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Apache Commons VFS is a Virtual File System library.
There is a newer version: 2.9.0
/*
 * 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.vfs2;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * Utility methods for dealing with FileObjects.
 */
public final class FileUtil {

    private FileUtil() {
    }

    /**
     * Returns the content of a file, as a byte array.
     *
     * @param file The file to get the content of.
     * @return The content as a byte array.
     * @throws IOException if the file content cannot be accessed.
     */
    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.
     *
     * @param file The FileObject to write.
     * @param output The OutputStream to write to.
     * @throws IOException if an error occurs writing the file.
     * @see FileContent#write(OutputStream)
     */
    public static void writeContent(final FileObject file, final OutputStream output) throws IOException {
        file.getContent().write(output);
    }

    /**
     * Copies the content from a source file to a destination file.
     *
     * @param srcFile The source FileObject.
     * @param destFile The target FileObject
     * @throws IOException If an error occurs copying the file.
     * @see FileContent#write(FileContent)
     * @see FileContent#write(FileObject)
     */
    public static void copyContent(final FileObject srcFile, final FileObject destFile) throws IOException {
        srcFile.getContent().write(destFile);
    }

}