Here you can find the source of readFile(File file)
public static String readFile(File file) throws IOException
//package com.java2s; 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 { BufferedReader reader = new BufferedReader(new FileReader(file)); String line;/*from w w w .j a va2 s. com*/ StringBuffer pageBuffer = new StringBuffer(); while ((line = reader.readLine()) != null) { pageBuffer.append(line); } return pageBuffer.toString(); } }