Java tutorial
/** * Copyright (c) 2012-2014 http://www.eryansky.com * * Licensed under the Apache License, Version 2.0 (the "License"); */ package com.eryansky.common.utils.io; import com.eryansky.common.exception.ServiceException; import org.apache.commons.codec.binary.Base64; import java.io.*; import java.net.URLEncoder; import java.util.UUID; /** * . * @author : &Eryan eryanwcp@gmail.com * @date : 2013-1-19 ?4:41:56 */ public class FileUtil { /** * ???? ??,UUID??,?????? * * @param fileName * ??+? * @return */ public static String generateUUIDFileName(String fileName) { UUID uuid = UUID.randomUUID(); String str = fileName; System.out.println(str); str = uuid.toString() + "." + str.substring(str.lastIndexOf(".") + 1); return str; } /** * ?? * * @param filePath * * @return ?? */ public static String getFileName(String filePath) { filePath = filePath.replace("\\", "/"); if (filePath.indexOf("/") != -1) { return filePath.substring(filePath.lastIndexOf("/") + 1); } return filePath; } /** * ? * * @param src * ? * @param dst * */ public static void copyFile(File src, File dst) { try { FileInputStream in = null; FileOutputStream out = null; try { out = new FileOutputStream(dst); in = new FileInputStream(src); byte[] buffer = new byte[1024]; int len = 0; while ((len = in.read(buffer)) > 0) { out.write(buffer, 0, len); } } catch (Exception e) { e.printStackTrace(); String dstpath = dst.getAbsolutePath(); if (dstpath.lastIndexOf("/") != -1) { dstpath = dstpath.subSequence(0, dstpath.lastIndexOf("/")).toString(); } else { dstpath = dstpath.subSequence(0, dstpath.lastIndexOf("\\")).toString(); } createDirectory(dstpath); copyFile(src, dst); } finally { if (null != in) { in.close(); } if (null != out) { out.close(); } } } catch (Exception e) { e.printStackTrace(); } } /** * ?? * * @param Directorypath */ public static void createDirectory(String Directorypath) { File file = new File(Directorypath); if (!file.exists()) { file.mkdir(); file.mkdirs(); } } /** * ?? * * @param dir */ public static String checkSaveDir(String dir) { File dirFile = new File(dir); boolean flag = true; if (!dirFile.exists()) { flag = dirFile.mkdirs(); } if (flag) return dirFile.getAbsolutePath(); else return null; } /** * * * @param files */ public static void deleteFile(File... files) { if (files == null) { return; } for (File f : files) { if (f.exists()) { f.delete(); } } } /** * * * @param file */ public static void deleteDirectory(File file) { if (file.exists()) { // ? if (file.isFile()) { // ? file.delete(); // delete() ? ??; } else if (file.isDirectory()) { // ? File[] files = file.listFiles(); // files[]; for (int i = 0; i < files.length; i++) { // ?? deleteDirectory(files[i]); // ? } } file.delete(); } else { System.out.println("??" + '\n'); } } // ??? public static String encodeDownloadFileName(String fileName, String agent) throws IOException { String codedfilename = null; if (agent != null) { agent = agent.toLowerCase(); } if (null != agent && -1 != agent.indexOf("msie")) { String prefix = fileName.lastIndexOf(".") != -1 ? fileName.substring(0, fileName.lastIndexOf(".")) : fileName; String extension = fileName.lastIndexOf(".") != -1 ? fileName.substring(fileName.lastIndexOf(".")) : ""; String name = prefix; int limit = 150 - extension.length(); if (name.getBytes().length != name.length()) {// zn if (getEncodingByteLen(name) >= limit) { name = subStr(name, limit); } } else {// en limit = prefix.length() > limit ? limit : prefix.length(); name = name.substring(0, limit); } name = URLEncoder.encode(name + extension, "UTF-8").replace('+', ' '); codedfilename = name; } else if (null != agent && -1 != agent.indexOf("firefox")) { codedfilename = "=?UTF-8?B?" + (new String(Base64.encodeBase64(fileName.getBytes("UTF-8")))) + "?