Here you can find the source of copyLarge(Reader input, Writer output)
Reader to a Writer.
public static long copyLarge(Reader input, Writer output) throws IOException
//package com.java2s; /*//from w ww . jav a 2 s . com * Sonar, open source software quality management tool. * Copyright (C) 2008-2011 SonarSource * mailto:contact AT sonarsource DOT com * * Sonar is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 3 of the License, or (at your option) any later version. * * Sonar is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Sonar; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02 */ import java.io.*; public class Main { /** * The default buffer size to use. */ private static final int DEFAULT_BUFFER_SIZE = 1024 * 4; /** * Copy bytes from an <code>InputStream</code> to an <code>OutputStream</code>. */ public static long copyLarge(InputStream input, OutputStream output) throws IOException { byte[] buffer = new byte[DEFAULT_BUFFER_SIZE]; long count = 0; int n = 0; while (-1 != (n = input.read(buffer))) { output.write(buffer, 0, n); count += n; } return count; } /** * Copy chars from a <code>Reader</code> to a <code>Writer</code>. */ public static long copyLarge(Reader input, Writer output) throws IOException { char[] buffer = new char[DEFAULT_BUFFER_SIZE]; long count = 0; int n = 0; while (-1 != (n = input.read(buffer))) { output.write(buffer, 0, n); count += n; } return count; } }