Here you can find the source of copyStream(InputStream input, OutputStream output)
public static void copyStream(InputStream input, OutputStream output) throws IOException
//package com.java2s; /******************************************************************************* * Copyright 2011 See AUTHORS file./* w w w . j ava 2s . c om*/ * * 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.*; public class Main { public static final int DEFAULT_BUFFER_SIZE = 4096; /** Allocates a {@value #DEFAULT_BUFFER_SIZE} byte[] for use as a temporary buffer and calls * {@link #copyStream(InputStream, OutputStream, byte[])}. */ public static void copyStream(InputStream input, OutputStream output) throws IOException { copyStream(input, output, new byte[DEFAULT_BUFFER_SIZE]); } /** Allocates a byte[] of the specified size for use as a temporary buffer and calls * {@link #copyStream(InputStream, OutputStream, byte[])}. */ public static void copyStream(InputStream input, OutputStream output, int bufferSize) throws IOException { copyStream(input, output, new byte[bufferSize]); } /** Copy the data from an {@link InputStream} to an {@link OutputStream}, using the specified byte[] as a temporary buffer. The * stream is not closed. */ public static void copyStream(InputStream input, OutputStream output, byte[] buffer) throws IOException { int bytesRead; while ((bytesRead = input.read(buffer)) != -1) { output.write(buffer, 0, bytesRead); } } }