Java创造、重命名、删除文件和文件夹

Java的文件操作太基础，缺乏很多实用工具，比如对目录的操作，支持就非常的差了。如果你经常用Java操作文件或文件夹，你会觉得反复编写这些代码是令人沮丧的问题，而且要大量用到递归。

??? 下面是的一个解决方案，借助Apache Commons IO工具包（commons-io-1.1.jar）来简单实现文件（夹）的复制、移动、删除、获取大小等操作。

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.filefilter.*;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.*;

/**
* 文件工具箱
*
* @author leizhimin 2008-12-15 13:59:16
*/
public final class FileToolkit {
??????? private static final Log log = LogFactory.getLog(FileToolkit.class);

??????? /**
???????? * 复制文件或者目录,复制前后文件完全一样。
???????? *
???????? * @param resFilePath 源文件路径
???????? * @param distFolder??? 目标文件夹
???????? * @IOException 当操作发生异常时抛出
???????? */
??????? public static void copyFile(String resFilePath, String distFolder) throws IOException {
??????????????? File resFile = new File(resFilePath);
??????????????? File distFile = new File(distFolder);
??????????????? if (resFile.isDirectory()) {
??????????????????????? FileUtils.copyDirectoryToDirectory(resFile, distFile);
??????????????? } else if (resFile.isFile()) {
??????????????????????? FileUtils.copyFileToDirectory(resFile, distFile, true);
??????????????? }
??????? }

??????? /**
???????? * 删除一个文件或者目录
???????? *
???????? * @param targetPath 文件或者目录路径
???????? * @IOException 当操作发生异常时抛出
???????? */
??????? public static void deleteFile(String targetPath) throws IOException {
??????????????? File targetFile = new File(targetPath);
??????????????? if (targetFile.isDirectory()) {
??????????????????????? FileUtils.deleteDirectory(targetFile);
??????????????? } else if (targetFile.isFile()) {
??????????????????????? targetFile.delete();
??????????????? }
??????? }

??????? /**
???????? * 移动文件或者目录,移动前后文件完全一样,如果目标文件夹不存在则创建。
???????? *
???????? * @param resFilePath 源文件路径
???????? * @param distFolder??? 目标文件夹
???????? * @IOException 当操作发生异常时抛出
???????? */
??????? public static void moveFile(String resFilePath, String distFolder) throws IOException {
??????????????? File resFile = new File(resFilePath);
??????????????? File distFile = new File(distFolder);
??????????????? if (resFile.isDirectory()) {
??????????????????????? FileUtils.moveDirectoryToDirectory(resFile, distFile, true);
??????????????? } else if (resFile.isFile()) {
??????????????????????? FileUtils.moveFileToDirectory(resFile, distFile, true);
??????????????? }
??????? }

??????? /**
???????? * 重命名文件或文件夹
???????? *
???????? * @param resFilePath 源文件路径
???????? * @param newFileName 重命名
???????? * @return 操作成功标识
???????? */
??????? public static boolean renameFile(String resFilePath, String newFileName) {
??????????????? String newFilePath = StringToolkit.formatPath(StringToolkit.getParentPath(resFilePath) + "/" + newFileName);
??????????????? File resFile = new File(resFilePath);
??????????????? File newFile = new File(newFilePath);
??????????????? return resFile.renameTo(newFile);
??????? }

??????? /**
???????? * 读取文件或者目录的大小
???????? *
???????? * @param distFilePath 目标文件或者文件夹
???????? * @return 文件或者目录的大小，如果获取失败，则返回-1
???????? */
??????? public static long genFileSize(String distFilePath) {
??????????????? File distFile = new File(distFilePath);
??????????????? if (distFile.isFile()) {
??????????????????????? return distFile.length();
??????????????? } else if (distFile.isDirectory()) {
??????????????????????? return FileUtils.sizeOfDirectory(distFile);
??????????????? }
??????????????? return -1L;
??????? }

??????? /**
???????? * 判断一个文件是否存在
???????? *
???????? * @param filePath 文件路径
???????? * @return 存在返回true，否则返回false
???????? */
??????? public static boolean isExist(String filePath) {
??????????????? return new File(filePath).exists();
??????? }

??????? /**
???????? * 本地某个目录下的文件列表（不递归）
???????? *
???????? * @param folder ftp上的某个目录
???????? * @param suffix 文件的后缀名（比如.mov.xml)
???????? * @return 文件名称列表
???????? */
??????? public static String[] listFilebySuffix(String folder, String suffix) {
??????????????? IOFileFilter fileFilter1 = new SuffixFileFilter(suffix);
??????????????? IOFileFilter fileFilter2 = new NotFileFilter(DirectoryFileFilter.INSTANCE);
??????????????? FilenameFilter filenameFilter = new AndFileFilter(fileFilter1, fileFilter2);
??????????????? return new File(folder).list(filenameFilter);
??????? }

??????? /**
???????? * 将字符串写入指定文件(当指定的父路径中文件夹不存在时，会最大限度去创建，以保证保存成功！)
???????? *
???????? * @param res??????????? 原字符串
???????? * @param filePath 文件路径
???????? * @return 成功标记
???????? */
??????? public static boolean string2File(String res, String filePath) {
??????????????? boolean flag = true;
??????????????? BufferedReader bufferedReader = null;
??????????????? BufferedWriter bufferedWriter = null;
??????????????? try {
??????????????????????? File distFile = new File(filePath);
??????????????????????? if (!distFile.getParentFile().exists()) distFile.getParentFile().mkdirs();
??????????????????????? bufferedReader = new BufferedReader(new StringReader(res));
??????????????????????? bufferedWriter = new BufferedWriter(new FileWriter(distFile));
??????????????????????? char buf[] = new char[1024];???????? //字符缓冲区
??????????????????????? int len;
??????????????????????? while ((len = bufferedReader.read(buf)) != -1) {
??????????????????????????????? bufferedWriter.write(buf, 0, len);
??????????????????????? }
??????????????????????? bufferedWriter.flush();
??????????????????????? bufferedReader.close();
??????????????????????? bufferedWriter.close();
??????????????? } catch (IOException e) {
??????????????????????? flag = false;
??????????????????????? e.printStackTrace();
??????????????? }
??????????????? return flag;
??????? }
}