Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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. */ package org.apache.commons.vfs; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; /** * Utility methods for dealng with FileObjects. * * @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a> * @version $Revision$ $Date$ */ public class FileUtil { private FileUtil() { } /** * Returns the content of a file, as a byte array. * * @param file The file to get the content of. */ public static byte[] getContent(final FileObject file) throws IOException { final FileContent content = file.getContent(); final int size = (int) content.getSize(); final byte[] buf = new byte[size]; final InputStream in = content.getInputStream(); try { int read = 0; for (int pos = 0; pos < size && read >= 0; pos += read) { read = in.read(buf, pos, size - pos); } } finally { in.close(); } return buf; } /** * Writes the content of a file to an OutputStream. */ public static void writeContent(final FileObject file, final OutputStream outstr) throws IOException { final InputStream instr = file.getContent().getInputStream(); try { final byte[] buffer = new byte[1024]; while (true) { final int nread = instr.read(buffer); if (nread < 0) { break; } outstr.write(buffer, 0, nread); } } finally { instr.close(); } } /** * Copies the content from a source file to a destination file. */ public static void copyContent(final FileObject srcFile, final FileObject destFile) throws IOException { // Create the output stream via getContent(), to pick up the // validation it does final OutputStream outstr = destFile.getContent().getOutputStream(); try { writeContent(srcFile, outstr); } finally { outstr.close(); } } }