文件的处理
package my.util;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.ByteArrayInputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.ObjectInputStream;import java.io.ObjectOutput;import java.io.ObjectOutputStream;import java.io.OutputStreamWriter;import java.io.Writer;import java.io.InputStream;public class FileUtil{/** * String 转化为 InputStream * @param str * @return */public static InputStream StringToInputStream(String str){ByteArrayInputStream stream = new ByteArrayInputStream(str.getBytes());return stream;}/** * byte[] 转化为 InputStream * @param str * @return */public static InputStream ByteToInputStream(byte[] b){ByteArrayInputStream stream = new ByteArrayInputStream(b);return stream;}/** * InputStream 转化为 String * @param is * @return */public static String InputStreamToString(InputStream is){try{BufferedReader in = new BufferedReader(new InputStreamReader(is));StringBuffer buffer = new StringBuffer();String line = "";while ((line = in.readLine()) != null){buffer.append(line + "\r\n");}in.close();return buffer.toString();}catch (Exception ex){return null;}}/** * 根据文件夹路径创建文件夹 * @param filePath */public static void createFolder(File file){if (!file.exists()){file.mkdirs();}}/** * 根据文件路径或文件夹路径创建文件夹 * @param filePath */public static void createFolder(String filePath){File f = new File(filePath);createFolder(f);}/** * 根据文件路径或文件夹路径创建所属目录(父)路径 * @param filePath */public static void createParentFolder(String filePath){File file = new File(filePath);createParentFolder(file);}/** * 根据文件路径或文件夹路径创建所属目录(父)路径 * @param filePath */public static void createParentFolder(File file){createFolder(file.getParent());}/** * 读取文件(只支持文本文件) * @param file 文件 * @return */public static String readFile(File file){try{if(!file.exists() || file.isDirectory()) return "";String s = InputStreamToString(new FileInputStream(file));if(s == null) return "";return s;}catch (IOException e){e.printStackTrace();return "";}}/** * 读取文件(只支持文本文件) * @param fileName 文件名称 * @return */public static String readFile(String fileName){if(fileName == null) return "";File file = new File(fileName);return readFile(file);}/** * 将指定文件流写入指定的file对象 * @param file * @param fin * @param override 是否覆盖 * @return 成功返回true,失败返回false */public static boolean writeFile(File file, InputStream fin, boolean override){try{if(!override && file.exists()) return false;if(file.exists() && file.isDirectory()) return false;// 将该数据流写入到指定文件中FileOutputStream fout = new FileOutputStream(file);byte[] buffer = new byte[4096];// To hold file contentsint bytes_read;while ((bytes_read = fin.read(buffer)) != -1)// Read until EOF{fout.write(buffer, 0, bytes_read);}if (fin != null){try{fin.close();}catch (IOException e){return false;}}if (fout != null){try{fout.close();}catch (IOException e){return false;}}return true;}catch (IOException ex){ex.printStackTrace();}return false;}/** * 写入文件 * @param file 文件对象 * @param content 文件内容 * @param override 是否覆盖 * @return 成功返回true,失败返回false */public static boolean writeFile(File file, String content, boolean override){if (content == null) content = "";return writeFile(file, StringToInputStream(content), override);}/** * 写入文件 * @param fileName 文件名称(全路径) * @param content 文件内容 * @param override 是否覆盖 * @return 成功返回true,失败返回false */public static boolean writeFile(String fileName, String content, boolean override){try{if (fileName == null || fileName.trim().length() == 0) return false;File file = new File(fileName);return writeFile(file, content, override);}catch (Exception e){e.printStackTrace();return false;}}/** * 写入文件 * @param file 文件对象 * @param content 文件内容 * @return 成功返回true,失败返回false */public static boolean writeFile(File file, String content){return writeFile(file, content, true);}/** * 写入文件 * @param fileName 文件名称(全路径) * @param content 文件内容 * @param override 是否覆盖 * @return 成功返回true,失败返回false */public static boolean writeFile(String fileName, String content){return writeFile(fileName, content, true);}/** * @param from 源文件或文件夹对象 * @param to 目标文件或文件夹对象 */public static void copy(File from, File to){copy(from, to, true, true);}/** * @param from 源文件或文件夹路径 * @param to 目标文件或文件夹路径 */public static void copy(String from, String to){copy(from, to, true, true);}/** * @param from 源文件或文件夹路径 * @param to 目标文件或文件夹路径 * @param override 复制过程中遇到已存在的文件夹或文件是否覆盖改写，默认为true:覆盖 * @param copySubdir 复制文件夹时，是否复制子文件夹，默认为true */public static void copy(String from, String to, boolean override, boolean copySubdir){File fromFile = new File(from);File toFile = new File(to);copy(fromFile, toFile, override, copySubdir);}/** * from复制到to * @param from 源文件或文件夹对象 * @param to 目标文件或文件夹对象 * @param override 复制过程中遇到已存在的文件夹或文件是否覆盖改写，默认为true:覆盖 * @param copySubdir 复制文件夹时，是否复制子文件夹，默认为true * @return */public static void copy(File from, File to, boolean override, boolean copySubdir){if (from == null || to == null)return;if (!from.exists())return;// 源文件或文件夹不存在if (from.isDirectory()){if (to.exists())// 当目标已存在{if (to.isFile())// 文件夹不能复制到文件中{return;}if (!override)return;// 当目标已存在，且不能覆盖时}if (!to.exists())to.mkdirs();String[] fileList = from.list();if (fileList == null)return;for (int i = 0; i < fileList.length; i++){File f = new File(from.getAbsoluteFile() + "/" + fileList[i]);if (f.isDirectory() && !copySubdir)continue;// 不复制子目录File t = new File(to.getAbsoluteFile() + "/" + fileList[i]);copy(f, t, override, copySubdir);}}else if (from.isFile()){copyFile(from, to, override);}}/** * 复制文件from复制到to * @param from 源文件或文件夹对象 * @param to 目标文件或文件夹对象 * @param override * @return 返回复制结果 */public static boolean copyFile(File from, File to, boolean override){boolean fail = false;try{if (from.exists() && from.isFile() && !