java 读入nmn格式文件

   我看了网上别人用C写的读nmn股票5分钟历史数据的程序。Google了一把，没有java

的版本。就想试一下，原以为很简单，结果折腾了半天才完成。希望对想用java程序读相关

数据的有点帮助。

import java.io.*;
import java.util.*;
public class nmnread{

public static void main(String args[]) throws IOException
{
   
    String filename = args[0];
    int len  =  40;
    byte[] bytes = new byte[len];
       
    BufferedInputStream bis=new BufferedInputStream(new FileInputStream(filename));
   
    while (bis.available() != 0) {
    
       bis.read(bytes,0,len);
       
       ByteArrayInputStream bytestream = new ByteArrayInputStream(bytes);
   DataInputStream is = new DataInputStream(bytestream);

       int  i1 = is.readUnsignedByte();       
       int  i2 = is.readUnsignedByte();        
       int  i3 = is.readUnsignedByte();        
       int  i4 = is.readUnsignedByte();      
     int   uTime =(((int)(i4&0xff)<<24)|((int)(i3&0xff)<<16)|((int)(i2&0xff)<<8)|((int)(i1&0xff)<<0));
      
       int uYear = (( uTime&0xFFF00000)>>20)&0x00000FFF;//右移20位
       int uMonth = ( ( uTime<<12)>>28)&0x0000000F;//先左移12位再右移28位
       int uDate = ( ( uTime<<16)>>27)&0x0000001F;
       int uHour = ( ( uTime<<21)>>27)&0x0000001F;
       int uMinute = ( ( uTime<<26)>>26)&0x0000003F;

      
       i1 = is.readUnsignedByte();       
       i2 = is.readUnsignedByte();        
       i3 = is.readUnsignedByte();        
       i4 = is.readUnsignedByte();                
       float dOpen   =  (float)( ((i4&0xff)<<24) | ((i3&0xff) <<16 ) |( (i2&0xff)<<8 )|(i1&0xff) )/1000; 
      
       i1 = is.readUnsignedByte();     
       i2 = is.readUnsignedByte();     
       i3 = is.readUnsignedByte();     
       i4 = is.readUnsignedByte();     
       float dHigh   =  (float)( ((i4&0xff)<<24) | ((i3&0xff) <<16 ) |( (i2&0xff)<<8 )|(i1&0xff) )/1000;
      
       i1 = is.readUnsignedByte();     
       i2 = is.readUnsignedByte();     
       i3 = is.readUnsignedByte();     
       i4 = is.readUnsignedByte();     
       float dLow    =  (float)( ((i4&0xff)<<24) | ((i3&0xff) <<16 ) |( (i2&0xff)<<8 )|(i1&0xff) )/1000;
      
       i1 = is.readUnsignedByte();     
       i2 = is.readUnsignedByte();     
       i3 = is.readUnsignedByte();     
       i4 = is.readUnsignedByte();           
       float dClose  =  (float)( ((i4&0xff)<<24) | ((i3&0xff) <<16 ) |( (i2&0xff)<<8 )|(i1&0xff) )/1000;
      
       i1 = is.readUnsignedByte();     
       i2 = is.readUnsignedByte();     
       i3 = is.readUnsignedByte();     
       i4 = is.readUnsignedByte();     
       float dAmount =  (float)( ((i4&0xff)<<24) | ((i3&0xff) <<16 ) |( (i2&0xff)<<8 )|(i1&0xff) )/1000;
      
      
       i1 = is.readUnsignedByte();     
       i2 = is.readUnsignedByte();     
       i3 = is.readUnsignedByte();     
       i4 = is.readUnsignedByte();     
       float dVolume =  (float)( ((i4&0xff)<<24) | ((i3&0xff) <<16 ) |( (i2&0xff)<<8 )|(i1&0xff) )/1000;
    
       System.out.println( uYear+"-"+uMonth+"-"+uDate+" "+uHour+":"+uMinute+"\t"+dOpen+"\t"+dHigh+"\t"+dLow+"\t"+dClose+"\t"+dAmount+"\t"+dVolume );
    }
    bis.close();
}
}