Java FileReader Read readFile(File iFile)

Description

read File

License

MIT License

Declaration

static public String readFile(File iFile) throws IOException 

Method Source Code

//package com.java2s;
/*// w w w.ja  va 2s.c o  m
 * Copyright (c) 2010 Patrick Mueller
 * Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
 */

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;

import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;

public class Main {
    static private final int DEFAULT_BUFFER_SIZE = 256 * 256 - 400;

    /**
     * 
     */
    static public String readFile(String iFileName) throws IOException {
        return readFile(new File(iFileName));
    }

    /**
     * 
     */
    static public String readFile(File iFile) throws IOException {
        if (!iFile.exists())
            throw new FileNotFoundException("file not found: " + iFile.getAbsolutePath());

        long iFileLength = iFile.length();

        if (0 == iFileLength)
            return "";
        int bufferSize = (int) Math.min(iFileLength, (long) DEFAULT_BUFFER_SIZE);

        FileReader fr = new FileReader(iFile);
        String result = readStream(fr, bufferSize);
        fr.close();

        return result;
    }

    /**
     * 
     */
    static public String readStream(Reader rStream, int bufferSize) throws IOException {
        if (bufferSize <= 0)
            bufferSize = DEFAULT_BUFFER_SIZE;
        bufferSize = Math.min(bufferSize, DEFAULT_BUFFER_SIZE);

        char[] buffer = new char[bufferSize];
        StringWriter sr = new StringWriter(bufferSize);

        int read;
        while ((read = rStream.read(buffer)) > 0) {
            sr.write(buffer, 0, read);
        }

        return sr.toString();
    }
}

Related

1. readFile(File file)
2. readFile(File file)
3. readFile(File file)
4. readFile(File file)
5. readFile(File file)
6. readFile(final String fileName)
7. readFile(Reader reader)
8. readFile(String file)
9. readFile(String file)