整理的一些用到过的工具类，本文为文件操作相关。不是很全......

public class FileUtils {/*** 删除指定的目录或文件** @param path 要删除的目录或文件* @return 删除成功返回 true，否则返回 false。*/public static boolean deleteFolder(String path) {boolean flag = false;File file = new File(path);// 判断目录或文件是否存在if (file.exists()) {// 判断是否为文件if (file.isFile()) { // 为文件时调用删除文件方法return deleteFile(path);} else { // 为目录时调用删除目录方法return deleteDirectory(path);}} else {return flag;}}/*** 删除单个文件** @param path 要删除文件的文件名* @return 单个文件删除成功返回true，否则返回false*/public static boolean deleteFile(String path) {boolean flag = false;File file = new File(path);// 路径为文件且不为空则进行删除if (file.isFile() && file.exists()) {file.delete();flag = true;}return flag;}/*** 删除目录以及目录下的文件** @param path 要删除目录的文件路径** @return 目录删除成功返回true，否则返回false*/public static boolean deleteDirectory(String path) {// 如果path不以文件分隔符结尾，自动添加文件分隔符if (!path.endsWith(File.separator)) {path = path + File.separator;}File dirFile = new File(path);// 如果dir对应的文件不存在，或者不是一个目录，则退出if (!dirFile.exists() || !dirFile.isDirectory()) {return false;}boolean flag = true;File[] files = dirFile.listFiles();// 删除文件夹下的所有文件(包括子目录)for (int i = 0; i < files.length; i++) {// 删除子文件if (files[i].isFile()) {flag = deleteFile(files[i].getAbsolutePath());if (!flag)break;} else {// 删除子目录的递归调用，循环删除flag = deleteDirectory(files[i].getAbsolutePath());if (!flag)break;}}if (!flag)return false;// 删除当前目录if (dirFile.delete()) {return true;} else {return false;}}/*** 复制目录** @param oldPath*            需要复制的目录* @param newPath*            目标目录*/public static boolean copyDirectory(String oldPath, String newPath) {BufferedReader br = null;BufferedWriter bw = null;try {(new File(newPath)).mkdirs(); // 如果目录不存在 则建立新目录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()) {br = new BufferedReader(new InputStreamReader(new FileInputStream(temp)));bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(newPath + File.separator+ (temp.getName()).toString())));String data;while ((data = br.readLine()) != null) {bw.write(data, 0, data.length());}bw.flush();}if (temp.isDirectory()) {// 如果是子文件夹copyDirectory(oldPath + File.separator + file[i], newPath+ File.separator + file[i]);}}return true;} catch (Exception e1) {System.out.println("复制整个文件夹内容操作出错");e1.printStackTrace();return false;} finally {try {if (br != null) {br.close();}if (bw != null) {bw.close();}} catch (Exception e2) {}}}/**** 测试方法**/public static void main(String[] args) {FileUtils.deleteFolder("E:/testFolder");}
}