java文件操作的工具类

为了修改大量收藏的美剧文件名,用swing写了个小工具,代码是文件处理部分(netbeans的拖拽工具用起来挺麻烦的)
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 * and open the template in the editor.
 */
package datei.steuern;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author s.watson
 */
public class FileTools {

  public FileTools() {

  }

  /**
   * formatPath 转义文件目录
   *
   * @param path
   * @return
   */
  public static String formatPath(String path) {
    return path.replaceAll("\\\\", "/");
  }

  /**
   * combainPath文件路径合并
   *
   * @param eins
   * @param zwei
   * @return
   */
  private static String combainPath(String eins, String zwei) {
    String dori = "";
    eins = null == eins ? "" : formatPath(eins);
    zwei = null == zwei ? "" : formatPath(zwei);
    if (!eins.endsWith("/") && zwei.indexOf("/") != 0) {
      dori = eins + "/" + zwei;
    } else {
      dori = (eins + zwei).replaceAll("//", "/");
    }
    return dori;
  }

  /**
   * list2Array 列表转换数组
   *
   * @param list
   * @return
   */
  private static String[] list2Array(List list) {
    String array[] = (String[]) list.toArray(new String[list.size()]);
    return array;
  }

  /**
   * cp 复制文件
   *
   * @param source
   * @param destination
   * @param loop
   * @return
   */
  public static List<File> cp(String source, String destination, boolean loop) {
    List<File> list = new ArrayList();
    try {
      File srcFile = new File(source);
      File desFile = new File(destination);
      list.addAll(cp(srcFile, desFile, loop));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return list;
  }

  /**
   * cp 复制文件
   *
   * @param source
   * @param destination
   * @param loop
   * @return
   */
  public static List<File> cp(File source, File destination, boolean loop) {
    List<File> list = new ArrayList();
    try {
      if (!source.exists() || source.isDirectory()) {
        throw new FileNotFoundException();
      }
      list.add(cp(source, destination));
      if (loop) {
        String[] subFile = source.list();
        for (String subPath : subFile) {
          String src = combainPath(source.getPath(), subPath);//子文件原文件路径
          String des = combainPath(destination.getPath(), subPath);//子文件目标路径
          File subfile = new File(src);
          if (subfile.isFile()) {
            list.add(cp(src, des));
          } else if (subfile.isDirectory() && loop) {
            list.addAll(cp(src, des, loop));
          }
        }
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return list;
  }

  /**
   * cp 单文件复制文件
   *
   * @param source
   * @param destination
   * @return
   */
  public static File cp(String source, String destination) {
    File desFile = null;
    try {
      File srcFile = new File(source);
      desFile = new File(destination);
      desFile = cp(srcFile, desFile);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return desFile;
  }

