io相关

File(\".\");//获取当前文件
.getAbsolutePath//获得文件绝对路径
.length//获得文件长度
.list//取得文件list是个
.exists//文件存在
.isFile//文件是文件
.isDirectory//文件是目录
/**文件名过滤器*/
Filter implements FilenameFilter
{
 String canShu;
 Filter ( String canShu )
 {
  this.canShu = canShu ;
 }
 public boolean accept ( File dir ,String name)
 {
   name.endsWith(\".\"+canShu );
 }
}
/**随机文件创建并写入内容操作*/
void CreateFile(RandomAccessFile rafFile)
{
 long lngNumbers = { 10001L,10002L,10003L,10004L,10005L };
 String strNames = { \"zhang san\",\"li si\",\"wang wu\",\"zhao liu\",\"qian qi\" };
  Age = { 20,21,26,18,30 };
 try
 {
  for ( i =0 ; i < lngNumbers.length ; i )
  {
   rafFile.writeLong(lngNumbers[i]);
   rafFile.writeChar(\'\\t\');
   rafFile.writeInt(Age[i]);
   rafFile.writeChar(\'\\t\');
   rafFile.writeBytes(strNames[i]+\"\\n\");
  }
 }catch(IOException e)
 {
  .out.prln (\" File Access Error ！\"+e);
 }
}
/**输出文件内容*/
void OutputFile(RandomAccessFile rafFile)
{
 try
 {
  .out.prln(\"显示文件内容:\"); 
  rafFile.seek(0);
  while (true)
  {
   long lngNumber = rafFile.readLong;
   rafFile.readChar;
    str = rafFile.readInt;
   .out.prln(lngNumber + \"\\t\" + str + \"\\t\" + rafFile.readLine);
  }
 }
 catch(EOFException e)
 {
  .out.prln (\"Reach the end of the file ! \"+e);
 }
 catch(IOException e)
 {
  .out.prln (\" File Access Error ！\"+e);
 }
}

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