The name of a supported java.nio.charset.Charset </code>charset<code>

Exception

Parameter	Description
IOException	if the File can't be read

Return

a of the content of the given

Declaration

public static String getContent(File file, String charsetName) throws IOException 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2015 Obeo.//  w  ww.j  a v a  2  s  .com
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Obeo - initial API and implementation and/or initial documentation
 *    ...
 *******************************************************************************/

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class Main {
    /**
     * Gets the content of the given {@link File}.
     * 
     * @param file
     *            the {@link File}
     * @param charsetName
     *            The name of a supported {@link java.nio.charset.Charset </code>charset<code>}
     * @return a {@link String} of the content of the given {@link File}
     * @throws IOException
     *             if the {@link File} can't be read
     */
    public static String getContent(File file, String charsetName) throws IOException {
        if (!file.exists()) {
            throw new IOException(file.getAbsolutePath() + " doesn't exists.");
        } else if (file.isDirectory()) {
            throw new IOException(file.getAbsolutePath() + " is a directory.");
        } else if (!file.canRead()) {
            throw new IOException(file.getAbsolutePath() + " is not readable.");
        }
        int len = (int) file.length();
        final String res;
        if (len != 0) {
            res = getContent(len, new FileInputStream(file));
        } else {
            res = "";
        }
        return res;
    }

    /**
     * Gets the content of the given {@link File}.
     * 
     * @param length
     *            the {@link InputStream} size
     * @param inputStream
     *            the {@link InputStream}
     * @return a {@link String} of the content of the given {@link File}
     * @throws IOException
     *             if the {@link InputStream} can't be read
     */
    public static String getContent(int length, InputStream inputStream) throws IOException {
        final StringBuilder res = new StringBuilder(length);
        final InputStreamReader input = new InputStreamReader(new BufferedInputStream(inputStream));

        final char[] buffer = new char[length];
        int len = input.read(buffer);
        while (len != -1) {
            res.append(buffer, 0, len);
            len = input.read(buffer);
        }
        input.close();

        return res.toString();
    }
}

Related

1. fileContent(File file, Charset charset)
2. fileToString(final File f, final Charset c)
3. fileToString(final Path path, final Charset charset)
4. findPattern(File file, Charset charset, String patternString)
5. fixture(String filename, Charset charset)
6. getEOL(File file, Charset charset)
7. getFileContent(File file, String charsetName)
8. getFileContents(File file, String charset)
9. getFileEncodingCharset()