  /**
   * cp 单文件复制文件
   *
   * @param source
   * @param destination
   * @return
   */
  public static File cp(File source, File destination) {
    FileInputStream in = null;
    FileOutputStream out = null;
    FileChannel inc = null;
    FileChannel outc = null;
    try {
      if (!source.exists() || source.isDirectory()) {
        throw new FileNotFoundException();
      }
      if (source.getPath().equals(destination.getPath())) {
        return source;
      }
      long allbytes = du(source, false);
      if (!destination.exists()) {
        destination.createNewFile();
      }
      in = new FileInputStream(source.getPath());
      out = new FileOutputStream(destination);
      inc = in.getChannel();
      outc = out.getChannel();
      ByteBuffer byteBuffer = null;
      long length = 2097152;//基本大小,默认2M
      long _2M = 2097152;
      while (inc.position() < inc.size()) {
        if (allbytes > (64 * length)) {//如果文件大小大于128M 缓存改为64M
          length = 32 * _2M;
        } else if (allbytes > (32 * length)) {//如果文件大小大于64M 缓存改为32M
          length = 16 * _2M;
        } else if (allbytes > (16 * length)) {//如果文件大小大于32M 缓存改为16M
          length = 8 * _2M;
        } else if (allbytes > (8 * length)) {//如果文件大小大于16M 缓存改为8M
          length = 4 * _2M;
        } else if (allbytes > (4 * length)) {//如果文件大小大于8M 缓存改为4M
          length = 2 * _2M;
        } else if (allbytes > (2 * length)) {//如果文件大小大于4M 缓存改为2M
          length = _2M;
        } else if (allbytes > (length)) {//如果文件大小大于2M 缓存改为1M
          length = _2M / 2;
        } else if (allbytes < length) {//如果文件小于基本大小,直接输出
          length = allbytes;
        }
        allbytes = inc.size() - inc.position();
        byteBuffer = ByteBuffer.allocateDirect((int) length);
        inc.read(byteBuffer);
        byteBuffer.flip();
        outc.write(byteBuffer);
        outc.force(false);
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    } finally {
      try {
        if (null != inc) {
          inc.close();
        }
        if (null != outc) {
          outc.close();
        }
        if (null != in) {
          in.close();
        }
        if (null != out) {
          out.close();
        }
      } catch (Exception ex) {
        j2log(null, null, ex);
      }
    }
    return destination;
  }

  /**
   * rename 文件重命名
   *
   * @param filePath
   * @param from
   * @param to
   * @return
   */
  public static File rename(String filePath, String from, String to) {
    File newFile = null;
    try {
      File oldFile = new File(combainPath(filePath, from));
      newFile = new File(combainPath(filePath, to));
      rename(newFile, oldFile);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return newFile;
  }

  /**
   * rename 文件重命名
   *
   * @param to
   * @param from
   * @return
   */
  public static File rename(File from, File to) {
    try {
      String newPath = to.getPath();
      String oldPath = from.getPath();
      if (!oldPath.equals(newPath)) {
        if (!to.exists()) {
          from.renameTo(to);
        }
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return to;
  }

  /**
   * mv 移动文件
   *
   * @param fileName
   * @param source
   * @param destination
   * @param cover
   */
  public static void mv(String fileName, String source, String destination, boolean cover) {
    try {
      if (!source.equals(destination)) {
        File oldFile = new File(combainPath(source, fileName));
        File newFile = new File(combainPath(destination, fileName));
        mv(oldFile, newFile, cover);
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * mv 移动文件
   *
   * @param source
   * @param destination
   * @param cover
   */
  public static void mv(String source, String destination, boolean cover) {
    try {
      if (!source.equals(destination)) {
        File oldFile = new File(source);
        File newFile = new File(destination);
        mv(oldFile, newFile, cover);
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * mv 移动文件
   *
   * @param source
   * @param destination
   * @param cover
   */
  public static void mv(File source, File destination, boolean cover) {
    try {
      if (!source.exists()) {
        throw new FileNotFoundException();
      }
      StringBuilder fileName = new StringBuilder(source.getName());
      if (!cover && source.getPath().equals(destination.getPath())) {
        if (fileName.indexOf(".") > 0) {
          fileName.insert(fileName.lastIndexOf("."), "_副本");
        } else {
          fileName.append("_副本");
        }
        cp(source, new File(combainPath(source.getParent(), fileName.toString())));
      } else {
        source.renameTo(destination);
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * extensions 获取文件扩展名信息
   *
   * @param filePath
   * @param fileName
   * @return
   */
  private static String[] extensions(String filePath, String fileName) {
    String[] extension = {};
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      extensions(file);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return extension;
  }

  /**
   * extensions 获取文件扩展名信息
   *
   * @param fullPath
   * @return
   */
  private static String[] extensions(String fullPath) {
    String[] extension = {};
    try {
      File file = new File(fullPath);
      extensions(file);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return extension;
  }

