请高手赐教，关于java date与win32 filetime格式之间的转换

Calendar c1601=Calendar.getInstance();

    	c1601.set(Calendar.YEAR, 1601);

    	c1601.set(Calendar.MONTH, Calendar.JANUARY);

    	c1601.set(Calendar.DAY_OF_MONTH, 1);

    	c1601.set(Calendar.HOUR, 0);

    	c1601.set(Calendar.MINUTE, 0);

    	c1601.set(Calendar.SECOND, 0);

    	c1601.set(Calendar.MILLISECOND, 0);

    	long interval=0-c1601.getTimeInMillis();//1601的毫秒数，因为早于1970，因此是个负数，用0减得正数

    	

    	long time1= 30089218l<<32;

    	time1+=1907785472l;//高低位合并，得到自1601年以来的"100纳秒"数

    	time1/=10000;//得到毫秒

    	Date d=new Date(time1-interval);//interval是1601-1970年之间的毫秒数

    	System.out.println(d);

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

public class Test4 {

    

    public static void main(String[] args) throws ParseException {        

        

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        

        Date date1 = sdf.parse("2010-07-10 07:35:18");

        

        FileTime fileTime = FileTime.date2FileTime(date1);

        System.out.println(fileTime.toString());

        

        FileTime file = new FileTime();

        file.setHigh(30089218);

        file.setLow(1907785472);

        Date date2 = FileTime.fileTime2Date(file);

        System.out.println(sdf.format(date2));

    }    

}



class FileTime {

    

    /**

     * Unix 时间 1970-01-01 00:00:00 与 Win32 FileTime 时间 1601-01-01 00:00:00

     * 毫秒数差 

     */

    public final static long UNIX_FILETIME_DIFF = 11644473600000L;

    

    /**

     * Win32 FileTime 采用 100ns 为单位的，定义 100ns 与 1ms 的倍率

     */

    public final static int MILLISECOND_MULTIPLE = 10000;

    

    private int low;

    private int high;

    

    public FileTime() {

        

    }

    

    public FileTime(int low, int high) {

        this.low = low;

        this.high = high;

    }

    

    /**

     * 将 Win32 的 FileTime 结构转为 Java 中的 Date 类型

     * @param fileTime

     * @return

     */

    public static Date fileTime2Date(FileTime fileTime) {

        return new Date(fileTime.getFileTime() / FileTime.MILLISECOND_MULTIPLE - FileTime.UNIX_FILETIME_DIFF);

    }

    

    /**

     * 将 Java 中的 Date 类型转为 Win32 的 FileTime 结构

     * @param date

     * @return

     */

    public static FileTime date2FileTime(Date date) {

        long time = (FileTime.UNIX_FILETIME_DIFF + date.getTime()) * FileTime.MILLISECOND_MULTIPLE;

        FileTime fileTime = new FileTime();

        fileTime.setHigh((int)(time >> 32) & 0xffffffff);

        fileTime.setLow((int)time & 0xffffffff);

        return fileTime;

    }



    public int getLow() {

        return low;

    }

    public void setLow(int low) {

        this.low = low;

    }

    public int getHigh() {

        return high;

    }

    public void setHigh(int high) {

        this.high = high;

    }

    

    /**

     * 获得 FileTime 以 64 位数字表示的数据

     * @return

     */

    public long getFileTime() {

        return ((long)high << 32 & 0xffffffff) | ((long)low & 0xffffffff);

    }

    

    public String toString() {

        return "high: " + high + ", low: " + low;

    }

}

long time=(1907785472l-621355968l)*1000;

    	Date d=new Date(time);

    	System.out.println(d);