将日期对象转为毫秒值
1）用Date的的getTime方法
Date date = new Date(0);
long time = date .getTime();
System.out.print.ln(time);
2）使用System.currentTimeMillis()
long time =System.currentTimeMillis();
System.out.print.ln(time);

将日期对象转为毫秒值
1）用Date的的getTime方法
Date date = new Date(0);
long time = date .getTime();
System.out.print.ln(time);
2）使用System.currentTimeMillis()
long time =System.currentTimeMillis();
System.out.print.ln(time);