  /**
   * extensions 获取文件扩展名信息
   *
   * @param file
   * @return
   */
  private static String[] extensions(File file) {
    String[] extension = {};
    try {
      if (file.isFile()) {
        String fileName = file.getName();
        if (fileName.lastIndexOf(".") >= 0) {
          int lastIndex = fileName.lastIndexOf(".");
          extension[0] = String.valueOf(lastIndex);//扩展名的“.”的索引
          extension[1] = fileName.substring(lastIndex + 1);//扩展名
          extension[2] = fileName.substring(0, lastIndex);//文件名
        }
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return extension;
  }

  /**
   * ls 遍历文件
   *
   * @param filePath
   * @param loop
   * @return
   */
  public static List<File> ls(String filePath, boolean loop) {
    List<File> list = new ArrayList();
    try {
      File file = new File(filePath);
      list.addAll(ls(file, loop));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return list;
  }

  /**
   * ls 遍历文件
   *
   * @param file
   * @param loop
   * @return
   */
  public static List<File> ls(File file, boolean loop) {
    List<File> list = new ArrayList();
    try {
      list.add(file);
      if (!file.isDirectory()) {
        list.add(file);
      } else if (file.isDirectory()) {
        File[] subList = file.listFiles();
        subList = filesSort(subList, true);
        for (File subFile : subList) {
          if (subFile.isDirectory() && loop) {
            list.addAll(ls(subFile.getPath(), loop));
          } else {
            list.add(subFile);
          }
        }
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return list;
  }

  /**
   * filesSort 文件排序(默认升序)
   *
   * @param parentPath
   * @param subList
   * @return
   */
  private static File[] filesSort(File[] inFiles, boolean asc) {
    List<String> files = new ArrayList();
    List<String> dirs = new ArrayList();
    for (File subFile : inFiles) {
      if (subFile.isDirectory()) {
        dirs.add(subFile.getPath());
      } else if (subFile.isFile()) {
        files.add(subFile.getPath());
      }
    }
    String[] fileArray = {};
    if (files.size() > 0) {
      fileArray = list2Array(files);
      Arrays.sort(fileArray);
      if (!asc) {
        Arrays.sort(fileArray, Collections.reverseOrder());
      }
    }
    String[] dirArray = {};
    if (dirs.size() > 0) {
      dirArray = list2Array(dirs);
      Arrays.sort(dirArray);
      if (!asc) {
        Arrays.sort(dirArray, Collections.reverseOrder());
      }
    }
    return concat2FileArray(fileArray, dirArray);
  }

  /**
   * concat2FileArray 合并文件数组
   *
   * @param old1
   * @param old2
   * @return
   */
  private static File[] concat2FileArray(String[] old1, String[] old2) {
    File[] newArray = new File[old1.length + old2.length];
    for (int i = 0, n = old1.length; i < n; i++) {
      newArray[i] = new File(old1[i]);
    }
    for (int i = 0, j = old1.length, n = (old1.length + old2.length); j < n; i++, j++) {
      newArray[j] = new File(old2[i]);
    }
    return newArray;
  }

  /**
   * read 读取文本文件
   *
   * @param filePath
   * @param fileName
   * @param charset
   * @return
   */
  public static StringBuilder read(String filePath, String fileName, String charset) {
    StringBuilder sb = new StringBuilder();
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      sb.append(FileTools.tail(file, false, 0, charset));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return sb;
  }

  /**
   * read 读取文本文件
   *
   * @param fullPath
   * @param charset
   * @return
   */
  public static StringBuilder read(String fullPath, String charset) {
    StringBuilder sb = new StringBuilder();
    try {
      File file = new File(fullPath);
      sb.append(FileTools.tail(file, false, 0, charset));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return sb;
  }

  /**
   * read 读取文本文件
   *
   * @param file
   * @param charset
   * @return
   */
  public static StringBuilder read(File file, String charset) {
    StringBuilder sb = new StringBuilder();
    try {
      sb.append(FileTools.tail(file, false, 0, charset));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return sb;
  }

