Here you can find the source of readFile(File f)
public static String readFile(File f) throws java.io.IOException
//package com.java2s; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; public class Main { public static String readFile(File f) throws java.io.IOException { StringBuffer fileData = new StringBuffer(1000); BufferedReader reader = new BufferedReader(new FileReader(f)); char[] buf = new char[1024]; int numRead = 0; while ((numRead = reader.read(buf)) != -1) { String readData = String.valueOf(buf, 0, numRead); fileData.append(readData);// w w w . j a v a2 s . co m buf = new char[1024]; } reader.close(); return fileData.toString(); } }