Here you can find the source of copyStream(Reader in, Writer out)
public static void copyStream(Reader in, Writer out) throws IOException
//package com.java2s; /*/*from w ww. j ava 2s. c o m*/ * The MIT License (MIT) * * Copyright (c) 2015 Ziver Koc * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ import java.io.*; public class Main { /** * Copies all data from one InputStream to another OutputStream. * The streams will not be closed after method has returned. */ public static void copyStream(InputStream in, OutputStream out) throws IOException { byte[] buff = new byte[8192]; // This is the default BufferedInputStream buffer size int len; while ((len = in.read(buff)) > 0) { out.write(buff, 0, len); } } /** * Copies all data from one Reader to another Writer. * The streams will not be closed after method has returned. */ public static void copyStream(Reader in, Writer out) throws IOException { char[] buff = new char[8192]; // This is the default BufferedReader buffer size int len; while ((len = in.read(buff)) > 0) { out.write(buff, 0, len); } } }