Java 文件操作工具类
文件及其文件夹的复制，删除，拷贝等操作类
package util; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.FilenameFilter; public class FileUtil { private final static String FILE_SUFFIX = ".java.drl"; private final static String FILE_TEMP = "C:/temp/"; /** * 将已存在的drl文件删除 * * @param ObjectPath */ public static void deleteExistedDRLFile(String ObjectPath) { File filePath = new File(ObjectPath); if (!filePath.exists()) { System.out.println("目录不存在!"); } else { if (filePath.isDirectory()) { File[] list = filePath.listFiles(new FilenameFilter() { public boolean accept(File dir, String name) { return name.endsWith(FILE_SUFFIX); } }); for (int i = 0; i < list.length; i++) { list[i].delete(); } } } } /** * 创建文件夹,如果有则不创建 * * @param ObjectPath */ public static boolean creareDirectory(String ObjectPath) { boolean flag = true; File filePath = new File(ObjectPath); if (!filePath.exists()) { filePath.mkdir(); flag = false; } return flag; } /** * 查看某文件夹下面是否有文件,有文件则创建一个temp文件夹,将文件拷贝到temp目录下(备份文件) 没有文件怎什么都不做 * 备份后，把原文件夹里文件删除 * * @param ObjectPath */ public static void backupFile(String ObjectPath, String dirName) { String backupPath; if (!FILE_TEMP.endsWith(File.separator)) { backupPath = FILE_TEMP + File.separator + dirName; } else { backupPath = FILE_TEMP + dirName; } File backupFilePath = new File(backupPath); if (!backupFilePath.exists()) { backupFilePath.mkdirs(); } File filePath = new File(ObjectPath); if (!filePath.exists()) { System.out.println("目录不存在!"); } else { if (filePath.isDirectory()) { File[] list = filePath.listFiles(); if (list != null && list.length != 0) { copyFolder(ObjectPath, backupPath);// 文件备份 for (int i = 0; i < list.length; i++) { list[i].delete(); } } } } } /** * 复原文件，把文件从备份文件夹拷贝到原来文件夹 * * @param ObjectPath * @param dirName */ public static void recoverFile(String ObjectPath, String dirName) { String backupPath; if (ObjectPath.endsWith(File.separator)) { ObjectPath = new StringBuffer(ObjectPath).append(dirName) .toString(); } else { ObjectPath = new StringBuffer(ObjectPath) .append(File.separatorChar).append(dirName).toString(); } if (!FILE_TEMP.endsWith(File.separator)) { backupPath = FILE_TEMP + File.separator + dirName; } else { backupPath = FILE_TEMP + dirName; } File backupFilePath = new File(backupPath); if (!backupFilePath.exists()) { backupFilePath.mkdirs(); } File filePath = new File(ObjectPath); if (!filePath.exists()) { System.out.println("目录不存在!"); } else { if (filePath.isDirectory()) { File[] list = filePath.listFiles(); if (list != null && list.length != 0) { copyFolder(backupPath, ObjectPath);// 文件复原 } } } } /** * 复制整个文件夹内容 * * @param oldPath * String 原文件路径 如：c:/fqf * @param newPath * String 复制后路径 如：f:/fqf/ff * @return boolean */ public static void copyFolder(String oldPath, String newPath) { try { (new File(newPath)).mkdir(); // 如果文件夹不存在 则建立新文件夹 File a = new File(oldPath); String[] file = a.list(); File temp = null; for (int i = 0; i < file.length; i++) { if (oldPath.endsWith(File.separator)) { temp = new File(oldPath + file[i]); } else { temp = new File(oldPath + File.separator + file[i]); } if (temp.isFile()) { FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream(newPath + "/" + (temp.getName()).toString()); byte[] b = new byte[1024 * 5]; int len; while ((len = input.read(b)) != -1) { output.write(b, 0, len); } output.flush(); output.close(); input.close(); } if (temp.isDirectory()) {// 如果是子文件夹 copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]); } } } catch (Exception e) { System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } } /** * 删除备份文件和存放备份文件的文件夹 * * @param ObjectPath */ public static void deleteFileAndDirectory(String dirName) { String ObjectPath; if (!FILE_TEMP.endsWith(File.separator)) { ObjectPath = FILE_TEMP + File.separator + dirName; } else { ObjectPath = FILE_TEMP + dirName; } File filePath = new File(ObjectPath); if (!filePath.exists()) { filePath.mkdirs(); System.out.println("目录不存在!"); } else { if (filePath.isDirectory()) { File[] list = filePath.listFiles(); for (int i = 0; i < list.length; i++) { list[i].delete(); } } filePath.delete(); } } /** * 判断某文件夹下是否存在文件，存在返回true * * @param ObjectPath * @return */ public static boolean existFileInDirectory(String ObjectPath) { boolean flag = false; File filePath = new File(ObjectPath); if (filePath.exists()) { if (filePath.isDirectory()) { File[] list = filePath.listFiles(); if (list != null && list.length != 0) { flag = true; } } } return flag; } /** * 删除某个文件夹 * @param ObjectPath */ public static void deleteDirectory(String ObjectPath) { File filePath = new File(ObjectPath); if (filePath.exists()) { filePath.delete(); } } /** * 将已存在的文件删除 * * @param ObjectPath */ public static boolean deleteExistedFile(String ObjectPath,final String fileName) { boolean flag =false; File filePath = new File(ObjectPath); if (filePath.exists()) { if (filePath.isDirectory()) { File[] list = filePath.listFiles(new FilenameFilter() { public boolean accept(File dir, String name) { return name.equals(fileName); } }); for (int i = 0; i < list.length; i++) { list[i].delete(); } flag=true; } } return flag; } }