UEP-时间

时间戳转化为Date（or  String）

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

	  Long time=new Long(445555555);

	  String d = format.format(time);

	  Date date=format.parse(d);

          System.out.println("Format To String(Date):"+d);

	  System.out.println("Format To Date:"+date);

	  运行结果：

		Format To String(Date):1970-01-06 11:45:55

		Format To Date:Tue Jan 06 11:45:55 CST 1970

Date（or String）转化为时间戳

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

       String time=" 1970-01-06 11:45:55 ";//注：改正后这里前后也加了空格

       Date date = format.parse(time);

       System.out.print("Format To times:"+date.getTime());

	运行结果：

		Format To times:445555000

获取当前时间

1.通过Date类来获取时间 (常用)

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

   String str=sdf.format(new Date());

   System.out.println("当前时间是："+str);

2.通过System类中的currentTimeMillis方法来获取当前时间

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

	String str=sdf.format(System.currentTimeMillis());

	System.out.println("当前时间是："+str);

3.通过Calendar类来获取当前时间

       Calendar c = Calendar.getInstance();

	   int year = c.get(Calendar.YEAR);

	   int month = c.get(Calendar.MONTH)+1;

	   int date = c.get(Calendar.DATE);

	   int hour = c.get(Calendar.HOUR_OF_DAY);

	   int minute = c.get(Calendar.MINUTE);

	   int second = c.get(Calendar.SECOND);

	   System.out.println(year + "-" + month + "-" + date + " " +hour + ":" +minute + ":" + second);

（注意：月份从0开始所以要+1）

4. LocalDateTime类来获取当前时间

          LocalDateTime dt = LocalDateTime.now();

		  int year = dt.getYear();

		  int month = dt.getMonthValue();

		  int date =dt.getDayOfMonth();

		  int hour = dt.getHour();

		  int minute = dt.getMinute();

		  int second = dt.getSecond();

		  System.out.println(year + "/" + month + "/" + date + " " +hour + ":" +minute + ":" + second);

例子：

	public class Test {

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

		//获取当前时间

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

				   String str=sdf.format(new Date());

				   System.out.println("当前时间是："+str);

		//将Date转换成时间戳

				   Date date = sdf.parse(str);

				   System.out.print("Format To times:"+date.getTime());

		}

	}

项目中时间过滤：

    //时间过滤

		String opTime1 = this.getProperty("opTime1");//开始时间

		String opTime2 = this.getProperty("opTime2");//结束时间

		if(opTime1!=null&&!"".equals(opTime1)){

			params.addParam("fillDate",Timestamp.valueOf(opTime1),QueryParam.RELATION_GE);

		}

		if(opTime2!=null&&!"".equals(opTime2)){

			Timestamp endDate = CommonUtil.addDay(Timestamp.valueOf(opTime2), 1);

			params.addParam("fillDate",endDate,QueryParam.RELATION_LE);

		}

   //时间排序

		SortParamList sortParamList =new SortParamList();

		sortParamList.addParam("fillDate", SortParam.SORT_TYPE_DESCENDING);

   //Jsp

		<td width="60" align="right">会议时间</td>

		<td width="180" align="left"><hy:date id="wzModel" upload="true"  cssStyle="width:100%;height:18px"  editor="date"/></td>

		<td width="40" align="right">到</td>

		<td align="left" width="15%"><hy:date id="_fillDate2" editor="date" cssStyle="width:100%"upload="true" />

	　　　　 知识点：editor 日期格式：month—年月,date--年月日,datetime-年月日时分秒，默认为date