(to.exists() && to.isDirectory())){if (!override && to.exists()) return fail;// 当目标已存在，且不能覆盖时if (!to.exists()){String filePath = to.getParent();File f = new File(filePath);f.mkdirs();}return writeFile(to, (new FileInputStream(from)), override);}}catch (Exception ex){ex.printStackTrace();}return fail;}/** * 删除整个文件夹 * @param dir * @return */public static boolean deleteDir(String dirPath){File dir = new File(dirPath);return delete(dir, true, true, false);}/** * 删除整个文件夹 * @param dir * @return */public static boolean deleteDir(File dir){return delete(dir, true, true, false);}/** * 删除整个文件夹下的所有文件和子文件夹,该文件夹不删除 * @param dir * @return */public static boolean clearDir(String dirPath){File dir = new File(dirPath);return delete(dir, false, true, false);}/** * 删除整个文件夹下的所有文件和子文件夹,该文件夹不删除 * @param dir * @return */public static boolean clearDir(File dir){return delete(dir, false, true, false);}/** * 只删除整个文件夹下的所有文件(包括子目录),目录结构不删除 * @param dir * @return */public static boolean deleteAllFiles(String dirPath){File dir = new File(dirPath);return delete(dir, false, true, true);}/** * 只删除整个文件夹下的所有子文件夹(包括子目录), 目录结构不删除 * @param dir * @return */public static boolean deleteAllFiles(File dir){return delete(dir, false, true, true);}/** * 删除 * @param dir 删除的文件夹或文件 * @param isDeleteDir 是否删除此文件夹（只在删除对象为文件夹时此值有效） isDeleteDir有效且值为false时以下参数有效 * @param isDeleteSubDir 是否删除子文件夹 * @param isKeepStructure 是否保留子文件夹的目录结构 * @return */public static boolean delete(File file, boolean isDeleteDir, boolean isDeleteSubDir, boolean isKeepStructure){if (file.isDirectory()){String[] children = file.list();for (int i = 0; i < children.length; i++){File subFile = new File(file, children[i]);if (isDeleteDir || subFile.isFile()){boolean success = delete(subFile, true, true, false);if (!success){return false;}}else{if (isDeleteSubDir)// 是否删除子目录{boolean success = delete(subFile, !isKeepStructure, true, isKeepStructure);if (!success){return false;}}}}if (isDeleteDir)return file.delete();return true;}return file.delete();}public static File getFile(String path){try{File f = new File(path);return f;}catch(NullPointerException e){e.printStackTrace();return null;}}/** * 根据目录取得文件列表 * @param path * @return */public static File[] getFiles(String path){File file = new File(path);return file.listFiles();}/** * 判断是否已存在同名文件,存在同名文件则重名为"原文件名(数字).原扩展名" * @param fileName 文件名 * @param realPath 真实路径 * @return */public static String getRefrainFileName(String fileName, String realPath){if (fileName == null || fileName.trim().length() == 0)return "";String arrFileName[];arrFileName = fileName.split("[.]");// 正则表达式String fileExt = arrFileName[arrFileName.length - 1];// 文件扩展名String _fileName = fileName;// 保存新的文件名int countLogger = 1;// 记数器realPath = realPath + "/";File file = new File(realPath + fileName);// 读入文件对象while (file.exists())// 判断文件是否存在{int fileNameLength = fileName.lastIndexOf(".");if (fileNameLength >= 0 && fileNameLength < fileName.length()){_fileName = fileName.substring(0, fileNameLength) + "(" + countLogger + ")" + "." + fileExt;}else{_fileName = _fileName + "(" + countLogger + ")";}countLogger++;file = new File(realPath + _fileName);// 重新读入文件对象}return _fileName;}/** * 返回指定文件夹或文件的大小,单位bit * @param path * @return */public static long getDirSize(String path){long rtnSize = 0;File file = new File(path);if (!file.exists()){return rtnSize;}if (!file.isDirectory()){return file.length();}String[] tempList = file.list();File temp = null;for (int i = 0; i < tempList.length; i++){if (path.endsWith(File.separator)){temp = new File(path + tempList[i]);}else{temp = new File(path + File.separator + tempList[i]);}if (temp.isFile()){rtnSize += temp.length();}if (temp.isDirectory()){double inttemp = getDirSize(path + "/" + tempList[i]);rtnSize += inttemp;// 先叠加子文件夹里面的文件}}return rtnSize;}/** * 序列化对象到文件 * @param obj * @param fileName */public static void serializeToFile(Object obj, String fileName){try{ObjectOutput out = new ObjectOutputStream(new FileOutputStream(fileName));out.writeObject(obj);out.close();}catch (IOException e){e.printStackTrace();}}/** * 从文件反序列化出对象 * @param fileName * @return */public static Object deserializeFromFile(String fileName){try{File file = new File(fileName);ObjectInputStream in = new ObjectInputStream(new FileInputStream(file));Object obj = in.readObject();in.close();return obj;}catch (Exception e){e.printStackTrace();return null;}}/** * 取得文件后缀名,文件不存在则返回null,没后缀名则返回"" * @param file * @return */public static String getFileExt(File file){try{if(file.isFile()){String name = file.getName();int len = name.lastIndexOf(".");if(len != -1)return name.substring(len + 1);return "";}return null;}catch (Exception ex){ex.printStackTrace();}return null;}}