Here you can find the source of copyStream(InputStream in, OutputStream out, int bufferSize)
public static void copyStream(InputStream in, OutputStream out, int bufferSize) throws IOException
//package com.java2s; /**/* w ww.j av a2 s . c om*/ * Copyright 2011 meltmedia * * Licensed 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.InputStream; import java.io.OutputStream; import java.io.IOException; import java.io.Reader; import java.io.Writer; public class Main { /** * Copies the input stream bytes into the output stream bytes, using the specified * buffer size when transfering the bytes. This method does not close the streams * when it completes. */ public static void copyStream(InputStream in, OutputStream out, int bufferSize) throws IOException { byte[] buffer = new byte[bufferSize]; int read = 0; while ((read = in.read(buffer)) >= 0) { out.write(buffer, 0, read); } } /** * Copies the content of a reader into a writer, using the specified buffer size while * transfering the characters. */ public static void copyStream(Reader reader, Writer writer, int buffer_length) throws IOException { char[] buffer = new char[buffer_length]; for (int read = reader.read(buffer); read > -1; read = reader.read(buffer)) writer.write(buffer, 0, read); } }