Java文件处理类

包含一些对文件的基本操作。    import java.io.*;  import java.util.ArrayList;  import java.util.List;    public class fileTest {    static int countFiles=0;  static int countFolders=0;    public static void  createFile(String filepath)  {  File file=new File(filepath);  if(file.exists())  {  System.out.println("目标文件已经存在!");  return;  }  if(filepath.endsWith(File.separator))  {  System.out.println("目标文件不能为目录!");  return;  }  try {  if(file.createNewFile())  System.out.println("文件创建成功!");  else  {  System.out.println("文件创建失败!");  return;  }  } catch (IOException e) {  // TODO Auto-generated catch block  e.printStackTrace();  }  }    public static void createDir(String dirname)  {  if(!dirname.endsWith(File.separator))  dirname=dirname+File.separator;  File dir=new File(dirname);  if(dir.exists())  {  System.out.println("目录已存在!");  return;  }  if(dir.mkdirs())  System.out.println("目录创建成功!");  else  {  System.out.println("目录创建失败!");  return;  }  }    public static boolean checkDirExist(String dirname)  {  File file=new File(dirname);  if(file.exists())  {  if(file.isDirectory())  return true;  }  return false;  }    public static File[] getDirFiles(String dirname)  {  File[] result=null;  File fileDir = new File(dirname);  if (!fileDir.exists())   {  System.out.println("文件夹不存在");  return null;  }  else  {  if (!fileDir.isDirectory())   {  fileDir = new File(fileDir.getParent());  }  result = fileDir.listFiles();  }  return result;  }    public static void deleteFiles(String filename)  {  File file=new File(filename);  if(!file.exists())  {  System.out.println("文件不存在!");  return;  }  if(file.delete())  {  System.out.println(filename+"文件删除成功!");  }  }    public static void deleteDirs(String dirname)  {  if(!dirname.endsWith(File.separator))  dirname=dirname+File.separator;  File dirn=new File(dirname);  if(!dirn.exists())  {  System.out.println("文件目录不存在!");  return;  }  File[] files=dirn.listFiles();  for(int i=0;i<files.length;i++)  {  if(files[i].isFile())  {  deleteFiles(files[i].getAbsolutePath());  }  else  deleteDirs(files[i].getAbsolutePath());  }  if(dirn.delete())  {  System.out.println("目录删除成功!");  }  }    public static void searchFiles(String dirname,String filename)  {  if(!dirname.endsWith(File.separator))  dirname=dirname+File.separator;  File dir=new File(dirname);  if(!dir.exists())  {  System.out.println("该文件夹不存在");  return;  }  File[] files=dir.listFiles();  for(int i=0;i<files.length;i++)  {  if(files[i].isFile())  {  if(files[i].getName().equals(filename))  System.out.println("文件路径为:"+files[i].getAbsolutePath());  }  else  {  searchFiles(files[i].getAbsolutePath(),filename);  }  }  }    public static File[] searchFile(File folder,final String keyWord)  {      File[] subFolders=folder.listFiles(new FileFilter()  {  public boolean accept(File pathname)  {  if(pathname.isFile())  countFiles++;  else  countFolders++;  if(pathname.isDirectory()||(pathname.isFile()&&pathname.getName().contains(keyWord)))  return true;  return false;  }    });  List<File> result=new ArrayList<File>();  for(int i=0;i<subFolders.length;i++)  {  if(subFolders[i].isFile())  result.add(subFolders[i]);  else  {  File[] foldResult=searchFile(subFolders[i],keyWord);  for(int j=0;j<foldResult.length;j++)  result.add(foldResult[j]);  }  }  File files[]=new File[result.size()];  result.toArray(files);  return files;  }    public static void copyFileToFile(File tofile,File fromfile)  {  if(tofile.exists())  {  System.out.println("文件已经存在!");  return;  }   else  {  try {  tofile.createNewFile();  } catch (IOException e) {  // TODO Auto-generated catch block  e.printStackTrace();  }  }  System.out.println("复制文件从"+fromfile.getAbsolutePath()+"到"+tofile.getAbsolutePath());  try {  InputStream is=new FileInputStream(fromfile);  FileOutputStream fos=new FileOutputStream(tofile);  byte []buffer=new byte[1024];  try {  while(is.read(buffer)!