Here you can find the source of loadString(File f, Charset charset)
public static String loadString(File f, Charset charset) throws IOException
//package com.java2s; /*//from ww w . j av a2s. c o m * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.nio.charset.Charset; public class Main { private static final int READ_BUFFER_SIZE = 4096; public static String loadString(File f, Charset charset) throws IOException { FileInputStream in = new FileInputStream(f); try { return loadString(in, charset); } finally { in.close(); } } public static String loadString(InputStream in, Charset charset) throws IOException { Reader r = new InputStreamReader(in, charset); StringBuilder sb = new StringBuilder(256); try { char[] buf = new char[READ_BUFFER_SIZE]; int ln; while ((ln = r.read(buf)) != -1) { sb.append(buf, 0, ln); } } finally { r.close(); } return sb.toString(); } }