文件操作工具

public class FileUtil{/** * 私有构造什么也不做仅仅是为了不让别人直接创建一个FileUtil实例 */private FileUtil(){}/** * 查询某个目录下指定扩展名的文件 *  */public static String[] findByExt(String Dir, String extNameReg){File f = new File(Dir);FilenameFilter ff = new MyFileFilter(extNameReg);return f.list(ff);}/** * 显示文件的内容 *  */public static void showFile(String fileName){StringBuffer sb = new StringBuffer(0);BufferedReader br = null;try{File f = new File(fileName);if (f.isFile()){sb.append(fileName).append("\r\n");FileReader fr = new FileReader(f);br = new BufferedReader(fr);String str = br.readLine();while (str != null){sb.append(str).append("\r\n");str = br.readLine();}System.out.println(sb);}}catch (Exception e){e.printStackTrace();}finally{if (null != br){try{br.close();}catch (IOException e){e.printStackTrace();}}}}/** * 复制文件 *  */public static void copyFile(String srcPath, String desPath){try{File srcf = new File(srcPath);if (srcf.exists()){FileInputStream inStream = new FileInputStream(srcPath);FileOutputStream outStream = new FileOutputStream(desPath);byte[] buffer = new byte[1024];// 返回实际读取到文件内容的长度int length = inStream.read(buffer);while (length != -1){// 如果不指定写入的文件长度,文件大小会超出复制的文件outStream.write(buffer, 0, length);length = inStream.read(buffer);}inStream.close();outStream.close();}else{System.out.println("源文件" + srcPath + "不存在!");}}catch (IOException e){e.printStackTrace();}}/** * 移动文件 *  */public static void moveFile(String srcPath, String desPath){try{copyFile(srcPath, desPath);File f = new File(srcPath);if (f.exists()){f.delete();}}catch (Exception e){e.printStackTrace();}}/** * 删除文件 *  */public static void delFile(String filePath){try{File f = new File(filePath);if (f.exists()){f.delete();}}catch (Exception e){e.printStackTrace();}}}class MyFileFilter implements FilenameFilter{private Pattern pattern;MyFileFilter(String regex){pattern = Pattern.compile(regex);}public boolean accept(File dir, String name){String nameString = new File(name).getName();String extName = nameString.substring(nameString.lastIndexOf(".") + 1);return pattern.matcher(extName).matches();}}

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