  /**
   * find 读取文本文件指定行
   *
   * @param filePath
   * @param fileName
   * @param line
   * @param charset
   * @return
   */
  public static StringBuilder find(String filePath, String fileName, int line, String charset) {
    StringBuilder sb = new StringBuilder();
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      sb.append(FileTools.tail(file, true, line, charset));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return sb;
  }

  /**
   * find 读取文本文件指定行
   *
   * @param fullPath
   * @param line
   * @param charset
   * @return
   */
  public static StringBuilder find(String fullPath, int line, String charset) {
    StringBuilder sb = new StringBuilder();
    try {
      File file = new File(fullPath);
      sb.append(FileTools.tail(file, true, line, charset));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return sb;
  }

  /**
   * find 读取文本文件指定行
   *
   * @param file
   * @param line
   * @param charset
   * @return
   */
  public static StringBuilder find(File file, int line, String charset) {
    StringBuilder sb = new StringBuilder();
    try {
      sb.append(FileTools.tail(file, true, line, charset));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return sb;
  }

  /**
   * tail 读取文本文件
   *
   * @param filePath
   * @param fileName
   * @param charset
   * @param find
   * @param line
   * @return
   */
  public static StringBuilder tail(String filePath, String fileName, boolean find, int line, String charset) {
    StringBuilder sb = new StringBuilder();
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      sb.append(FileTools.tail(file, find, line, charset));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return sb;
  }

  /**
   * tail 读取文本文件
   *
   * @param fullPath
   * @param charset
   * @param find
   * @param line
   * @return
   */
  public static StringBuilder tail(String fullPath, boolean find, int line, String charset) {
    StringBuilder sb = new StringBuilder();
    try {
      File file = new File(fullPath);
      sb.append(FileTools.tail(file, find, line, charset));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return sb;
  }

  /**
   * tail 读取文本文件
   *
   * @param file
   * @param charset
   * @param find
   * @param line
   * @return
   */
  public static StringBuilder tail(File file, boolean find, int line, String charset) {
    StringBuilder sb = new StringBuilder();
    BufferedReader bufferReader = null;
    if (null == charset || "".equals(charset)) {
      charset = "UTF-8";
    }
    try {
      if (!file.exists() || file.isDirectory()) {
        throw new FileNotFoundException();
      }
      String fullPath = file.getPath();
      bufferReader = new BufferedReader(new InputStreamReader(new FileInputStream(fullPath), charset));
      String temp;
      for (int i = 0; (temp = bufferReader.readLine()) != null; i++) {
        if (!find || line == i) {
          sb.append(temp);
        }
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    } finally {
      if (null != bufferReader) {
        try {
          bufferReader.close();
        } catch (IOException ex) {
          j2log(null, null, ex);
        }
      }
    }
    return sb;
  }

  /**
   * sed 读取文本文件
   *
   * @param filePath
   * @param fileName
   * @param charset
   * @return
   */
  public static List<String> sed(String filePath, String fileName, String charset) {
    List<String> list = new ArrayList();
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      list.addAll(FileTools.sed(file, charset));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return list;
  }

  /**
   * sed 读取文本文件
   *
   * @param fullPath
   * @param charset
   * @return
   */
  public static List<String> sed(String fullPath, String charset) {
    List<String> list = new ArrayList();
    try {
      File file = new File(fullPath);
      list.addAll(FileTools.sed(file, charset));
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return list;
  }

  /**
   * sed 读取文本文件
   *
   * @param file
   * @param charset
   * @return
   */
  public static List<String> sed(File file, String charset) {
    List<String> list = new ArrayList();
    BufferedReader bufferReader = null;
    if (null == charset || "".equals(charset)) {
      charset = "UTF-8";
    }
    try {
      if (!file.exists() || file.isDirectory()) {
        throw new FileNotFoundException();
      }
      String fullPath = file.getPath();
      bufferReader = new BufferedReader(new InputStreamReader(new FileInputStream(fullPath), charset));
      String temp;
      for (int i = 0; (temp = bufferReader.readLine()) != null; i++) {
        list.add(temp);
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    } finally {
      if (null != bufferReader) {
        try {
          bufferReader.close();
        } catch (IOException ex) {
          j2log(null, null, ex);
        }
      }
    }
    return list;
  }

