Here you can find the source of readFile(File file)
public static String readFile(File file) throws IOException
//package com.java2s; /*/*from w w w . j a v a2 s . c o m*/ * Copyright (C) 2011 Chair of Artificial Intelligence and Applied Informatics * Computer Science VI, University of Wuerzburg * * This is free software; you can redistribute it and/or modify it under the * terms of the GNU Lesser General Public License as published by the Free * Software Foundation; either version 3 of the License, or (at your option) any * later version. * * This software 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 Lesser General Public License for more * details. * * You should have received a copy of the GNU Lesser General Public License * along with this software; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA, or see the FSF * site: http://www.fsf.org. */ import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; public class Main { public static String readFile(File file) throws IOException { StringBuilder buffy = new StringBuilder(); BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(file), "UTF8")); String str; while ((str = in.readLine()) != null) { buffy.append(str).append("\n"); } in.close(); return buffy.toString(); } }