=-1)  fos.write(buffer);  is.close();  fos.close();  } catch (IOException e) {  // TODO Auto-generated catch block  e.printStackTrace();  }  } catch (FileNotFoundException e) {  // TODO Auto-generated catch block  e.printStackTrace();  }  }    /**  * @param file 要复制的文件  * @param dirname 文件复制到目标目录  */  public static void copyFileToDir(File file,String dirname)  {  createDir(dirname);  String filename=dirname+"/"+file.getName();  File nfile=new File(filename);  copyFileToFile(nfile,file);  }    public static void copyDirToDir(String todir,String fromdir)  {  File []f=getDirFiles(fromdir);  for(int i=0;i<f.length;i++)  {  if(f[i].isFile())  copyFileToDir(f[i],todir);  else  copyDirToDir(todir+"/"+f[i].getName(),fromdir+"/"+f[i].getName());  }  System.out.println(fromdir+"复制到文件夹"+todir+"复制完成!");  }        /**  * @param args  * @throws IOException   */  public static byte[] readFilebyByte(String filename) throws IOException  {  byte[] result = null;  File file = new File(filename);  if (file.exists() && file.isFile() && file.length() > 0)   {  result = new byte[(int) file.length()];  FileInputStream inStream = new FileInputStream(filename);  inStream.read(result);  inStream.close();  }  return result;  }    public static void readFilebyLine(String filename) throws IOException  {  File file=new File(filename);  BufferedReader reader=null;  System.out.println("以行为单位读取数据,一次读取一行:");  try {  reader=new BufferedReader(new FileReader(file));  String temp=null;  int line=1;  while((temp=reader.readLine())!=null)  {  System.out.println("line"+line+":"+temp);  line++;  }  reader.close();  } catch (FileNotFoundException e) {  // TODO Auto-generated catch block  e.printStackTrace();  }  }      public static void writeFilebyByte(String filename) throws IOException  {  String content="fsfni ds dw wod";  File file=new File(filename);  OutputStream out=null;  System.out.println("以字节为单位写入文件:"+content);  out=new FileOutputStream(file);  byte []bytes=content.getBytes();  out.write(bytes);  out.close();  }    public static void writeFilebyChar(String filename) throws IOException  {  String content="fsfni ds dw wod";  File file=new File(filename);  Writer writer=null;  System.out.println("以字符为单位写入文件:"+content);  writer=new OutputStreamWriter(new FileOutputStream(file));  writer.write(content);  writer.close();  }    public static void writeFilebyLine(String filename) throws IOException  {  String content="fsfni ds dw wod";  File file=new File(filename);  PrintWriter writer=null;  System.out.println("以行为单位写入文件:"+content);  writer=new PrintWriter(new FileOutputStream(file));  writer.println(content);  writer.print(2355);  writer.flush();  writer.close();  }    public static void addContent1(String filename) throws IOException  {  FileWriter writer=new FileWriter(filename,true);  String content="this is a nice man,so you should get it";  writer.write(content);  writer.close();  }    public static void addContent2(String filename) throws IOException  {  RandomAccessFile rfile=new RandomAccessFile(filename, "rw");  long filelength=rfile.length();  rfile.seek(filelength);  String content="hello world";  rfile.write(content.getBytes("gb2312"));  rfile.close();    }  /**  * @param args  * @throws IOException   */  public static void main(String[] args) throws IOException {  // TODO Auto-generated method stub      String dirname="c:/cc/";  String todir="c:/dd/";  String tdir="c:/ee/";  String fn="c:/cc/c.txt";  String filename="ww.txt";  File folder=new File("c:/cc/");  String keyword="ww";  //readFilebyLine(fn);  writeFilebyLine(fn);  addContent1(fn);  addContent2(fn);  //File fromfile=new File("c:/cc/c.txt");  //File tofile=new File("e:/ccc.txt");  //byte[] fb=readFilebyByte(fn);  //for(int i=0;i<fb.length;i++)  // System.out.println((char)fb[i]);  //System.out.println(fb.toString());  //copyFile(tofile,fromfile);  //copyFileToDir(fromfile,todir);  //copyDirToDir(tdir,dirname);  //File[] f=searchFile(folder,keyword);  //createDir(dirname);  //deleteDirs(dirname);  //searchFiles(dirname, filename);  //File[] f=getDirFiles(dirname);  //for(int i=0;i<f.length;i++)  {  // System.out.println(f[i].getAbsolutePath());  }  }      }
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Java文件处理类
