Java复制、移动、删除、获取大小文件

利用Apache Commons IO工具包（commons-io-1.4.jar）来实现文件（夹）的复制、移动、删除、获取大小等操作。

package com.util.file;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.StringReader;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.filefilter.AndFileFilter;
import org.apache.commons.io.filefilter.DirectoryFileFilter;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.filefilter.NotFileFilter;
import org.apache.commons.io.filefilter.SuffixFileFilter;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
* 文件工具
*/
public final class FileToolkit {
        private static final Log log = LogFactory.getLog(FileToolkit.class);

        /**
         * 复制文件或者目录到指定的文件夹,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);
                //判断是目录，还是文件
                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);
            //判断是目录，还是文件
            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 = FileToolkit.getParentPath(resFilePath) + "/" + newFileName;
                File resFile = new File(resFilePath);
                File newFile = new File(newFilePath);
                return resFile.renameTo(newFile);
        }

        /**
         * 根据文件或者目录路径，取得其父路径
         * @param filePath
         * @return String
         */
        private static String getParentPath(String filePath){
            if(filePath != null && filePath.indexOf("/")>-1){
                String parentPath = filePath.substring(0, filePath.indexOf("/"));
                System.out.println("源文件路径：" + filePath);
                System.out.println("父文件路径：" + parentPath);
                return parentPath;
            }else{
                return "";
            }
        }
       
        /**
         * 读取文件或者目录的字节大小
         *
         * @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:即不查询子目录存在的文件列表）
         *
         * @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) {
            if(suffix == null){
                return new String[]{};
            }
           
            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！)
         * 注意：会覆盖原有的文件内容
         * @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;
        }
}