将整个目录复制到保留文件日期的新位置。
/** 来 自 N o w J a v a . c o m**/ /* * 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. */ import java.io.Closeable; import java.io.File; import java.io.FileFilter; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.channels.FileChannel; import java.util.ArrayList; import java.util.List; public class Main{/** nowjava - 时 代 Java 提 供 **/ public static void main(String[] argv) throws Exception{ File srcDir = new File("Main.java"); File destDir = new File("Main.java"); copyDirectory(srcDir,destDir); } /** * The file copy buffer size (30 MB) */ private static final long FILE_COPY_BUFFER_SIZE = ONE_MB * 30; /** * Copies a whole directory to a new location preserving the file dates. * <p> * This method copies the specified directory and all its child * directories and files to the specified destination. * The destination is the new location and name of the directory. * <p> * The destination directory is created if it does not exist. * If the destination directory did exist, then this method merges * the source with the destination, with the source taking precedence. * <p> * <strong>Note:</strong> This method tries to preserve the files' last * modified date/times using {@link File#setLastModified(long)}, however * it is not guaranteed that those operations will succeed. * If the modification operation fails, no indication is provided. * * @param srcDir an existing directory to copy, must not be <code>null</code> * @param destDir the new directory, must not be <code>null</code> * * @throws NullPointerException if source or destination is <code>null</code> * @throws IOException if source or destination is invalid * @throws IOException if an IO error occurs during copying * @since Commons IO 1.1 */ public static void copyDirectory(File srcDir, File destDir) throws IOException { copyDirectory(srcDir, destDir, true); } /** * Copies a whole directory to a new location. * <p> * This method copies the contents of the specified source directory * to within the specified destination directory. * <p> * The destination directory is created if it does not exist. * If the destination directory did exist, then this method merges * the source with the destination, with the source taking precedence. * <p> * <strong>Note:</strong> Setting <code>preserveFileDate</code> to * <code>true</code> tries to preserve the files' last modified * date/times using {@link File#setLastModified(long)}, however it is * not guaranteed that those operations will succeed. * If the modification operation fails, no indication is provided. * * @param srcDir an existing directory to copy, must not be <code>null</code> * @param destDir the new directory, must not be <code>null</code> * @param preserveFileDate true if the file date of the copy * should be the same as the original * * @throws NullPointerException if source or destination is <code>null</code> * @throws IOException if source or destination is invalid * @throws IOException if an IO error occurs during copying * @since Commons IO 1.1 */ private static void copyDirectory(File srcDir, File destDir, boolean preserveFileDate) throws IOException { copyDirectory(srcDir, destDir, null, preserveFileDate); } /** * Copies a filtered directory to a new location. * <p> * This method copies the contents of the specified source directory * to within the specified destination directory. * <p> * The destination directory is created if it does not exist. * If the destination directory did exist, then this method merges * the source with the destination, with the source taking precedence. * <p> * <strong>Note:</strong> Setting <code>preserveFileDate</code> to * <code>true</code> tries to preserve the files' last modified * date/times using {@link File#setLastModified(long)}, however it is * not guaranteed that those operations will succeed. * If the modification operation fails, no indication is provided. * * <h4>Example: Copy directories only</h4> * <pre> * // only copy the directory structure * FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY, false); * </pre> * * <h4>Example: Copy directories and txt files</h4> * <pre> * // Create a filter for ".txt" files * IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt"); * IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter); * * // Create a filter for either directories or ".txt" files * FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles); * * // Copy using the filter * FileUtils.copyDirectory(srcDir, destDir, filter, false); * </pre> * * @param srcDir an existing directory to copy, must not be <code>null</code> * @param destDir the new directory, must not be <code>null</code> * @param filter the filter to apply, null means copy all directories and