  /**
   * cat 读取文本文件
   *
   * @param filePath
   * @param fileName
   * @return
   */
  public static byte[] cat(String filePath, String fileName) {
    byte[] output = {};
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      output = FileTools.cat(file);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return output;
  }

  /**
   * cat 读取文本文件
   *
   * @param fullPath
   * @return
   */
  public static byte[] cat(String fullPath) {
    byte[] output = {};
    try {
      File file = new File(fullPath);
      output = FileTools.cat(file);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return output;
  }

  /**
   * cat 读取文本文件
   *
   * @param file
   * @return
   */
  public static byte[] cat(File file) {
    InputStream in = null;
    byte[] output = {};
    try {
      if (!file.exists() || file.isDirectory()) {
        throw new FileNotFoundException();
      }
      String fullPath = file.getPath();
      long length = du(file, false);
      long _2M = 2097152;
      byte[] bytes = new byte[(int) length];
      in = new FileInputStream(fullPath);
      for (int count = 0; count != -1;) {
        if (length > 16 * _2M) {
          length = 4 * _2M;
        } else if (length > 8 * _2M) {
          length = 2 * _2M;
        } else if (length > 4 * _2M) {
          length = _2M;
        } else if (length > 2 * _2M) {
          length = _2M / 2;
        } else if (length > _2M) {
          length = _2M / 4;
        } else {
          length = 4096;
        }
        bytes = new byte[(int) length];
        count = in.read(bytes);
        output = concatArray(bytes, output);
        length = in.available();
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    } finally {
      if (null != in) {
        try {
          in.close();
        } catch (Exception ex) {
          j2log(null, null, ex);
        }
      }
    }
    return output;
  }

  /**
   * 合并数组
   *
   * @param old1
   * @param old2
   * @return
   */
  private static byte[] concatArray(byte[] old1, byte[] old2) {
    byte[] newArray = new byte[old1.length + old2.length];
    System.arraycopy(old1, 0, newArray, 0, old1.length);
    System.arraycopy(old2, 0, newArray, old1.length, old2.length);
    return newArray;
  }

  /**
   * dd 写入文件fullPath内容content
   *
   * @param filePath
   * @param fileName
   * @param content
   * @param isAppend
   */
  public static void dd(String filePath, String fileName, byte[] content, boolean isAppend) {
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      FileTools.dd(file, content, isAppend);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * dd 写入文件fullPath内容content
   *
   * @param fullPath
   * @param content
   * @param isAppend
   */
  public static void dd(String fullPath, byte[] content, boolean isAppend) {
    try {
      File file = new File(fullPath);
      FileTools.dd(file, content, isAppend);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * dd 写入文件fullPath内容content
   *
   * @param file
   * @param content
   * @param isAppend
   */
  public static void dd(File file, byte[] content, boolean isAppend) {
    FileOutputStream fileOutputStream = null;
    try {
      if (!file.exists()) {
        file.createNewFile();
      }
      fileOutputStream = new FileOutputStream(file, isAppend);
      fileOutputStream.write(content);
    } catch (Exception ex) {
      j2log(null, null, ex);
    } finally {
      try {
        if (null != fileOutputStream) {
          fileOutputStream.close();
        }
      } catch (IOException ex) {
        j2log(null, null, ex);
      }
    }
  }

