计算机科学论坛--找个能人帮忙解决一些这个问题，谢谢

贴子主题：找个能人帮忙解决一些这个问题，谢谢

本主题类别:

这是一段代码，可是在运行的时候老是提示又这个问题：xception in thread "main" java.io.FileNotFoundException: C:\Documents and Settings (拒绝访问。)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at stream.FileInputStreamDemo.main(FileInputStreamDemo.java:9)
实在不明白是怎么回事了，难道是我输入流的读数据函数写错了么，初学，不明白，那位帮忙说说，谢谢先！
package stream;
import java.io.*;

public class FileInputStreamDemo {
public static void main(String args[])throws IOException{
  String dir="C:/Documents and Settings";
  File file=new File(dir);
  if(file.exists()){
   FileInputStream f=new FileInputStream(file);
   DataInputStream in = new DataInputStream(f
     );
   int fsize=f.available();
   System.out.println("Total available bytes:"+fsize);
   int n=fsize/40;
   System.out.println("Reading first "+n+" bytes one at a time");
   for(int i=0;i<n;i++){
    System.out.println((char)f.read());
   }
   int temp=f.available()-n;
   System.out.println("\nstill available:"+temp);
   System.out.println("reading rhe next "+n+" bytes");
   byte []b=new byte[n];
   if(in.read(b)!=n){
    System.err.println("can't read"+n+"bytes");
   }
   System.out.println(new String(b,0,n));
   fsize=f.available();
   System.out.println("\nstill available:"+fsize);
   System.out.println("skiping half of remaining bytes");
   f.skip(fsize/2);
   System.out.println("\nstill available:"+fsize);
   System.out.println("reading  "+n/2+" into the end of array");
   if(in.read(b,n/2,n/2)!=n/2){
    System.err.println("couldn't read"+n/2+"bytes");
   }
   System.out.println(new String(b,0,b.length));
   System.out.println("\nstill available:"+f.available());
  }else{
   System.out.println("Directory "+dir+" is not exist!");
  }

}
}


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