="; } else if (null != agent && -1 != agent.indexOf("safari")) { codedfilename = new String(fileName.getBytes("UTF-8"), "ISO8859-1"); } else if (null != agent && -1 != agent.indexOf("applewebkit")) { codedfilename = new String(fileName.getBytes("UTF-8"), "ISO8859-1"); } else { codedfilename = URLEncoder.encode(fileName, "UTF-8").replace('+', ' '); } return codedfilename; } private static int getEncodingByteLen(String sub) { int zhLen = (sub.getBytes().length - sub.length()) * 2; int enLen = sub.length() * 2 - sub.getBytes().length; return zhLen + enLen; } // ??? private static String subStr(String str, int limit) { String result = str.substring(0, 17); int subLen = 17; for (int i = 0; i < limit; i++) { if (limit < getEncodingByteLen( str.substring(0, (subLen + i) > str.length() ? str.length() : (subLen)))) { result = str.substring(0, subLen + i - 1); break; } if ((subLen + i) > str.length()) { result = str.substring(0, str.length() - 1); break; } } return result; } @SuppressWarnings("rawtypes") public static String getAppPath(Class cls) { // ?? if (cls == null) throw new java.lang.IllegalArgumentException("???"); ClassLoader loader = cls.getClassLoader(); // ???? String clsName = cls.getName() + ".class"; // ? Package pack = cls.getPackage(); String path = ""; // ????? if (pack != null) { String packName = pack.getName(); // ??JavaJDK if (packName.startsWith("java.") || packName.startsWith("javax.")) throw new java.lang.IllegalArgumentException("????"); // ?????? clsName = clsName.substring(packName.length() + 1); // ????????? if (packName.indexOf(".") < 0) path = packName + "/"; else {// ??????? int start = 0, end = 0; end = packName.indexOf("."); while (end != -1) { path = path + packName.substring(start, end) + "/"; start = end + 1; end = packName.indexOf(".", start); } path = path + packName.substring(start) + "/"; } } // ClassLoadergetResource???? java.net.URL url = loader.getResource(path + clsName); // URL?? String realPath = url.getPath(); // ?????"file:" int pos = realPath.indexOf("file:"); if (pos > -1) realPath = realPath.substring(pos + 5); // ???? pos = realPath.indexOf(path + clsName); realPath = realPath.substring(0, pos - 1); // JARJAR?? if (realPath.endsWith("!")) realPath = realPath.substring(0, realPath.lastIndexOf("/")); /*------------------------------------------------------------ ClassLoadergetResourceutf-8?? ??? URLDecoderdecode? ? -------------------------------------------------------------*/ try { realPath = java.net.URLDecoder.decode(realPath, "utf-8"); } catch (Exception e) { throw new RuntimeException(e); } System.out.println("realPath----->" + realPath); return realPath; } /** * * @param file * @return */ public static String readFile(File file) { StringBuffer sb = new StringBuffer(); BufferedReader br = null; try { br = new BufferedReader(new InputStreamReader(new FileInputStream(file))); String data = null; while ((data = br.readLine()) != null) { sb.append(data).append("\n"); } br.close(); } catch (FileNotFoundException e) { throw new ServiceException("?", e); } catch (IOException e) { throw new ServiceException("?IO", e); } return sb.toString(); } /** * ? * @param file * @param charSet * @return */ public static String readFile(File file, String charSet) { StringBuffer sb = new StringBuffer(); BufferedReader br = null; try { br = new BufferedReader(new InputStreamReader(new FileInputStream(file), charSet)); String data = null; while ((data = br.readLine()) != null) { sb.append(data).append("\n"); } br.close(); } catch (FileNotFoundException e) { throw new ServiceException("?", e); } catch (IOException e) { throw new ServiceException("?IO", e); } return sb.toString(); } }