files * @param preserveFileDate true if the file date of the copy * should be the same as the original * * @throws NullPointerException if source or destination is <code>null</code> * @throws IOException if source or destination is invalid * @throws IOException if an IO error occurs during copying * @since Commons IO 1.4 */ private static void copyDirectory(File srcDir, File destDir, FileFilter filter, boolean preserveFileDate) throws IOException { if (srcDir == null) { throw new NullPointerException("Source must not be null"); } if (destDir == null) { throw new NullPointerException("Destination must not be null"); } if (srcDir.exists() == false) { throw new FileNotFoundException("Source '" + srcDir + "' does not exist"); } if (srcDir.isDirectory() == false) { throw new IOException("Source '" + srcDir + "' exists but is not a directory"); } if (srcDir.getCanonicalPath().equals(destDir.getCanonicalPath())) { throw new IOException("Source '" + srcDir + "' and destination '" + destDir + "' are the same"); } // Cater for destination being directory within the source directory (see IO-141) List<String> exclusionList = null; if (destDir.getCanonicalPath() .startsWith(srcDir.getCanonicalPath())) { File[] srcFiles = filter == null ? srcDir.listFiles() : srcDir .listFiles(filter); if (srcFiles != null && srcFiles.length > 0) { exclusionList = new ArrayList<String>(srcFiles.length); for (File srcFile : srcFiles) { File copiedFile = new File(destDir, srcFile.getName()); exclusionList.add(copiedFile.getCanonicalPath()); } } } doCopyDirectory(srcDir, destDir, filter, preserveFileDate, exclusionList); } /** * Internal copy directory method. * * @param srcDir the validated source directory, must not be <code>null</code> * @param destDir the validated destination directory, must not be <code>null</code> * @param filter the filter to apply, null means copy all directories and files * @param preserveFileDate whether to preserve the file date * @param exclusionList List of files and directories to exclude from the copy, may be null * @throws IOException if an error occurs * @since Commons IO 1.1 */ private static void doCopyDirectory(File srcDir, File destDir, FileFilter filter, boolean preserveFileDate, List<String> exclusionList) throws IOException { // recurse File[] srcFiles = filter == null ? srcDir.listFiles() : srcDir .listFiles(filter); if (srcFiles == null) { // null if abstract pathname does not denote a directory, or if an I/O error occurs throw new IOException("Failed to list contents of " + srcDir); } if (destDir.exists()) { if (destDir.isDirectory() == false) { throw new IOException("Destination '" + destDir + "' exists but is not a directory"); } } else { if (!destDir.mkdirs() && !destDir.isDirectory()) { throw new IOException("Destination '" + destDir + "' directory cannot be created"); } } if (destDir.canWrite() == false) { throw new IOException("Destination '" + destDir + "' cannot be written to"); } for (File srcFile : srcFiles) { File dstFile = new File(destDir, srcFile.getName()); if (exclusionList == null || !exclusionList.contains(srcFile.getCanonicalPath())) { if (srcFile.isDirectory()) { doCopyDirectory(srcFile, dstFile, filter, preserveFileDate, exclusionList); } else { doCopyFile(srcFile, dstFile, preserveFileDate); } } } // Do this last, as the above has probably affected directory metadata if (preserveFileDate) { destDir.setLastModified(srcDir.lastModified()); } } /** * Internal copy file method. * * @param srcFile the validated source file, must not be <code>null</code> * @param destFile the validated destination file, must not be <code>null</code> * @param preserveFileDate whether to preserve the file date * @throws IOException if an error occurs */ private static void doCopyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException { if (destFile.exists() && destFile.isDirectory()) { throw new IOException("Destination '" + destFile + "' exists but is a directory"); } FileInputStream fis = null; FileOutputStream fos = null; FileChannel input = null; FileChannel output = null; try { fis = new FileInputStream(srcFile); fos = new FileOutputStream(destFile); input = fis.getChannel(); output = fos.getChannel(); long size = input.size(); long pos = 0; long count = 0; while (pos < size) { count = (size - pos) > FILE_COPY_BUFFER_SIZE ? FILE_COPY_BUFFER_SIZE : (size - pos); pos += output.transferFrom(input, pos, count); } } finally { closeQuietly(output); closeQuietly(fos); closeQuietly(input); closeQuietly(fis); } if (srcFile.length() != destFile.length()) { throw new IOException("Failed to copy full contents from '" + srcFile + "' to '" + destFile + "'"); } if (preserveFileDate) { destFile.setLastModified(srcFile.lastModified()); } }