Date 与 Calendar 计算时间及天数
有时我们会比较时间，例如：7天前，7天后。虽然是基础，但好久没写基层代码了，今天贴一个demo.
1：方案1
Calendar c = Calendar.getInstance();int year = c.get(Calendar.YEAR);int month = c.get(Calendar.MONTH)+1;int date = c.get(Calendar.DATE);int num = c.get(Calendar.DAY_OF_YEAR);System.out.println(year +"_"+ month+"_"+date+"是今年的第"+num+"天");Calendar cal = new GregorianCalendar();String a = "2011-03-02 10:11:52";SimpleDateFormatsf = new SimpleDateFormat("yyyy-MM-dd mm:hh:ss");Date d;try {d = sf.parse(a);cal.setTime(d);} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();}int year1 = cal.get(Calendar.YEAR);int month1 = cal.get(Calendar.MONTH)+1;int date1 = cal.get(Calendar.DATE);int num1 = cal.get(Calendar.DAY_OF_YEAR);System.out.println(year1 +"_"+ month1+"_"+date1+"是今年的第"+num1+"天");
2：方案2:
int failLoginInterval = 60*60*1000; //1小时Date dt = new Date();long lastDay = dt.getTime();long tmp = lastDay - (failLoginInterval*24*7);System.out.println("今天是："+lastDay);System.out.println("7天是："+failLoginInterval*24*7);System.out.println("七天前："+tmp);
会话不多说了。此处贴代码，由于时间有限。
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