java 파일 읽고 쓰기

package reader;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Calendar;
import java.util.Vector;

public class LogFileIO { 
 
 public LogFileIO(){ 

 }
 
 public String fileNameCheck( String str ) {
  
  String temp = "";
  
  int i = str.length();
  
  temp = str.substring( i-4, i );
  
  return temp;
 }

 /********logFile에 리스트*********************************************/
 public Vector fileList( String directory ){
  
  Vector vec = new Vector();
     
  File myDir = new File( directory );
  File[] contents = myDir.listFiles();
    
  for(int i=0; i
   
   String temp = fileNameCheck( contents[i].toString().toLowerCase() );
   
   if( temp.equals( ".txt" )){
    vec.add( contents[i].getName() );
   } 
  }
  
  return vec;
 }
 /*****************************************************************/
 
 /********logFile파일 만들기******************************************/
 public void fileWrite( String directory, String str ){
    
  File file = new File( directory + fileName() );
  
  java.io.FileOutputStream writer;
  java.io.RandomAccessFile raf = null;
  
  try{

   String strLine = ""; 
   
   raf = new java.io.RandomAccessFile(file, "rw");
   raf.seek(raf.length());
   
   writer = new java.io.FileOutputStream(raf.getFD());
   
   strLine = new String( str +"\r\n" );
   writer.write(strLine.getBytes());
   raf.close();
   
  }catch( Exception e ){
   e.printStackTrace();
  }
   
 }
 /*****************************************************************/
 
 /*******logFile불러오기*********************************************/
 public String loadFile( String directory, String filename) {
  
  //Vector vec = new Vector();
  
  StringBuffer buffer = new StringBuffer();
  BufferedReader in = null;
  
  //LogfileData logFileData = new LogfileData();

  try { 
   in = new BufferedReader(new FileReader( directory + filename),1024);  
   String str=null;
   
   while ((str=in.readLine()) != null){
    
    buffer.append( str +"\r\n" );
   // LogFile file = logFileData.logFile( str );
    
   // vec.add( file );

   } 
  
   in.close();

  }catch (IOException ie){
   System.err.println("File Read Error : "+ie.getMessage()); 
  }
  
  return buffer.toString();
 } 
 /*****************************************************************/
 
 /*******현재 시간 나타내기******************************************/
 public String nowTime(){
  
  String temp = "";
  
  Calendar calender;
  
  String year, month, date, hour, minute, sec;
 
  calender = Calendar.getInstance();
  
  calender.get(Calendar.AM_PM);
  
  year = String.valueOf( calender.get(Calendar.YEAR) );  
  month = String.valueOf( calender.get(Calendar.MONTH) + 1 );
  date = String.valueOf( calender.get(Calendar.DATE) );
  hour = String.valueOf( calender.get(Calendar.HOUR_OF_DAY) );
  minute = String.valueOf( calender.get(Calendar.MINUTE) );
  sec = String.valueOf( calender.get(Calendar.SECOND) );
  
  
  temp =  year + "년" + month + "월" + date + "일" + hour + "시" + minute + "분" + sec +"초";
  
  return temp;
         
 }
 /*****************************************************************/
 
 public String fileName(){
  
  String temp = "";
  
  Calendar calender;
  
  String year, month, date;
  
  calender = Calendar.getInstance();
  year = String.valueOf( calender.get(Calendar.YEAR) );  
  month = String.valueOf( calender.get(Calendar.MONTH) + 1 );
  date = String.valueOf( calender.get(Calendar.DATE) );
  
  temp = year + "년" + month + "월" + date + "일.txt";
  
  return temp;
 }
 
 public static void main( String[] args ){
  new LogFileIO();
 }
}