Java文件管理器项目

/* * 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.io; import java.io.BufferedOutputStream; 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.InputStreamReader; import java.io.OutputStream; import java.io.Reader; import java.math.BigInteger; import java.net.URL; import java.net.URLConnection; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; import java.nio.charset.Charset; import java.nio.charset.StandardCharsets; import java.nio.file.Files; import java.util.ArrayList; import java.util.Collection; import java.util.Date; import java.util.Iterator; import java.util.List; import java.util.zip.CRC32; import java.util.zip.CheckedInputStream; import java.util.zip.Checksum; import org.apache.commons.io.filefilter.DirectoryFileFilter; import org.apache.commons.io.filefilter.FalseFileFilter; import org.apache.commons.io.filefilter.FileFilterUtils; import org.apache.commons.io.filefilter.IOFileFilter; import org.apache.commons.io.filefilter.SuffixFileFilter; import org.apache.commons.io.filefilter.TrueFileFilter; import org.apache.commons.io.output.NullOutputStream; /** * General file manipulation utilities. * <p> * Facilities are provided in the following areas: * <ul> * <li>writing to a file * <li>reading from a file * <li>make a directory including parent directories * <li>copying files and directories * <li>deleting files and directories * <li>converting to and from a URL * <li>listing files and directories by filter and extension * <li>comparing file content * <li>file last changed date * <li>calculating a checksum * </ul> * <p> * Note that a specific charset should be specified whenever possible. * Relying on the platform default means that the code is Locale-dependent. * Only use the default if the files are known to always use the platform default. * <p> * Origin of code: Excalibur, Alexandria, Commons-Utils * */ public class FileUtils { /** * Instances should NOT be constructed in standard programming. */ public FileUtils() { super(); } /** * The number of bytes in a kilobyte. */ public static final long ONE_KB = 1024; /** * The number of bytes in a kilobyte. * * @since 2.4 */ public static final BigInteger ONE_KB_BI = BigInteger.valueOf(ONE_KB); /** * The number of bytes in a megabyte. */ public static final long ONE_MB = ONE_KB * ONE_KB; /** * The number of bytes in a megabyte. * * @since 2.4 */ public static final BigInteger ONE_MB_BI = ONE_KB_BI.multiply(ONE_KB_BI); /** * The file copy buffer size (30 MB) */ private static final long FILE_COPY_BUFFER_SIZE = ONE_MB * 30; /** * The number of bytes in a gigabyte. */ public static final long ONE_GB = ONE_KB * ONE_MB; /** * The number of bytes in a gigabyte. * * @since 2.4 */ public static final BigInteger ONE_GB_BI = ONE_KB_BI.multiply(ONE_MB_BI); /** * The number of bytes in a terabyte. */ public static final long ONE_TB = ONE_KB * ONE_GB; /** * The number of bytes in a terabyte. * * @since 2.4 */ public static final BigInteger ONE_TB_BI = ONE_KB_BI.multiply(ONE_GB_BI); /** * The number of bytes in a petabyte. */ public static final long ONE_PB = ONE_KB * ONE_TB; /** * The number of bytes in a petabyte. * * @since 2.4 */ public static final BigInteger ONE_PB_BI = ONE_KB_BI.multiply(ONE_TB_BI); /** * The number of bytes in an exabyte. */ public static final long ONE_EB = ONE_KB * ONE_PB; /** * The number of bytes in an exabyte. * * @since 2.4 */ public static final BigInteger ONE_EB_BI = ONE_KB_BI.multiply(ONE_PB_BI); /** * The number of bytes in a zettabyte. */ public static final BigInteger ONE_ZB = BigInteger.valueOf(ONE_KB).multiply(BigInteger.valueOf(ONE_EB)); /** * The number of bytes in a yottabyte. */ public static final BigInteger ONE_YB = ONE_KB_BI.multiply(ONE_ZB); /** * An empty array of type <code>File</code>. */ public static final File[] EMPTY_FILE_ARRAY = new File[0]; //----------------------------------------------------------------------- /** * Construct a file from the set of name elements. * * @param directory the parent directory * @param names the name elements * @return the file * @since 2.1 */ public static File getFile(final File directory, final String... names) { if (directory == null) { throw new NullPointerException("directory must not be null"); } if (names == null) { throw new NullPointerException("names must not be null"); } File file = directory; for (final String name : names) { file = new File(file, name); } return file; } /** * Construct a file from the set of name elements. * * @param names the name elements * @return the file * @since 2.1 */ public static File getFile(final String... names) { if (names == null) { throw new NullPointerException("names must not be null"); } File file = null; for (final String name : names) { if (file == null) { file = new File(name); } else { file = new File(file, name); } } return file; } /** * Returns the path to the system temporary directory. * * @return the path to the system temporary directory. * * @since 2.0 */ public static String getTempDirectoryPath() { return System.getProperty("java.io.tmpdir"); } /** * Returns a {@link File} representing the system temporary directory. * * @return the system temporary directory. * * @since 2.0 */ public static File getTempDirectory() { return new File(getTempDirectoryPath()); } /** * Returns the path to the user's home directory. * * @return the path to the user's home directory. * * @since 2.0 */ public static String getUserDirectoryPath() { return System.getProperty("user.home"); } /** * Returns a {@link File} representing the user's home directory. * * @return the user's home directory. * * @since 2.0 */ public static File getUserDirectory() { return new File(getUserDirectoryPath()); } //----------------------------------------------------------------------- /** * Opens a {@link FileInputStream} for the specified file, providing better * error messages than simply calling <code>new FileInputStream(file)</code>. * <p> * At the end of the method either the stream will be successfully opened, * or an exception will have been thrown. * <p> * An exception is thrown