Here you can find the source of readFile(String fileName)
fileNameas a string buffer.
public static StringBuffer readFile(String fileName) throws IOException
//package com.java2s; /*/* ww w . j a v a 2 s . c o m*/ * Copyright (C) 1990-2001 DMS Decision Management Systems Ges.m.b.H. * * This library 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 2 of the License, or (at your option) any later version. * * This library 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 library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * $Id: Utils.java,v 1.56 2008-11-02 02:01:43 mgordon Exp $ */ import java.io.*; public class Main { /** * Returns the contents of <pre>fileName</pre> as a string buffer. */ public static StringBuffer readFile(String fileName) throws IOException { StringBuffer result = new StringBuffer(); BufferedReader in = new BufferedReader(new FileReader(fileName)); while (true) { String line = in.readLine(); if (line == null) { break; } else { result.append(line + "\n"); } } in.close(); return result; } }