Here you can find the source of readFile(File file)
public static String readFile(File file) throws IOException
//package com.java2s; //License from project: GNU General Public License 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 { BufferedReader reader = new BufferedReader(new InputStreamReader( new FileInputStream(file))); try {/*from w ww .jav a 2s .c o m*/ StringBuilder ret = new StringBuilder(); String line; while ((line = reader.readLine()) != null) { ret.append(line); ret.append("\n"); } return ret.toString(); } finally { reader.close(); } } }