temp2.java

这是一个URL检索的算法

import java.io.*;
public class temp2
{
	
public static void main(String []args)
{	
 int length=1;
 char cbuf[]=new char[length];
 temp2 Temp2=new temp2();
 char c2=Temp2.test(1,10);
 int n2=(int)c2;
 System.out.println(n2);
 
 c2=Temp2.test(2,6);
 c2=Temp2.test(2,5);
 c2=Temp2.test(2,0);
 
 cbuf=Temp2.read("D:\\download\\hashtempFile3.txt",2,length);
 
 for(int i=0;i<length;i++)
 {System.out.print("this is "+cbuf[i]+"  ");}
 System.out.println();
  
  long start=System.currentTimeMillis();
  try
  {
  RandomAccessFile f3=new RandomAccessFile("D:\\download\\hashtempFile1.txt","rw");  
  f3.seek((long)Math.pow(2,28));
  char tt=f3.readChar();
  f3.close();
}
 catch(IOException e) {System.out.println(e);}
  System.out.println("time had "+(System.currentTimeMillis()-start));
  
  
  
  }
  
  
  
  
  
  
  char[] read(String s,int offset,int length)
  {
  	char buf[]=new char[length];
  	int temp;
    

    try{

    RandomAccessFile f=new RandomAccessFile(s,"rw");
    temp=offset*2;
    
    for(int i=0;i<length;i++)
    { f.seek(temp);  
      buf[i]=f.readChar();    
      temp=temp+2;
    }
    
     
	f.close(); 
	 }
	catch(IOException e)			{System.out.println(e);}
	
	return buf;
}//end test

 
 
 char test(int m1,int m2)
  {
  	char buf=0,temp;
    

    try{

    RandomAccessFile f=new RandomAccessFile("D:\\download\\hashtempFile3.txt","rw");
    //RandomAccessFile f1=new RandomAccessFile("D:\\download\\hashtempFile2.txt","rw");
	System.out.println("this is "+f.length());
	        
    f.seek(m1*2);
    buf=f.readChar();    
    temp=buf;
    
    if (((temp>>m2)&0x01)==1)  System.out.println("this has had");
    else {System.out.println("not have");
          buf=(char)(buf|(1<<m2));
          f.seek(m1*2);
          f.writeChar(buf);
           }//endif 
    
     
	f.close(); 
	 }
	catch(IOException e)			{System.out.println(e);}
	
	return buf;
}



}//end class