Here you can find the source of copy(File inputFile, OutputStream out)
public static void copy(File inputFile, OutputStream out) throws IOException
//package com.java2s; //License from project: Open Source License import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.file.Files; import java.nio.file.StandardCopyOption; public class Main { public static final int BUFFER_SIZE = 8192; public static void copy(InputStream in, long length, OutputStream out) throws Throwable { copy(in, length, out, false);/* w ww . j a v a 2 s .c o m*/ } public static void copy(InputStream in, long length, OutputStream out, boolean closeOutput) throws Throwable { byte[] buffer = new byte[BUFFER_SIZE]; int total = 0; int len; try { while ((total < length || length < 0) && (len = in.read(buffer)) != -1) { out.write(buffer, 0, len); total += len; } } finally { Throwable t = null; if (closeOutput) { try { out.close(); } catch (Throwable ex) { t = ex; } } if (t != null) { throw t; } } } public static void copy(InputStream in, OutputStream out, boolean closeInput, boolean closeOutput) throws Throwable { byte[] buffer = new byte[BUFFER_SIZE]; int len; try { while ((len = in.read(buffer)) != -1) { out.write(buffer, 0, len); } } finally { Throwable t = null; if (closeInput) { try { in.close(); } catch (Throwable ex) { t = ex; } } if (closeOutput) { try { out.close(); } catch (Throwable ex) { t = ex; } } if (t != null) { throw t; } } } public static void copy(InputStream in, OutputStream out) throws Throwable { copy(in, out, false, false); } public static void copy(InputStream in, File outputFile, boolean closeInput) throws IOException { try { Files.copy(in, outputFile.toPath(), StandardCopyOption.REPLACE_EXISTING); } finally { if (closeInput) { in.close(); } } } public static void copy(InputStream in, File outputFile) throws IOException { copy(in, outputFile, false); } public static void copy(File inputFile, OutputStream out, boolean closeOutput) throws IOException { try { Files.copy(inputFile.toPath(), out); } finally { if (closeOutput) { out.close(); } } } public static void copy(File inputFile, OutputStream out) throws IOException { copy(inputFile, out, false); } public static void copy(File inputFile, File outputFile) throws IOException { Files.copy(inputFile.toPath(), outputFile.toPath(), StandardCopyOption.REPLACE_EXISTING); } }