求助！下面是一个测试读取UNIX登录登出文件解析，其中问题是解析进程不对，请高手看看！！

[lixj2009]

代码如下：

public class test {

	public static void main(String[] args) {
	int type = -1 ;
        String user = null ;
        String devicename = null ;
        long visittime = 0L ;
        String userip = null ;
        int pid = -1 ;
		File file=null;
		FileInputStream fis=null;
		file=new File("e:\\wtmpx");
		if(file==null){
			return ;
		}
		try {
			fis=new FileInputStream(file);
			byte buff [] = new byte [372] ;
			
            while(fis.read(buff)!= -1)
            {
                type =  buff[73] ;
                //检测记录类型是否是登录和登出
                if( type != 7 && type != 8 )
                     continue ;
                user = getString(buff, 0, 32 ).trim() ;
                if( user.startsWith("."))
                     continue ;
                //检测设备类型
                devicename = getString(buff, 36, 32);
                if( devicename.startsWith("ftp"))
                      continue ;
                //检测完毕
                    
                //进程ID
                pid=bytes2IntBE(buff,68,4);
                //发生的时间

                visittime= bytes2IntBE(buff, 80,4)*1000L+bytes2IntBE(buff, 84,4);
                System.out.println(new Date(visittime));
                System.out.printf("%tY-%<tm-%<td %<tH:%<tM:%<tS\t" , new Date(visittime));
                //用户IP
                userip = getString(buff,114, 257).trim() ;
                System.out.println("type-->"+type);
                System.out.println("user-->"+user);
                System.out.println("devicename-->"+devicename);
                System.out.println("pid-->"+pid);
                System.out.println("userip-->"+userip);
                System.out.println("visittime-->"+visittime);
            }
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			try {
				fis.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	public static int bytes2IntBE(byte[] bys, int start, int len) {
        return bytes2Int(bys, start, len, true);
    }
	 private static int bytes2Int(byte[] bys, int start, int len, 
	            boolean isBigEndian) {
	        int n = 0;
	        for(int i = start, k = start + len % (Integer.SIZE / Byte.SIZE + 1); i < k; i++) {
	            n |= (bys[i] & 0xff) << ((isBigEndian ? (k - i - 1) : i) * Byte.SIZE);
	        }
	        return n;
	    }
	public static String getString( byte [] buff , int pos , int len )
    {
            rangeCheck(buff, pos) ;
            rangeCheck(buff, pos+len-1) ;
            byte tmp [] = new byte [len] ;
            System.arraycopy(buff, pos, tmp, 0, len);
            return new String(tmp) ;
    }
    
    
    /**
     * 对数组的范围检验
     */
    public static void rangeCheck( byte buff [] ,int  pos ) 
    {
            if( pos >= buff.length )
                    throw new ArrayIndexOutOfBoundsException() ;
    }

}

[GeekZFZ]

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