Here you can find the source of readFile(File file)
static public StringBuffer readFile(File file) throws IOException
//package com.java2s; //License from project: Open Source License import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; public class Main { static public StringBuffer readFile(File file) throws IOException { StringBuffer result = new StringBuffer(); BufferedReader in = new BufferedReader(new FileReader(file)); char[] buf = new char[1024]; int len = 0; while ((len = in.read(buf)) != -1) { result.append(buf, 0, len);/* w ww.j a va 2 s . c o m*/ } in.close(); return result; } }