  /**
   * write 写文件内容content到文件fullPath
   *
   * @param filePath
   * @param fileName
   * @param content
   */
  public static void write(String filePath, String fileName, String content) {
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      FileTools.write(file, content, true);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * write 写文件内容content到文件fullPath
   *
   * @param fullPath
   * @param content
   */
  public static void write(String fullPath, String content) {
    try {
      File file = new File(fullPath);
      FileTools.write(file, content, true);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * write 写文件内容content到文件fullPath
   *
   * @param file
   * @param content
   */
  public static void write(File file, String content) {
    try {
      FileTools.write(file, content, true);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * write 写(追加)文件内容content到文件fullPath
   *
   * @param filePath
   * @param fileName
   * @param content
   * @param isAppend
   */
  public static void write(String filePath, String fileName, String content, boolean isAppend) {
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      FileTools.write(file, content, isAppend);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * write 写(追加)文件内容content到文件fullPath
   *
   * @param fullPath
   * @param content
   * @param isAppend
   */
  public static void write(String fullPath, String content, boolean isAppend) {
    try {
      File file = new File(fullPath);
      FileTools.write(file, content, isAppend);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * write 写(追加)文件内容content到文件fullPath
   *
   * @param file
   * @param content
   * @param isAppend
   */
  public static void write(File file, String content, boolean isAppend) {
    FileWriter fileWriter = null;
    try {
      if (!file.exists()) {
        file.createNewFile();
      }
      fileWriter = new FileWriter(file.getPath(), isAppend);
      fileWriter.write(content);
    } catch (Exception ex) {
      j2log(null, null, ex);
    } finally {
      if (null != fileWriter) {
        try {
          fileWriter.close();
        } catch (IOException ex) {
          j2log(null, null, ex);
        }
      }
    }
  }

  /**
   * tail 添加文件内容content到文件的index位置
   *
   * @param filePath
   * @param fileName
   * @param content
   * @param index
   */
  public static void tail(String filePath, String fileName, String content, long index) {
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      FileTools.tail(file, content, index);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * tail 添加文件内容content到文件的index位置
   *
   * @param fullPath
   * @param content
   * @param index
   */
  public static void tail(String fullPath, String content, long index) {
    try {
      File file = new File(fullPath);
      FileTools.tail(file, content, index);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * tail 添加文件内容content到文件的index位置
   *
   * @param file
   * @param content
   * @param index
   */
  public static void tail(File file, String content, long index) {
    RandomAccessFile randomAccessFile = null;
    try {
      if (!file.exists()) {
        file.createNewFile();
      }
      randomAccessFile = new RandomAccessFile(file.getPath(), "rw");
      randomAccessFile.seek(index);
      randomAccessFile.writeBytes(content);
    } catch (Exception ex) {
      j2log(null, null, ex);
    } finally {
      if (null != randomAccessFile) {
        try {
          randomAccessFile.close();
        } catch (Exception ex) {
          j2log(null, null, ex);
        }
      }
    }
  }

  /**
   * mkdir 创建目录
   *
   * @param filePath
   * @param fileName
   * @return
   */
  public static File mkdir(String filePath, String fileName) {
    File file = null;
    try {
      String fullPath = combainPath(filePath, fileName);
      file = new File(fullPath);
      file = mkdir(file);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return file;
  }

  /**
   * mkdir 创建目录
   *
   * @param fullPath
   * @return
   */
  public static File mkdir(String fullPath) {
    File file = null;
    try {
      file = new File(fullPath);
      file = mkdir(file);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return file;
  }

  /**
   * mkdir 创建目录
   *
   * @param file
   * @return
   */
  public static File mkdir(File file) {
    try {
      if (!file.exists()) {
        file.mkdir();//如果文件夹不存在则创建
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return file;
  }

