Here you can find the source of readFile(File file)
public static String readFile(File file) throws IOException
//package com.java2s; /**/*w ww .ja v a 2s. c om*/ * Copyright (C) 2010-14 diirt developers. See COPYRIGHT.TXT * All rights reserved. Use is subject to license terms. See LICENSE.TXT */ import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; public class Main { public static String readFile(File file) throws IOException { StringBuilder out = new StringBuilder(); BufferedReader br = new BufferedReader(new FileReader(file)); for (String line = br.readLine(); line != null; line = br.readLine()) out.append(line + "\n"); br.close(); return out.toString(); } }