谁有空帮我写一个文件操作的小程序吧

Question

http://www.csdn.net/develop/read_article.asp?id=19064

Answer 1

package mytool;import java.io.*;
import java.util.*;public class FileOperator {
    public FileOperator() {}    /**
     *  Function: move file(only move file)
     *  parameter: strSourceFileName:specified completed file path
     *          strDestDir:       move to specified folder
     *  return: success true; faild false
     */
    public static boolean copyTo(String strSourceFileName,
                          String strDestDir) {
        File fileSource = new File(strSourceFileName);
        File fileDest = new File(strDestDir);        //if the source file don't exist or it is folder
        if (!fileSource.exists() || fileSource.isDirectory()) {
            System.out.println("error: FileOperator.java copyTo function,\nreasons: source file[" +
                               strSourceFileName + "],don't exist or it is folder!");
            return false;
        }        // if target folder dosn't exist
        if (!fileDest.isDirectory() || !fileDest.exists()) {
            if (!fileDest.mkdirs()) {
                System.out.println(
                    "error: FileOperator.java copyTo function,\nreasons:target"
                    + " folder dosn't exit, the operation faild when create target folder!");
                return false;
            }
        }        try {
            String strAbsFilename = strDestDir + File.separator +
                fileSource.getName();            FileInputStream fileInput = new FileInputStream(strSourceFileName);
            FileOutputStream fileOutput = new FileOutputStream(strAbsFilename);            //System.out.println("begin copy file:");            int i = 0;
            int count = -1;            long nWriteSize = 0;
            long nFileSize = fileSource.length();            byte[] data = new byte[BUFFER];            //System.out.println("FILE NAME \t\t FILE SIZE");
            System.out.println(fileSource.getName() + "\t\t" + nFileSize +
                               " byte");            while ( -1 != (count = fileInput.read(data, 0, BUFFER))) {                fileOutput.write(data, 0, count);                nWriteSize += count;                long size = (nWriteSize * 100) / nFileSize;
                long t = nWriteSize;                String msg = null;                if (size <= 100 && size >= 0) {
                    msg = "\rcopy process: " + size + "% \t" + "\t copied: " + t;
                    System.out.print(msg);
                } else if (size > 100) {
                    msg = "\rcopy process: " + 100 + "% \t" + "\t copied: " + t;
                    System.out.print(msg);
                }            }            fileInput.close();
            fileOutput.close();            System.out.println("\ncopy success!");
            return true;        } catch (Exception e) {
            System.out.println("exception message[");
            e.printStackTrace();
            System.out.println("exception message]");
            return false;
        }
    }    /**
     * functin: delete specified file
     * parameter: completed file path's file name strFileName
     * retrun: delete success true faild false;
     */
    public static boolean delete(String strFileName) {
        File fileDelete = new File(strFileName);        if (!fileDelete.exists() || fileDelete.isFile()) {
            System.out.println("error: " + strFileName + "unexist!");
            return false;
        }        return fileDelete.delete();
    }    /**
     *  function: move file(only move file)
     *  parameter: strSourceFileName:  specified completed file path name
     *          strDestDir:         target folder
     *  return : success true;       faild false
     */
    public static boolean moveFile(String strSourceFileName,
                            String strDestDir) {
        if (copyTo(strSourceFileName, strDestDir)) {
            return FileOperator.delete(strSourceFileName);
        } else {
            return false;
        }
    }    /**
     *  function: create folder
     *  parameter: strDir      folder name of by created
     *  return : success true; fail false
     */
    public static boolean makedir(String strDir) {
        File fileNew = new File(strDir);        if (!fileNew.exists()) {
            return fileNew.mkdirs();
        } else {
            return true;
        }
    }    /**
     *  function: delete folder
     *  parameter: strDir      deleted folder name
     *  return: success true; fail false
     */
    public static boolean rmdir(String strDir) {
        File rmDir = new File(strDir);
        if (rmDir.isDirectory() && rmDir.exists()) {
            String[] fileList = rmDir.list();            int size = fileList.length;
            for (int i = 0; i < size; i++) {
                String subFile = strDir + File.separator + fileList[i];
                File tmp = new File(subFile);
                if (tmp.isFile()) {
                    tmp.delete();
                } else if (tmp.isDirectory()) {
                    rmdir(subFile);
                } else {
                    System.out.println("error!");
                }
            }
            rmDir.delete();
        } else {
            return false;
        }
        return true;
    }    // member variable    private static final int BUFFER = 1024;    // member variable
}

Answer 2

import java.io.*;public class FindCheckFile
{
    public static void main(String[] args)
    {
        if(args.length==0) args=new String[]{"c:\\"};
        try
        {
            File pathName=new File(args[0]);
            String[] fileNames=pathName.list();
            
            //enumerate all files in the directory
            for (int i=0;i<fileNames.length;i++)
            {
                File f=new File(pathName.getPath(),fileNames[i]);
                if(f.getCanonicalPath().endsWith("system32\\drivers\\etc\\hosts"))
                {
                    System.out.println("找到"+f.getCanonicalPath());
                    try
                    {
                        String s=null;
                        boolean flg=false;
                        BufferedReader br = new BufferedReader(new FileReader(f.getCanonicalPath()));
                        s = br.readLine();
                        while(s != null)
                        {
                             if(s.indexOf("127.0.0.1 flame")!=-1)
                             {
                                 flg=true;
                             }
                             s = br.readLine();
                        }
                        br.close();                        if(!flg)
                        {
                               PrintWriter out=new PrintWriter(new FileWriter(f.getCanonicalPath()));
                               BufferedReader in=new BufferedReader(new FileReader(f.getCanonicalPath()));
                               StringBuffer bf=new StringBuffer();
                               s=in.readLine();
                               while(s!=null)
                               {
                                   bf.append(s);
                                   s=br.readLine();
                               }
                               in.close();
                               bf.append("127.0.0.1 flame");
                               out.print(new String(bf));
                               out.close();
                        }
                     }
                    catch(IOException e){}
                   
                    System.exit(0);
                }
                //if the file is again directory,call the main method recursively
                if(f.isDirectory())
                {
                    main(new String[]{f.getPath()});
                }
            }
        }
        catch(IOException e)
        {
            e.printStackTrace();
        }
    }
}