  /**
   * touch 创建文件
   *
   * @param filePath
   * @param fileName
   */
  public static void touch(String filePath, String fileName) {
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      touch(file);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * touch 创建文件
   *
   * @param fullPath
   */
  public static void touch(String fullPath) {
    try {
      File file = new File(fullPath);
      touch(file);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * touch 创建文件
   *
   * @param file
   */
  public static void touch(File file) {
    try {
      if (!file.exists()) {
        file.createNewFile();//如果文件不存在则创建
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * rm 删除文件
   *
   * @param filePath
   * @param fileName
   */
  public static void rm(String filePath, String fileName) {
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      rm(file);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * rm 删除文件
   *
   * @param fullPath
   */
  public static void rm(String fullPath) {
    try {
      File file = new File(fullPath);
      rm(file);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * rm 删除文件
   *
   * @param file
   */
  public static void rm(File file) {
    try {
      if (!file.exists()) {
        throw new FileNotFoundException();
      }
      if (file.isFile()) {
        file.delete();
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * rmdir 删除目录
   *
   * @param filePath
   * @param fileName
   * @param loop
   */
  public static void rmdir(String filePath, String fileName, boolean loop) {
    try {
      String fullPath = combainPath(filePath, fileName);
      File dir = new File(fullPath);
      rmdir(dir, loop);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * rmdir 删除目录
   *
   * @param fullPath
   * @param loop
   */
  public static void rmdir(String fullPath, boolean loop) {
    try {
      File dir = new File(fullPath);
      rmdir(dir, loop);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * rmdir 删除目录
   *
   * @param dir
   * @param loop
   */
  public static void rmdir(File dir, boolean loop) {
    try {
      if (!dir.exists()) {
        throw new FileNotFoundException();
      }
      if (dir.isDirectory()) {
        File[] files = dir.listFiles();
        int length = files.length;
        for (int i = 0; i < length && loop; i++) {
          if (files[i].isDirectory()) {
            rmdir(files[i], loop);
          } else {
            rm(files[i]);
          }
        }
        if (loop || length == 0) {
          dir.delete();
        }
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
  }

  /**
   * du 获取文件实际大小
   *
   * @param filePath
   * @param fileName
   * @param loop
   * @return
   */
  public static long du(String filePath, String fileName, boolean loop) {
    long size = 0;
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      size = du(file, loop);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return size;
  }

  /**
   * du 获取文件实际大小
   *
   * @param filePath
   * @param fileName
   * @return
   */
  public static long du(String filePath, String fileName) {
    long size = 0;
    try {
      String fullPath = combainPath(filePath, fileName);
      File file = new File(fullPath);
      size = du(file, false);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return size;
  }

  /**
   * du 获取文件实际大小
   *
   * @param fullPath
   * @return
   */
  public static long du(String fullPath) {
    long size = 0;
    try {
      File file = new File(fullPath);
      size = du(file, false);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return size;
  }

  /**
   * du 获取文件实际大小
   *
   * @param file
   * @return
   */
  public static long du(File file) {
    long size = 0;
    try {
      size = du(file, false);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return size;
  }

  /**
   * du 获取文件实际大小
   *
   * @param fullPath
   * @param loop
   * @return
   */
  public static long du(String fullPath, boolean loop) {
    long size = 0;
    try {
      File file = new File(fullPath);
      size = du(file, loop);
    } catch (Exception ex) {
      j2log(null, null, ex);
    }
    return size;
  }

  /**
   * du 获取文件实际大小
   *
   * @param file
   * @param loop
   * @return
   */
  public static long du(File file, boolean loop) {
    FileChannel fileChannel = null;
    long size = 0;
    try {
      if (!file.exists()) {
        throw new FileNotFoundException();
      }
      if (file.isFile()) {
        FileInputStream fis = new FileInputStream(file);
        fileChannel = fis.getChannel();
        size = fileChannel.size();
      } else if (file.isDirectory()) {
        File[] files = file.listFiles();
        int length = files.length;
        for (int i = 0; i < length && loop; i++) {
          if (files[i].isDirectory()) {
            du(files[i], loop);
          } else {
            size += du(files[i], false);
          }
        }
      }
    } catch (Exception ex) {
      j2log(null, null, ex);
    } finally {
      if (null != fileChannel) {
        try {
          fileChannel.close();
        } catch (Exception ex) {
          j2log(null, null, ex);
        }
      }
    }
    return size;
  }
}
编程技巧